Re: [RE-wrenches] Generators and Grid-tie Systems
The issue of what will or will not hurt an inverter, when connected to a generator, does not seem to be resolved. The fail safe method, of course, is to connect to the line side of the transfer switch. Other than that, there are varied views. There are systems in operation that intentionally AC couple generators to on grid inverters. A post on the List had linked to an article about such a system, but so far I can't find the information. Has anyone else had problems with isolation relays? This was a recommended method that didn't work for me. Drake Chamberlin Athens Electric OH License 44810 CO License 3773 NABCEP TM Certified PV Installer Office - 740-448-7328 Mobile - 740-856-9648 ___ 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] Irradiance data
David - Thanks! This is great as an average for comparison. Any thoughts on where I could get data specifically from 2009 or the last couple of months? On Wed, Mar 3, 2010 at 10:52 AM, David Brearley david.brear...@solarprofessional.com wrote: Look for a super comprehensive article on the topic of production modeling in the Apr/May issue of SolarPro (SP3.3) by Tarn Yates and Bradley Hibberd of Borrego Solar. It includes information on TMY (typical meteorological year) data, like that published by NREL here: http://rredc.nrel.gov/solar/pubs/redbook/ David Brearley, Senior Technical Editor *SolarPro* magazine NABCEP Certified PV Installer ™ david.brear...@solarprofessional.com On 3/3/10 9:35 AM, Andrew Truitt atru...@gmail.com wrote: Is anyone aware of a resource for finding local historical irradiance data? We've had a cloudy winter around the DC Metro area and I would like to quantify how far down we are from the average for new customers concerned with production. Thanks in advance, Drew ___ 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 -- Don't get me wrong: I love nuclear energy! It's just that I prefer fusion to fission. And it just so happens that there's an enormous fusion reactor safely banked a few million miles from us. It delivers more than we could ever use in just about 8 minutes. And it's wireless! ~William McDonough ___ 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] Irradiance data
You might check in with the monitoring companies you work with to see if they can pull up the data from one of your sites with an irradiance meter. You might already have this in an admin view. If not, maybe someone on this list does. NREL or Sandia may also collect this data on an ongoing basis. While I¹m not sure who you¹d contact, there are extensive resources listed at the end of the Production Modeling article in SolarPro. That issue will post online this week start mailing very soon. I also suspect 3TIER has the data you want (http://www.3tier.com/en/), but I¹m not sure they¹d give it away. Since you¹re not planning on making money with the data, maybe they¹ll share. Doesn¹t hurt to ask... On 3/3/10 12:57 PM, Andrew Truitt atru...@gmail.com wrote: David - Thanks! This is great as an average for comparison. Any thoughts on where I could get data specifically from 2009 or the last couple of months? On Wed, Mar 3, 2010 at 10:52 AM, David Brearley david.brear...@solarprofessional.com wrote: Look for a super comprehensive article on the topic of production modeling in the Apr/May issue of SolarPro (SP3.3) by Tarn Yates and Bradley Hibberd of Borrego Solar. It includes information on TMY (typical meteorological year) data, like that published by NREL here: http://rredc.nrel.gov/solar/pubs/redbook/ David Brearley, Senior Technical Editor SolarPro magazine NABCEP Certified PV Installer david.brear...@solarprofessional.com http://david.brear...@solarprofessional.com On 3/3/10 9:35 AM, Andrew Truitt atru...@gmail.com http://atru...@gmail.com wrote: Is anyone aware of a resource for finding local historical irradiance data? We've had a cloudy winter around the DC Metro area and I would like to quantify how far down we are from the average for new customers concerned with production. Thanks in advance, Drew ___ 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] Generators and Grid-tie Systems
On Mar 2, 2010, at 11:57:26 AM, Darryl Thayer daryl_so...@yahoo.com wrote: But I have tried a few times and I can not ever get a grid tied inverter to sync with a generator. It depends on the generator. Yesterday I ran a kohler 12 res with a parallel connected sb7000. I monitored the freq during the connect time and it stayed on the money. The blinking green lite on the sb told me it was going to connect. At this time I stopped since I was not ready to experiment on my customers system. I do believe , in principal, it should work as just outlined in the previous post. Don Offline Solar ___ 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] Generators and Grid-tie Systems
What brands of generators have you had good experience synching with off-grid inverters (Outback, Magnum, Xantrex)? We sell Kohler, but we'd like to offer an alternative (that we could sell). I've heard good things about Honda, but I've heard that you need to be a Honda dealer to sell them. Any suggestions? Jonathan Hill, solar applications engineer Sierra Solar Systems tech info and foreign orders: (530) 273-6754 order line: (888) ON-SOLAR (US only) FAX: (530) 273-1760 e-mail: mailto:solar...@sierrasolar.com world wide web: http://www.sierrasolar.com On Mar 3, 2010, at 6:40 AM, Drake Chamberlin wrote: The issue of what will or will not hurt an inverter, when connected to a generator, does not seem to be resolved. The fail safe method, of course, is to connect to the line side of the transfer switch. Other than that, there are varied views. There are systems in operation that intentionally AC couple generators to on grid inverters. A post on the List had linked to an article about such a system, but so far I can't find the information. Has anyone else had problems with isolation relays? This was a recommended method that didn't work for me. Drake Chamberlin Athens Electric OH License 44810 CO License 3773 NABCEP TM Certified PV Installer Office - 740-448-7328 Mobile - 740-856-9648 ___ 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] acre/MW
Thanks Scott and Kirpal for your responses as they were very helpful. Mike - Original Message - From: Scott McCalmont To: RE-wrenches Sent: Tuesday, March 02, 2010 11:36 AM Subject: Re: [RE-wrenches] acre/MW It will depend on the technology of the modules, too--whether you're using monocrystalline, poly, or thin-film. I recently spec'ed a thin-film design which worked out to 150 kW per acre. With more efficient modules you could be 50% better, so your 5 acre/MW number is reasonable. It also will depend on where you are building the plant. At higher latitudes, you might want the array to have a greater tilt, which probably means you will space the rows out more to minimize inter-row shading. Scott Scott McCalmont, P.E. McCalmont Engineering San Jose, CA On Tue, Mar 2, 2010 at 7:23 AM, Michael Gullo mgul...@comcast.net wrote: Esteemed wrenches: We are bidding on an industrial sized project. What is the approximate land usage of a ground array in acre/MW. I have estimated around 5 acre/MW but I'm really not sure if I am way high or low. Thanks. Mike Michael Gullo Solar Solutions LLC Marlton, NJ NABCEP Certified PV Installer ™ ___ 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 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
