Re: [RE-wrenches] Wireless AC relay
Jay, I have an excellent option for this, I'll send you a connection to the manufacturer. On Wed, Feb 20, 2013 at 11:31 PM, jay peltz j...@asis.com wrote: Hi all I seem to remember some folks using a wireless remote to control a AC relay Any info on this would be appreciated Thanks in advance Jay Peltz power ___ 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 -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts ___ 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] Wireless AC relay
Please post it for the rest of us too! -- Nicholas Ponzio Building Energy 1570 South Brownell Road Williston, VT 05495 802-859-3384 ext.15 (office) 802-658-3982 (fax) 802-318-4783 (cell) http://www.BuildingEnergyVT.com On Thu, Feb 21, 2013 at 6:37 AM, Chris Mason cometenergysyst...@gmail.comwrote: Jay, I have an excellent option for this, I'll send you a connection to the manufacturer. On Wed, Feb 20, 2013 at 11:31 PM, jay peltz j...@asis.com wrote: Hi all I seem to remember some folks using a wireless remote to control a AC relay Any info on this would be appreciated Thanks in advance Jay ___ 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-wrenches] Housekeeping - File sizes and dialup
Hi gang. Please send any response or comments to me OFF LIST. Since we have a fair number of folks on this list who live off-grid, we also had several still stuck with dialup internet access. For them, getting large messages was a hassle. Last year I raised the message size limit to 100K, which is large enough to include viewable jpg graphics of about 75K, along with a reasonable amount of text. About once a week, I end up working with folks who attempt to send messages that are larger than that. But now I would like to get a handle on how many of us still have significant restrictions on data, so please let me know. 1. For folks on dialup, file attachments can be a drag, time-wise. 2. For folks like me, whose home internet access is through cell technology, getting large files can end up being expensive, if their usage exceeds the limits of their phone plans. Of course, there are work-arounds for these things, but for now I would like to hear from Wrench list members who are affected by large messages, to see if I can up the limits. ___ 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] Wireless AC relay
I'd like to see it too, please. Allan Allan Sindelar al...@positiveenergysolar.com NABCEP Certified Photovoltaic Installer NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder and Chief Technology Officer Positive Energy, Inc. 3209 Richards Lane (note new address) Santa Fe, New Mexico 87507 505 424-1112 www.positiveenergysolar.com On 2/21/2013 4:37 AM, Chris Mason wrote: Jay, I have an excellent option for this, I'll send you a connection to the manufacturer. On Wed, Feb 20, 2013 at 11:31 PM, jay peltz j...@asis.com wrote: Hi all I seem to remember some folks using a wireless remote to control a AC relay Any info on this would be appreciated Thanks in advance Jay Peltz power ___ 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 -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts ___ 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 ___ 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] Snow loads
Gary, The snow loads that structural engineers design to are a worst-case scenario. It is true that snow tends to slough off of PV arrays quicker than your normal roof. However, if there is a major snow event, especially if it starts at night (this recent blizzard on the East Coast would be a good example), snow will build up on the array the same as it does everywhere else. In many cases, a PV array actually makes the engineering assumptions worst. Any snow that lands on the modules transfers down to the attachments, and point-load the structural members. The weight of the snow is less distributed when it sits on a PV array, placing additional stress on individual members. I work in Massachusetts currently, and we often have to perform rafter upgrades to roofs that are fine otherwise for exactly this reason. If you have any snow load requirements in your area, I would highly recommend you have a structural engineer review the structure, even if a structural stamp is not required. Jeffrey Quackenbush From: Bob-O Schultze bo...@electronconnection.com To: RE-wrenches re-wrenches@lists.re-wrenches.org Sent: Tuesday, February 19, 2013 3:00 PM Subject: Re: [RE-wrenches] Snow loads I would certainly agree with Will here. You can't make that argument as stated, it's wrong. Please don't try to make it to your AHJ, you take the chance of f-ing it up for everyone around there. I think the best argument you can try is: aside from the usual 3-4lbs/sq/ft that the array itself ads to the roof load, snow will be very unlikely to build up on the modules to the degree that it builds up anywhere else on the roof. The freezing-rain-before-a-snow phenomena is very real and it WILL happen sooner or later. Not often perhaps and under most conditions the snow will leave the modules before the roof. But...Gotta be real about that. Bob-O Schultze On Feb 19, 2013, at 11:06 AM, Will White wrote: Most structural engineers I’ve seen take a reduction for slippery surface but I think you’d be stretching things to say adding PV panels reduces the load to zero. I have a 45 degree pitch roof and I get snow build up some times especially if we get freezing rain before the snow. Also if you have an asphalt shingle roof you can create an unbalanced load with snow sliding off the south side and sticking on the north side. Most engineers take this into consideration too. Thanks, Will __ Will White Regional Field Operations Manager – New England Real Goods Solar 64 Main St. Montpelier, VT 05602 Tel: (802) 223-7804 Cell: (802) 234-3167 www.realgoodssolar.com From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Gary Bassett Sent: Tuesday, February 19, 2013 1:48 PM To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Snow loads Has anyone in the snow belt areas have any luck with convincing their local building inspectors that the snow melts or slides from panels, much like a metal roof only better. Thus your snow load would be reduced to zero where the panels have been installed. Gary ___ 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 ___ 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___ 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-wrenches] Cracking Backing on Sharp NT-175U1 Modules
I inherited the service work on a couple of small commercial PV systems that were installed by another company about 7 years ago. The systems are Sharp NT-175U1 modules and Sharp JH3500U inverters. This client has been losing inverters at a rate of one or two per year for the last couple of years. When I was on-site yesterday, I noticed that the backing on all of the modules (there are 120 modules at this site) looks like it's starting to shrink and crack all over. I've started an inquiry with Sharp but considering their level of response to the high number of inverter failures, I figured I'd come here before they get me doing diagnostic backflips. To be clear, this is the clear part of the backing I think Sharp is calling the weatherproof coating. It does not seem to have affected the white EVA part of the backing. However, the points in the EVA where these cracks run over the solder points between the cells seems to be very thin and I can see the dark color of the solder showing through more than elsewhere. By the time I got done with my testing on specific inverter problems and noticed the panels, I didn't have any more time to do further testing for power output of the modules/strings so I don't have any specific test results to share. My concern here is that this is the beginning of a bigger problem. Has anyone else had this experience? Brian Sipp First Source Solar www.FirstSourceSolar.com 530-554-1925 ___ 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
