Re: [RE-wrenches] Remote battery disconnects
On 2/1/2023 2:58 PM, Starlight via RE-wrenches wrote: Have you (or any) installed surge suppression on the PV input side to clamp the open circuit voltage surge? That's not where the issue is and isn't really a solution. As I explained in my previous e-mail, the issue is the open circuit on the output leaves no where for the energy in the MPPT controllers inductor to go and the only option is for the voltage to rise until it finds somewhere to go. Surge suppressors, such as sold by Midnite Solar, are nothing more than Metal Oxide Varistors. Or in the case of Delta, they are pieces of wire in sand. They require large rise in voltage before they conduct. MOVs are sometimes found on the battery side of inverters and charge controllers, but their clamp time and voltage before clamping requires additional circuitry that works faster to protect fragile semiconductors. If you are proposing using a surge supressor to regulate the voltage of an island between a charge controller and an inverter when the battery is disconnected, that's also a no go. Once the MOV clamps, it stays clamped until voltage goes essentially to zero or until it blows up. It's not a regulator. - To further stir the pot, it is definitely possible to design electronics that can deal with load dumps and survive most anything. Aerospace electronics come pretty close. But all that costs money and takes space to do. Are we comfortable with requiring $16,000 charge controllers so they can handle load dumps reliably from a poorly thought out NEC requirement? I think the fossil fuel industry would be very happy with the cost of renewable energy electronics being an order of magnitude more expensive. Larry Crutcher Starlight Solar Power Systems On Feb 1, 2023, at 1:23 PM, William Bryce via RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org>> wrote: I can also backup what Jim has said, and have seen the same gear destroyed by removing the battery abruptly when the controller is under heavy load. They can die, and sometimes die spectacularly. Have seen SolArk inverters integrated MPPT controllers blow up when lithium battery BMS disconnects. Not a field fixable issue. Just flip off the breaker when the solar is working hard and and the SolArk will give up the smoke. Like I originally said, it’s the non talked about issue that is a big issue depending on what gear your using. On Wed, Feb 1, 2023 at 2:49 PM James Jefferson Jarvis via RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org>> wrote: On 2/1/2023 12:25 PM, Alex MeVay via RE-wrenches wrote: > Although our controllers are probably smaller than what you would be > considering in this discussion, surviving a load dump (suddenly > disconnected battery) is an engineering requirement for us, and likely > would be for other responsible MFG's on this list (boB?). The charge > controller can either handle full input voltage on the output, or > there is a comparator that will shut the controller down instantly > when the output voltage gets too high. So that's part of the picture. The other part of the picture is the rest of the system. The discussion and what NEC is mandating is that the battery be disconnected. As far as I can tell, there isn't an explicit requirement in all cases that all of the power inputs into the system are all going to go away at exactly the same time or ever. This leaves things like charge controllers getting input power potentially from PV or wind or grid or generator or something else. And nothing in the NEC, as far as I can tell, is mandating that all of the DC loads be disconnected. So the loads are online. Now the regulation circuit (switching power supply in the case of a MPPT controller) is regulating variable loads and nothing is providing substantial resistance to change. Normally the battery is acting like a very very very big capacitor. But without the battery, there isn't enough damping in the control loops and voltage stability will suffer. This is where you get 250 volts on your normally 48 volt battery bus. Or 3 volts. Or -80 volts. Or all of those in a fraction of second. This sort of thing is hard on electronics and will cause failures. Alex's comment about Genasun's controllers handling full input voltage on the output is probably unique to their niche product. Looking at their biggest controller, it appears to support VOC of 34 volts. At 34 volts, he can use 50V or 100V rated components on his output. For a 150V input controller, you probably can. But you wouldn't because it would be too expensive. But on a 600V or 1000V controller, there's just no way that you do that because 1000V rated components are big and expensive
Re: [RE-wrenches] Remote battery disconnects
On 2/1/2023 12:25 PM, Alex MeVay via RE-wrenches wrote: Although our controllers are probably smaller than what you would be considering in this discussion, surviving a load dump (suddenly disconnected battery) is an engineering requirement for us, and likely would be for other responsible MFG's on this list (boB?). The charge controller can either handle full input voltage on the output, or there is a comparator that will shut the controller down instantly when the output voltage gets too high. So that's part of the picture. The other part of the picture is the rest of the system. The discussion and what NEC is mandating is that the battery be disconnected. As far as I can tell, there isn't an explicit requirement in all cases that all of the power inputs into the system are all going to go away at exactly the same time or ever. This leaves things like charge controllers getting input power potentially from PV or wind or grid or generator or something else. And nothing in the NEC, as far as I can tell, is mandating that all of the DC loads be disconnected. So the loads are online. Now the regulation circuit (switching power supply in the case of a MPPT controller) is regulating variable loads and nothing is providing substantial resistance to change. Normally the battery is acting like a very very very big capacitor. But without the battery, there isn't enough damping in the control loops and voltage stability will suffer. This is where you get 250 volts on your normally 48 volt battery bus. Or 3 volts. Or -80 volts. Or all of those in a fraction of second. This sort of thing is hard on electronics and will cause failures. Alex's comment about Genasun's controllers handling full input voltage on the output is probably unique to their niche product. Looking at their biggest controller, it appears to support VOC of 34 volts. At 34 volts, he can use 50V or 100V rated components on his output. For a 150V input controller, you probably can. But you wouldn't because it would be too expensive. But on a 600V or 1000V controller, there's just no way that you do that because 1000V rated components are big and expensive and their spacing requirements are huge compared 100V level sort of stuff. So the way bigger MPPT controllers deal with load dump is with transient voltage supression or other diodes to handle the voltage spike caused by the inductor when the load goes away. When operated in parameters, these parts don't wear out. But it can be interesting to size them adequately to account for inductance elsewhere in the system adding to voltage and energy that has to be absorbed. There is a very simple experiment that anybody can perform to see how equipment handles a load dump: Simply wait for a sunny day and turn off the battery breaker. If no magic smoke was released, turn back on battery breaker. If still no magic smoke was released, then great, your system survived a load dump. If you are at all uncomfortable doing this and/or your system gets destroyed in the process, think back to my earlier security comments about having a self destruct switch on the outside of your building allowing anyone walking by to do this experiment for you. I have personally destroyed Outback, Midnite, and Morningstar controllers inadvertently or intentionally doing load dumps by shutting off their output breaker. Typically the TVS diodes short out and secondary over current protection (circuit breaker) trips before things catch on fire. Usuaully the UL94V0 rating on the circuit board and the box the circuit board is in prevents fire from spreading when things do get wild. But I've also seen all of those brands survive a load dump. I have multiple customer who have fielded lithium battery systems to cold locations and have had battery BMS disconnect the battery from the rest of the system. Ten's of thousands of dollars of equipment has been destroyed in these islanding events. Some thoughts, for what they are worth. -James Jarvis APRS World, LLC ___ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
Re: [RE-wrenches] Supply side denial
Hopefully Wisconsin is better than Minnesota about this. As a former Wisconsin resident, I doubt it...but here is how some of this works in Minnesota, lest you have any illusion that a PSC or a state cares about you. In Minnesota the state allows the utility to essentially make any interconnection rules they want. Our local cooperative requires that you install a meter socket for a production only meter. And then buy the meter from them. The first time I got bit by this was after they had charged us hundreds of dollars to have an engineer review our plans, got approval, installed the system, and then they asked where the production only meter was. I said it wasn't on the plans their engineer approved and they said they didn't care and they wouldn't interconnect until that meter was there. Ended up having to rework a bunch and cost well over a $1,000 to get added. Another game they play is skirting the 40kW state law guaranteed net metering cap. The same cooperative requires demand metering if your transformer is larger than 37.5 kVA. And their demand meter doesn't take into account direction. So if you are supplying them 40kW that counts as 40kW of demand and *costs* $400 a month for demand charges. So you can really only connect 37.5 kW. I attempted to make a complaint on both of these occasions to the state Public Utilities Commission. And found out that they don't regulate cooperatives. Apparently the state feels that since cooperatives are owned by members, they don't need any oversight. They told me that I could just run to be on the cooperative board. Which I decided to do. Then came to find out that the 60k member cooperative suspended board elections for 5 years due to a merger. -James Jarvis APRS World, LLC On 10/28/2020 5:47 AM, Christopher Warfel wrote: I would think that would be illegal. They don't have jurisdiction on supply side taps. It's past the meter, and expressly allowed in the NEC. I would definitely first ask to talk to a higher level person than the one denying it (paper trail important). If that does not work, then the PSC is your best option. Chris On 10/27/2020 6:27 PM, Kristopher Schmid wrote: Hi All, I have a utility that is hinting that they are going to deny my interconnection application with a supply side connection and require a load side. Has anyone seen this before? (Proposed interconnection would be with Milbank step lugs in a 200 A socket and a 60 A fused disconnect within 10 feet.) If they refuse it, i am thinking that registering a complaint with the Wisconsin PSC may be appropriate. Kris Shine On! Kris Schmid Legacy Solar, LLC 137 West 1st Avenue Luck, WI 54853 www.legacysolar.com <http://www.legacysolar.com> 715-653-4295 NABCEP Certified PV Installation Professional Licensed Wisconsin Master Electrician BSEE ___ List sponsored by Redwood Alliance List Address:RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org -- -James Jefferson Jarvis j...@aprsworld.com +1-507-454-2727 ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
Re: [RE-wrenches] advice on cellular modem brands
The non-consumer grade units will have wired ethernet ports. My favorite is the Sierra Wireless RV50X. It is rock solid stable and uses less than 1 watt of power. https://www.sierrawireless.com/products-and-solutions/routers-gateways/rv50/ The problem I have run into with the JetPacks and the like is that they are consumer orientated and expect to have somebody there to poke and prod them when required. I had a 450 mile service trip to an island so I could press "okay" on the screen to acknowledge that it had updated. Then it returned back to normal service. For another customer, a cell phone company at their cell tower, they suggested that we hard cycle the power every 24 hours to prevent crashes. Why don't OEMs include WiFi? It's a support nightmare. You either need another screen on the device just to setup WiFi or you need convoluted instructions and apps for both iPhone and Android. And then it works fine until somebody changes the wireless credentials and then its back to the convoluted setup again. -James Jarvis APRS World, LLC On 4/11/20 3:08 PM, Kirk Herander wrote: Just did the exact same thing using a Verizion Jetpack. Works quite well transmitting both Mate3s and Blue Ion egauge data simultaneously. Trouble is it does not have a LAN port, wifi only, so I had to use a Netgear wall repeater with a port, along with an ethernet switch to plug everything into. And I could use any pointers on how to create the LAN port with less hassle. I don't know of any Verizon-compatible modem with a built-in LAN port. Also why doesn't the Mate3s and other OEMs use wifi in their products? Very few do. It is 2020 after all. ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Radian orders hardware problems
Deltec makes the good shunts. http://deltecco.com/ That series of shunt is pretty cheap in small quantities. Less than $30. Empro is another US shunt manufacturer: http://www.emproshunts.com/home.aspx On 12/4/2018 1:39 PM, William Miller wrote: When you are aligning negative busses to bolt them to bottom of inverter, be very careful if you need to move the bars to align with holes. It is real easy to fracture the sub-standard shunt bases. See attached photo comparing the kind of shunt you want versus what Outback ships. I am looking for a source for the sold-base units. Anyone know for sure where to find the good ones? -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Trace Replacement?
Magnum has had online monitoring for many years now. I believe it was way before Outback and Xantrex. Here is one of my sites in Fairbanks, Alaska: http://data.magnumenergy.com/MW5009/ -James Jarvis On 10/8/2018 9:23 AM, Dave Angelini Offgrid Solar wrote: I just use Outback and Schneider because their systems have web portals that I can monitor, troubleshoot, and advise on. I have never seen anything decent monitor wise from Magnum. Until 5 years ago they did not have a charge controller. If I am wrong about Magnum please post a link as I do not want to post false information. Thx. ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Xfmr's job?
On 5/31/2018 7:09 AM, Drake wrote: That is interesting about Magnum: Tech support told me that the 4024PAE was two separate 2000 W inverters. We had problems with a microwave shutting the system down. That's interesting. I lived off grid for 7 years with a single MS4024PAE. I had one overload shut down in all that time. Microwave (1200 watts @ 120) + well pump (1700 watts @ 240) + vacuum cleaner (1400 watts @ 120) + house loads (200 watts @ 120) + I'm guessing fridge compressor kicked in (600 watts? @ 120). Never had any issues with air compressors, shop tools, 240 volt MIG welder, or anything else. Do you find you have good reliability with Magnum products? I have never had a failure with any MS inverter or ARC or AGS that I've installed. I had one BMK fail after 5 years, but that was during a lightning storm. -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Mounting on rock
On 04/12/2018 08:53 AM, Aaron Mandelkorn wrote: Thanks all. The flange plate was what I was thinking. It may be to difficult to level a ballast mounting roof system. Engineering may be a little difficult I assume? No, engineering is easy. If it is unbroken it should be at least as strong as concrete. The epoxy in anchors will work. If the rock is not perfectly level you can do a thin concrete pad on top of the rock to make a flat spot to bolt to. Drill the anchors through the concrete leveling pad and into the rock. I love anchoring to rock. It's free and not going anywhere! -James Jarvis APRS World, LLC ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Solar Pond Aerators
US Solar Mounts in Wisconsin makes nice packaged systems. https://www.ussolarmounts.us/resources/benefits-of-aeration/ -James Jarvis APRS World, LLC +1-507-454-2727 http://www.aprsworld.com/ On Tue, Apr 3, 2018 at 11:11 AM, Dana wrote: > An internet search of “solar pond aeration” turned up a variety of options. > > I was trying to find the company I had used for new installs in CO and > repair of existing systems but did not locate that company. > > > > > > > Dana Orzel Great Solar Works, Inc. > > *C - 208.721.7003 d...@solarwork.com > * > > Idaho Contractor - # 028765 Idaho PV # 028374 > > NABCEP # 051112-136 www.solarwork.biz > > *"Responsible Technologies for Responsible People since 1988" * > > *P* Please consider the environment before printing this email. > > > > > > *From:* RE-wrenches *On > Behalf Of *Drake > *Sent:* Tuesday, April 03, 2018 9:33 AM > *To:* RE-wrenches > *Subject:* [RE-wrenches] Solar Pond Aerators > > > > At one time, simple solar pond aerators were available. A small PV module > and a box with a 12 V deep cycle battery, and a pump were mounted on a > post. A hose with a weight on it went into the pond. This system seemed to > work well for small ponds. > > Does anything like this still exist? > > Thanks, > > Drake > > Drake Chamberlin > > > > > > *Athens Electric LLCOH License 44810CO License 3773NABCEP Certified Solar > PV 740-448-7328*http://athens-electric.com/ > > > ___ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Air X Turbine with Positive Ground
On 1/19/2018 4:33 PM, Ray wrote: Great, I had no idea you all added a wind turbine to your line up. I'm still waiting to hear back from Primus, but it doesn't look good. Even though they advertise it works for telecomm, another wrench contacted me privately, and said that the previous owner Southwest Wind Power told him it would NOT work with positive ground systems, which precludes most telecom. But not cool that large chunks of Midnite's specifications and marketing material for their Diversion Load are verbatim copy and pastes from my company's DL300 that we have been producing since 2008. Midnite's manual: http://www.midnitesolar.com/pdfs/CHINOOK200_DIVERSION_LOAD_MANUAL.pdf Our web page: http://www.aprsworld.com/dl300/ Our web page in 2010, as archived by the Internet Archive: https://web.archive.org/web/20100720004704/http://aprsworld.com/dl300/ Second source, clone, or compatible products are common in industry. But usually the cloner doesn't use the exact same words and formats and order when they make their datasheet. I guess since boB is plugging his wind turbine on re-wrenches, I'll also mention that APRS World's WT10 and WT14 and HR3 wind turbines will work with positive ground systems: http://www-dev.aprsworld.com/wtaprs/ Thanks, -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Concorde Lifeline Battery failures
As far as I know, they are the same battery with different label. -James Jarvis APRS World, LLC +1-507-454-2727 http://www.aprsworld.com/ On Fri, Jan 19, 2018 at 10:10 AM, Glenn Burt wrote: > So the Lifeline models, not the SunXtender models? > > ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Off grid DC Loads: DC Converter
On 1/18/2018 10:18 AM, Drake wrote: A Concorde AGM PVX 3050T recently failed in a bank of 8. Larry mentioned a couple of brands experiencing problems. These batteries are 4 years old and have been kept in float in an off grid system, never stressed. Hopefully Concorde batteries are not going the way of Trojan L-16s. Has anyone else had problems with Concorde? About three or four years ago we started experiencing problems with Concorde PVX batteries. I use them in smaller systems. Typically in their range of smallest to around 200 amp/hours. Telemetry sort of applications with small wind and/or PV powering small loads. Lots of floating and generally pleasant cycles. Problems: Leaking battery terminals when batteries are laid on their sides. Low capacity. Not testing at anywhere near their rated capacity after just a few cycles. Dead on arrival, even with current date code. Seemingly high self discharged. Full charged battery reading 10.5 volts after 6 weeks of storage. I had a rash of these sort of problems. Perhaps 10 batteries out of 30 over the course of a year. The distributor was pleasant and replaced batteries at no charge. But I decided the Concorde batteries didn't seem to be acting as premium as they used to. So I switched to bog standard AGM batteries for most small applications. Universal Battery and PowerSonic and our battery distributor's house brand of Chinese batteries. Tried some Full River batteries last year and they seem to be doing fine. The funny thing is I have small systems from early 2000's still running on their original PVX batteries. But I don't feel that would be possible with the batteries I was getting when I finally gave up. -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Off grid DC Loads: DC Converter
Mean-Well DC DC converters work well. You'll find you need a handful of them. Probably some 5 volt loads. And 12 volt loads. And maybe a 19 volt. The Mean-Well SD series will adjust slightly out of their rated range. So if the specs state it will adjust down to 19 volts, you can probably get to 18. You will, of course, also need a LVD for your DC loads. 150 watts sounds like an awful lot. My off grid house with fridge, all the wall warts for various devices, TV, Amazon FireTV box, two or three ethernet switches, DSL modem, router, wireless access point, inverter idle current, all kinds of monitoring boxes, web cam, GFI and AFCI outlets, water softener, microwave, cordless phones, USB outlets, VOIP gateway, etc etc ... was about 150 watts. Maybe you can get them to turn off all of the non-essential loads. On 1/15/2018 2:32 PM, Daniel Young wrote: Hello Wrenches, I have a client that is running into an issue with his off grid system. The system is 3yrs old and they are starting to notice their AGM battery bank is loosing capacity, in reality they are noticing the generator is triggering more often. They want to try to lower the frequency of the generator triggering if possible. -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] AC Coupled Enphase
On 8/28/2017 8:44 AM, Drake wrote: Alternatively, does anyone know of reasonably priced, 2 pole solid state relays? Just use two single pole SSRs. One for each leg. There are two pole SSR, but the price is not going to be bargain basement. -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] AC lock-out
Rather than trench, you could install a whole house disconnect. I doubt it would ever be opened. Here in my part of Minnesota the utilities won't allow you to do a whole premise disconnect. The lockable solar disconnect must serve the solar only and must be located within 6' of the meter. So I've had a few occasions where the customer has had to spend thousands of extra dollars to meet that requirement. It's a pretty crazy (read: anti-renewables) requirement in this day and age. -James Jarvis APRS World, LLC William On May 2, 2017, at 7:18 AM, frenergy wrote: Especially CA wrenches, Anybody had any of their GT systems locked-out by their utility with the AC disco? I'm dealing with a utility that still insists in installing an AC disco no matter what the conditions are and in this very rural area this can mean running an extra line out to the meter/main 100+ ft from the house (distribution panel back at the house). So backhoe, labor, materials and Oops the backhoe hit a propane line. Do they actually have a box of hundreds of locks to be able to lock-out PV systems? I doubt it. Would appreciate knowing for a discussion with their engineer. Bill Feather River Solar Electric Bill Battagin, Owner 4291 Nelson St. Taylorsville, CA 95983 530.284.7849 CA Lic 874049 www.frenergy.net --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
[RE-wrenches] Deep well submersible pump query
Wrenches, I have a project that needs a deep well submersible pump. I want to find a pump that will be compatible with an off grid system, probably using a single or two in parallel Magnum MS4024PAE or MS4048PAE inverters. I usually using Grundfos SQ pumps for these applications. The soft starting SQ work wonderfully with the inverters with no brownouts during startup. But, in this case, the well is too deep for the SQ pumps. Well company is specifying 2HP, 4" diameter. Well is likely ending up 600ft deep, probably 400 to 500' deep pump, and needing to supply 10 GPM when running. Customer and I are most familiar with a standard pressure tank type system with pump turning on at low pressure and off at high pressure. Well driller, in an effort to provide system with a soft start, are encouraging a constant pressure system. I am not thrilled with the thought of the pump starting up constantly for somebody to brush their teeth or wash their. Or am I mis-understanding how constant pressure systems? Any recommendations for a 2 HP pump system that will have minimal starting surge (ie run happily on inverter power)? My brief searching shows I can do a capacitor start system (three wire, with control box on the surface) and do somewhat better than across the line starting. Or I can do a 3 phase pump and then manufacturer / pump specific VFD on the surface ... at the penalty of huge $ cost and high idle power on the VFD control (65 watts in the case of a Franklin drive!). Or I can use an off-the-shelf 3 phase pump, and an off the shelf line reactor and VFD combination. Thanks, -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] DIN Rail connector source
Automation Direction. Good prices. Reasonably quality parts. Free 2 day shipping. On 9/26/2016 7:41 PM, William Miller wrote: Colleagues: I have been building a number of custom control and monitoring cabinets lately for some of our more complicated installations. I like using DIN rail components-- relays, connectors, fuse holders, etc. I have been buying these parts from Grainger, Newark, Digi-key, etc. From these suppliers there are a dizzying array of parts available, so much so that it is difficult to discern what will fit my needs. Also not all of them are of good quality. I am wondering if any of you have a found a single-source supplier you prefer for DIN rail components that you might recommend? Hopefully ne from which I can choose the parts I need without wading through 50 catalog pages. Also, is there a brand or style of connector block any of you favor? Most of my applications are low current. Thank you in advance for any input. Sincerely, William Miller Gradient Cap_mini Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600 ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Stolen modules, what to do?
What's the point in any of this? I can break 1/4" hardware with a standard ratchet wrench. Save the time and dollars and use it to buy spares or put the modules up out of reach. -James Jefferson Jarvis APRS World, LLC This message sent from my cell phone. My apologies for brevity and spelling errors. On May 19, 2016 08:08, "Chris Mason" wrote: In Haiti they use steel framing and weld in the modules. On Thu, May 19, 2016 at 6:02 AM, wrote: > Might try Loctite Red - Just remember it takes 400*F to remove. Good Luck. > db > > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564(802)-483-2564 > www.Foxfire-Energy.com > NABCEP #092907-44 > > > Original Message > Subject: [RE-wrenches] Stolen modules, what to do? > From: Jeremy Rodriguez > Date: Wed, May 18, 2016 9:22 pm > To: "re-wrenches@lists.re-wrenches.org" > > > I was at a site today that had four out of the 50 modules removed recently > by thieves. Can anyone recommend a good alternative to the Unirac hardware? > I mean like tamperproof security hardware? > It has T-bolts with top clamps utilized. Of course it is a ground mount > and is easily accessible. > > Jeremy Rodriguez > Solar Installation And Design Expert > All Solar, Inc. > 1463 M St > Penrose Colorado 81240 > > Sent by Jeremy's iPhone. Sorry for typos and shorthand! > ___ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > Call > Send SMS > Call from mobile > Add to Skype > You'll need Skype CreditFree via Skype > > ___ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- Chris Mason NABCEP Certified Solar PV Installer™ Solar Design Engineer Generac Generators Industrial technician www.cometsolar.com <http://www.cometenergysystems.com> 264.235.5670 869.662.5670 Skype: netconcepts ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Rapid Shutdown
On 3/15/2016 3:57 PM, Starlight Solar Power Systems wrote: I thought this idea (attached) was a simple solution for array and battery rapid shutdown using a Classic controller and solenoids. The PV solenoids are 350 amp continuous @ 700 Vdc, and 400A @ 48 volts for the battery. Cost is about $120 each. Larry, Any details on these $120 solenoids? Are they latching coil, or will we be burning another 5 to 20 watts per device to keep them closed? I did a quick search of Midnite's site and got no relevant hits with relay, solenoid, or contactor as search terms. Thanks, -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Flying with Makita batteries in checked or carryon?
Carry your batteries in carry on. Absolutely no issues that way. I do it multiple times per month. -James Jefferson Jarvis APRS World, LLC This message sent from my cell phone. My apologies for brevity and spelling errors. On Sep 28, 2015 5:18 PM, "Dan Fink" wrote: > Esteemed Wrenches > I normally drive to jobs with my tools, or UPS ship the tools ahead of > time. This upcoming MET tower maintenance job in Nevada is too tight a > timeline to drive or ship. I figured some of you have recent experience > with this, and the rules seem to change quickly. I have to fly with my > impact, driver, 3 batteries and charger. > > From the TSA PDF (no date of course): > > https://www.faa.gov/about/office_org/headquarters_offices/ash/ash_programs/hazmat/passenger_info/media/faa_airline_passengers_and_batteries.pdf > > My batteries are 56 watt-hour lithium ion; I'd rather not have this heavy > stuff in my carry-on. What is "protected" for checked bags, the Makita has > a sliding sleeve. Does that count? No "spare" batteries allowed in checked > bags? I am taking this that I can bring one battery in my checked bag, one > in my carryon, and a charger? That would work. > > Any input appreciated, a long security delay or seized tools would be a > big problem. > > Dan Fink > Adjunct Professor, Ecotech Institute > IREC Certified Instructor™ for: > ~ PV Installation Professional > ~ Small Wind Installer > Executive Director, Buckville Energy > NABCEP / IREC / ISPQ Accredited Continuing Education Providers™ > 970.672.4342 > > > > ___ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Gen preheat in cold climates
On 4/3/2015 9:32 AM, drake.chamber...@redwoodalliance.org wrote: We are dealing with a generator that absolutely won't start when cold, so I was considering a block heater. Below 20 deg F it has proven worthless, and we can see -20 F on occasion. I had a generator like that. Below zero it wouldn't start. Replaced it's cranking battery with a bigger battery and it starts great. There are also super-capacitor based solutions to get better cranking. If you have a 24 volt system and your generator is near your battery bank, you may even be able to put a 24 volt starter on the generator and start from your battery bank. My concern is using power from a low battery on a cold cloudy day to heat a generator. How long does it take to make a difference? Has this method proven 100% reliable? What type and how big of engine are you talking about? How big is the block heater? My limited block heater experience with vehicles, tractors, etc is that an hour won't be enough. A couple hours is needed. With coolant heaters and fuel injected engines, an hour can actually cause problems. A pocket of coolant gets warm and tricks the engine management computer into thinking the coolant is warm. Then it tries to do a warm start and fails. Getting a generator that starts reliably is the best solution I see for a moderate sized off grid installation. Otherwise you are putting a lot of energy into warming up an engine that might not start. And leaving you in a worse situation than you started. -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] 48 VDC to 24 VDC Relay
On 3/27/2015 1:20 PM, Chris Worcester wrote: We do have the damper motor running on the Samlex 48V to 24V converter, now we need a relay to switch the motor when the divert load switches on/off. The divert controller is going to be PWM'ing whatever is connected to. A relay won't be happy being driven by that. You need a voltage controlled switch that will come on at the same time as your dump controller should. Outback and Midnite charger controllers will have an AUX contact that can do that. Morningstar has their Relay Driver. And there are a host of other outfits that make voltage controlled switches. Or you could control the actuator based on temperature, like they usually are. Good luck, -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] PV Mod skylight (clear backsheet)
Silicon Energy has panels that let light through. Expensive, but very strong. http://silicon-energy.com/ -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Load testing Lithium battery bank
On 3/17/2015 3:07 PM, Ray Walters wrote: Those look like your solution. Also water can take more heat with less trouble than air heaters. I've had air heaters start melting things, etc. You can just install those in the side of a 55 gal barrel with a bulkhead fitting, or yes, weld the appropriate plumbing fitting to the side of the barrel. Might even be able to install them into a section of pipe with Ts and run water through it to cool the elements. Note that water heater elements are NPSM (National Pipe Straight Mechanical) and not NPT. So you need that type of half coupling or "bung" to weld in. The vegi-oil people seem to have this sort of stuff as they build water heater elements into things. -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Low wattage 120vac to 24vdc transformer for LED's
It's called a switching power supply. There are thousands and thousands of different models. Typically universal input voltage (80 to 300 volts AC, more or less) and DC output. Should be in the upper 70's to mid-90's percent efficiency. Mean Well is a decent quality brand. Prices are good. Buy from Jameco. Just put it at the beginning of the circuit that feeds all your lights. Power supplies are efficient when they are loaded. With no load, efficiency drops to 0%. Like idling your car at the stoplight ... 0 MPG. My house is all low voltage DC lighting. I have a single 200 watt power 120VAC to 24VDC switching power supply that runs everything in the house. -James Jarvis APRS World, LLC On 1/29/2015 12:58 PM, Dave wrote: We are renovating a 25 yr old off grid house and one of things being done is to change some 24vDC circuits to 120vac. The only problem that I'm having is finding a low wattage 120vac to 24vdc transformer for a few strings of 24v LED night lights (a few watts each string) that are built into some nice hardwood trim in the bedrooms. I just tested the following device and found that it uses 29 Watts to power a 3W LED. Not an acceptable load for this house. It is labeled as LED Magnetic Transformer by National Specialty Lighting part # TR24L20DC-M20L24DC-AR Input: 120vac, Output 24vdc, Maximum 20W Is there anything else available that will do this job and use a lot less power than 29 Watts? Thanks, Dave David Palumbo Independent Power LLC 462 Solar Way Drive Hyde Park, VT 05655 802-888-7194 ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Gin Pole
On 7/30/2014 8:37 AM, Mac Lewis wrote: I am considering a service call that requires dropping a 60' guyed wind turbine tower. I am comfortable checking out turbines, but I've never dropped or erected one. The original installer is no longer in business in the area. I am trying to figure out the best way to do this. According to the owner, originally a gin pole was used to erect the tower. How tall should a gin pole be in order to drop a 60' tower? I've been doing internet research and it seems doable (and fun). What info do I need about the site to do this properly and safely? Mac, if you have never done tilt over tower work, you don't want to learn on a customer system. Especially one that doesn't have correct hardware with it. Your likelihood of dropping the tower and turbine will be high. I would recommend subbing it to someone that has done this type of work before. Or rent a manlift and do your work in the air. If you do decide to do it yourself, keep yourself and anything of value out of the danger zone. Tilt over towers can be quite dangerous and anyone that has worked around them will have stories of them falling. You are at a double dis-advantage having no experience and not knowing if this one was laid out correctly. Best of luck. Stay safe. -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] RS485 wiring
RS-485 likes 120 ohm impedance cable. CAT5 is that and is generally a good choice for RS-485. RS-485 is differential signaling, so make sure that you use a single pair for A (D-) and B (D+). Your C (common) can be any other wire. Belden Data-tuff is good stuff. Midnite Solar also apparently sells 600 volt rated CAT5e. Shielding is helpful, but probably isn't necessary. Termination resistors are essential. Follow the manufacturers recommendations on these. Good luck, -James Jarvis APRS World, LLC On 5/14/2014 7:40 PM, will...@millersolar.com wrote: Friends: I am connecting up some RS485 cards in Sunny Boys and Sunny Islands. Can I use Cat5 wire for that? It is supposed to be shielded which standard Cat5 is not. As usual, 600 volt rating would be preferable. Anyone have a source? Maybe this is another use for the Belden Data-tuff wire. It is shielded if memory serves me correctly. Thanks for the input. William Gradient Cap_mini Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600 ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Flexible stranded Connectors
What I have done, and it passed muster of my AHJ, is to use a dual wire aluminum set screw lug (see picture) that is connected to the SI lug with two round copper 1/2" diameter "slugs". The cables from the battery then attach to the bolt hole on the set screw lug using a ring terminal. That allowed me to land MTW wire. There is plenty of room in the wire compartment and it actually looks pretty good. Unfortunately I didn't take a picture, or I would post it here for hall-of-shame purposes. But the AHJ liked it and it has been working for a year now. It certainly cost me a whole bunch of time tempered my interest in Sunny Island inverters. -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Polar Power
I have a customer that runs a bunch of them and seems to like them. I sold one to another customer and Polar Power was pretty rude to both my employee and I. I haven't had the occasion to deal with them since, so I can't comment if that was an isolated incident or not. I will note that their control has a bunch of communications interfaces on it. But they weren't willing to support anything besides the ethernet interface ($$$ extra) and their software. -James Jefferson Jarvis APRS World, LLC http://www.aprsworld.com +1-507-454-2727 (this message was sent from my cell phone ... my apologies for any spelling errors) On Mar 10, 2014 7:57 PM, "Tump" wrote: > Anyone used/have feed back on these DC gensets? The supra controller has > quite a bit to offer. Pricing on these? Thanks in advance Tump > > *t...@swnl.net* *www.SWNL.net* > Solarwinds Northernlights > * Serving Mid Coast Maine & Northern California* > * 207-832-7574 <207-832-7574> Cl. 610-517-8401 > <610-517-8401> * > *Blair "TUMP" May* > > > * MAINE'S CHARTER * * > NABCEP"Certified PV Installer"* > > > * MAINE'S CHARTER ** > Trace Xantrex "Certified" Dealer / Installer"* > > > > > ___ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] morning star ts-mppt-60-600
On 02/12/2014 05:52 PM, Larry Crutcher, Starlight Solar Power Systems wrote: OK, so you need a PC, an internet connection, a router, download and install software, network PC to router, plug in CC, connect PC to the controller, then you can change parameters. Got it…..still say hassle. I can tell you have made up your mind about them. But to work with the facts: a) you don't need an internet connection. b) you don't need a router. c) you don't need a network PC to router. You do need: a) an ethernet cable that you plug into your laptop and into the TS-MPPT-60. b) the MSView software from their website. One software for their whole product line. It is natively windows software, however it runs just fine under Wine on my Linux computers and I suspect the Macintosh has something similar. There is no part of the Morningstar product line that requires, or even uses the Internet. -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] morning star ts-mppt-60-600
The Morningstar TriStar MPPT 60 and the 600 volt 60 amp both have ethernet built in. Yes, you use their MSVIEW software, but no you don't need an RS-232 cable. The MSView software allows you to easily load previously developed settings and to easily save and print those settings. After putting lots of Morningstar products at remote site, I found found them not to crash, glitch, reset, or do anything besides work. I've found the built-in communications (using industry standard Modbus) to be excellent and easy to manage. I've not found any other charge controller manufacturer that has unified software across their whole product line, a unified communications standard, and the level of built-in monitoring the Morningstar products have. I'll take RS-232, RS-485, or Ethernet any day over proprietary stuff that doesn't work. I don't have any vested interest in Morningstar. I've just spent a lot of time developing monitoring and control software to work with all manners of different equipment. And when I get my choice, I go with the Morningstar stuff because I know it works well. -James Jarvis APRS World, LLC www.aprsworld.com On 02/12/2014 03:31 PM, Larry Crutcher, Starlight Solar Power Systems wrote: Hello William, There is a hassle factor with the Morningstar MPPT controllers. If you need a custom charge setting, and I do most of the time, then you must download and install software, use a RS-232 data cable, and reprogram settings from a Windoz PC. That's SO 1980's!. We don't sell many Morningstar controllers because many of our battery systems are Lifeline, Sun Xtender or FullRiver AGM batteries. None of the DIP switch settings are right for those batteries. Also, none are right, but close, for Trojan or Crown batteries which we also sell. Besides that, I left the world of Microsoft many moons ago and I also can't find my DB9 cables anywhere. Larry On Feb 12, 2014, at 12:50 PM, will...@millersolar.com <mailto:will...@millersolar.com> wrote: Hello again: Anyone have any experience with these charge controllers? How about the meter? Thanks so much for all of the help. William Miller ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Oddball wire request
Instead of un-obtanium wire, can you glue a modern j-box onto the module, over the top of the old j-box? For example: http://www.digikey.com/product-detail/en/1986175-3/A99648-ND/1980953 Or even just an outdoor rated plastic box that has the back cut out? Dow Corning 748 Noncorrosive Silicone Sealant would be an appropriate RTV to use. -James Jarvis APRS World, LLC On 10/9/2013 9:48 PM, Allan Sindelar wrote: Wrenches, I do a fair amount of work on ancient systems, just because there's been off grid here for decades. I'm rewiring several old arrays for my next door (meaning < 1/4 mile away) neighbor. The particular array has six 53W Solec modules wired as three two-module 24V pairs, on a Zomeworks tracker so old that it has aluminum rails and attached freon canisters instead of the integral square tubes. Both modules and tracker continue to work well, but the wiring is so degraded from sun exposure that's it's bare in spots, and this is what I want to fix. Each module has a tiny j-box - 3" x 3" x 7/8" deep. Each j-box has a single 3/8" cord grip bushing (CGB). Each bushing has two #10 conductors coming out of the single hole in the CGB. The O.D. of each wire is about the same as that of THWN. The problem is that the single hole in the CGB is only large enough to fit this diameter. USE-2 is too large, and modern PV wire is way too large. I bought a dozen replacement 3/8" CGBs from Del City, but the matching lock rings are too large to fit inside the j-boxes. I'd be cautious about using a narrow Unibit to drill an additional hole in each j-box anyway, given that the holes would be so close to the backsheet. The easiest solution would be to find some sunlight-resistant, wet-rated single-conductor wire in #10 or #12 that has an insulation O.D. about the same as THHN/THWN. Any ideas, please? Code is not an issue in this instance - I just want a solution that works. I thought about using float switch cable, which is UV-resistant, wet-rated, direct-burial-rated type TC. We keep plenty in stock for signal circuits, and it fits and is strong. The problem is that I need single conductors, because each module will have one series conductor and one output conductor, and they run to different locations. Are there any better ideas out there? Thanks, Allan -- *Allan Sindelar* _Allan@positiveenergysolar.com_ <mailto:al...@positiveenergysolar.com> NABCEP Certified PV Installation Professional NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder, *Positive Energy, Inc.* A Certified B Corporation^TM 3209 Richards Lane Santa Fe, New Mexico 87507 *505 424-1112 office 780-2738 cell* _www.positiveenergysolar.com_ <http://www.positiveenergysolar.com/> ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Breaker Space Knockouts
We have bezels laser cut out of 16 gauge steel with the breaker pattern. Then we do a rough cut in the enclosure using a jig saw and rivet the bezel on. Breakers attach directly to the bezel. Alternatively, many enclosure supplies will punch whatever you want into an enclosure. It gets expensive and takes a while, however. -James Jefferson Jarvis APRS World, LLC http://www.aprsworld.com +1-507-454-2727 (this message was sent from my cell phone ... my apologies for any spelling errors) On Sep 25, 2013 1:08 PM, "Drake" wrote: > Hello Wrenches, > > Has anyone come up with a good way to make clean breaker space knockouts > in an enclosure? > > Thanks, > > Drake > > Drake Chamberlin > *Athens Electric LLC > OH License 44810 > CO License 3773 > NABCEP Certified Solar PV Installer > 740-448-7328 > *http://athens-electric.com/ > > > > ___ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] 3-Phase Service, One Phase Fails
Phase loss relay that opens contactor(s) serving the inverters. That will shut everything down if the utility drops a phase. -James Jefferson Jarvis APRS World, LLC http://www.aprsworld.com +1-507-454-2727 (this message was sent from my cell phone ... my apologies for any spelling errors) On Sep 24, 2013 10:12 AM, "Karl Jaeger" wrote: > Greetings Esteemed Wrenches, > > We are building a 35.75kW project with (6) Power One 6000’s. The service > is a 240 delta. The utility is requiring (late in the game) that if one leg > of the service is lost, all inverters must shut down. Of course, we have > two inverters that do not shut down in that circumstance because they are > only tied into the other two phases. SMA has a good (cheap) option to deal > with this, SMA Power Balancers. With other inverters this can be > accomplished by installing an ATS with an integrated controller by > programming in the unacceptable phase imbalance (expensive). Does anyone > have experience with this requirement and/or have a good (cheaper) solution? > > > Thank you in advance! > > ** ** > > Karl Jaeger > > LightWave Solar > > Nashville, TN > > ** ** > > ** ** > > ** ** > > ___ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] programmable relay board
On 9/11/2013 7:44 AM, Mac Lewis wrote: I am looking for a suitable replacement programmable relay board that would offer similar or better functionality as Relays 9 & 10 on the SW. Any suggestions for robust programmable relay boards with good documentation? I am not familiar with relay 9 and 10 operation. But I have found the Morningstar Relay Driver to be a good solid unit. http://www.morningstarcorp.com/en/relay-driver Free software on Morningstar's website. Requires 9 pin RS-232 port on PC. Can program voltage thresholds, generator starts, etc. We used to use them extensively at remote sites. We've gone towards more specialized gear now, but that is not due to any shortcoming on the Relay Drivers part. (incidentally and shameless plug, I have some used units available for $50 + shipping) Good luck, -James Jarvis APRS World, LLC http://www.aprsworld.com/ ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Mouse pee in the SW
On 8/16/2013 2:38 AM, Bill Loesch wrote: Dan, et al, Once the board has been cleaned sufficiently that the inverter is no longer operating intermittently and your "hope" has been realized, when would you apply a field conformal coating? Would you choose/recommend something better than Krylon clear spray? While Dan's cleaning advice is good ... I would not bother with conformal coating. In my experience, it is nearly impossible to get a board actually clean of mouse urine. It soaks into the fiberglass laminate. If you conformal coat it, the traces will be eaten from underneath anyhow. I would bite the bullet and replace the board or the inverter. Otherwise resign yourself for supporting a board that will likely get sicker and sicker at the most inopportune times. I've even run a mouse urine board through a water wash machine, like what is used during the assembly of printed wiring board, and it wasn't able to get the mouse urine washed away. The water wash machine has multiple stages of washing and the appropriate chemicals ... but it couldn't get the soaked material out of the fiberglass. re: conformal I would use a purpose made conformal coating. McMaster-Carr stocks a silicone coating (6801A37) and a acrylic (6801A39) coating. Or Mouser carries Tech-Spray brand coatings. I would further look for a conformal coating that can be removed or reworked through. Most conformal coatings cannot. Given he situation, I suspect that the board will require future attention and that calls for a coating that you can remove or rework through. Especially with the silicone conformal coating, it is almost impossible to remove or rework through. For what it is worth and Good luck, -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] RE-wrenches Digest, Vol 6, Issue 276
On 7/22/2013 8:46 AM, Corey Shalanski wrote: After about six months of testing they seem to be adhering alright to most surfaces, but we can't seem to get anything - including trophy plaques - to stick to SMA inverter cabinets (or any surface with a "grainy" texture) without using some sort of super glue. I'd be interested to hear from anyone who's found a successful method or product for this application. You probably need a "Low Surface Energy" adhesive. Try 3M 300LSE double sided tape. -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] bad battery = system overvoltage = dead inverter
Hi Dan, You can do it! You are looking for a circuit called a crowbar. It is a SCR that turns on when a certain voltage is exceeded. Typically implemented with an SCR and a zener diode. The SCR, when turned on, shorts out the battery. And BAM you blow the big fuse in the battery bank or before the load you are trying to protect. So the SCR needs to be able to handle the fuse blowing current for just long enough to blow the fuse. http://en.wikipedia.org/wiki/Crowbar_%28circuit%29 You could make a variant of this that trips a shunt trip circuit breaker. Midnite sells some shunt trip breakers that could be suitable. More expensive to do it this way, however. -James Jarvis APRS World, LLC On 3/15/2013 10:05 PM, Dan Fink wrote: This has been happening all too frequently here. We live in a big area of off grid homes, dozens of systems. Lost a customers Trace 2624 this morning; One L-16 in older 24v bank opened internally. PV array/MPPT control zorched inverter as soon as the sun came up. First indication of problems last nite when customer hit microwave to warm up dinner and inverter went crazy. This morning the bad battery showed 3.2v (yes, I would expect 2 or 4 also) the rest the usual 6+v. Turned on PV array, bad battery immediately up to 11v (yes, 6v L16). Somebody needs to build a "battery condom" with big stacked diodes on a big heat sink or some such solution. A voltage brick wall for system charging inputs. MPPT PV controllers do NOT protect a inverter from input overvoltage if all or part of the battery bank disappears! And last year we saw a nice battery box fire and zorched inverters due to similar -- dual 48v L16 strings, one cell failed and opened, other string dumped everything into the bad one, smoke and flames. Parallel fusing would have stopped that..but not stopped the loss of dual stacked XW inverters from PV overvoltage. Or am I missing something here? Dan Fink, Executive Director; Otherpower Buckville Energy Consulting Buckville Publications LLC NABCEP / IREC accredited Continuing Education Providers 970.672.4342 ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -- -James Jefferson Jarvis APRS World, LLC +1-507-454-2727 www.aprsworld.com ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Relay for excess PV/ AC coupling
600 VDC rated contacts on a relay is going to be expensive. Extinguishing a DC arc at 600 volts needs a vacuum and/or rather substantial arc breakers. You didn't mention current... but I would ball park a relay like what you describe in the multiple hundreds of dollars. Perhaps changing the system design (two inverters? Micro inverters?) would be more cost effective. Switching AC is relatively cheap and very easy. DC is not. -James Jefferson Jarvis APRS World, LLC http://www.aprsworld.com +1-507-454-2727 (this message was sent from my cell phone ... my apologies for any spelling errors) "All Solar, Inc." wrote: >Wrenches, >I have been searching here with little luck. >I am in need of a relay. Ideally, 120vac coil with 600vdc rated contacts. I >am trying to limit the input to a GT inverter an AC coupled sysetm. We need to >drop off two strings to the inverter when the grid is down, thus limiting the >output of the inverter. > >P.S. Dave, I know you are looking into this when you are done traveling! > >Thanks in advance > >Jeremy > >All Solar, Inc. >CO, USA >___ >List sponsored by Home Power magazine > >List Address: RE-wrenches@lists.re-wrenches.org > >Change email address & settings: >http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > >List-Archive: >http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > >List rules & etiquette: >www.re-wrenches.org/etiquette.htm > >Check out participant bios: >www.members.re-wrenches.org > ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Temp sensor cross platform
Morningstar is a 10k NTC thermistor. Most manufacturers are this. You can buy $1 to $5 thermistors from Digi-Key. -James Jarvis APRS World, LLC On 01/09/2013 11:09 AM, Jay Peltz wrote: Hi all I'm wondering if anyone knows if temp sensors are common within the following items Tristars Xantex/ Schneider Outback ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] 24 volt Battery Bank comparison
On 2011-05-31 20:14, Tom Elliot wrote: Good on the buss bars Wayne. Using them removes the concerns about multiple strings and increases redundancy and system stability. You won’t need 4/0 between single strings and the buss bar, you can probably easily use smaller cable, just size it for the individual string. 4/0 to Part of the argument for having multiple strings is for redundancy. If smaller interconnect cables are used, they will likely not have the required ampacity and OCPD to support the full load. In the event of part of the bank needing to be pulled offline there will be downtime and expense associated with upgrading the smaller interconnect cables to support the full load or the proportionally increased load. Food for thought, -James Jarvis ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
