HI Tom; We just almost set up a large system as you have recommended. I even had made up some huge isolated buss bars to run each string separately as you described. In the end, I chickened out, as it was going to be a lot more 4/0 cable, and I wasn't sure if the inspector would go for it. So we just did it with parallel cables, and single mains off the opposite ends. I think you're right though, but I just wasn't sure if the inspector would agree with us, too. What do you use for buss bars? How do you mount the busses in the battery room? I know batteries aren't UL listed, but are the buss bars? Do you have some Pics, and then I could show the inspector, and see what he thought. It would be the best way.
R. Walters r...@solarray.com Solar Engineer On Dec 1, 2009, at 11:37 AM, Tom Elliot wrote: > Had that arrangement used a buss bar instead of paralleling the bank together > through the batteries that part of it wouldn't have been a problem. I'm > still puzzled by the off-grid community's resistance to designing battery > banks the way large telco banks are designed, using buss bars as parallel > connections and the inverter connection point and leaving the series strings > physically isolated from one another. > > > From: wind...@wind-sun.com > Sent: Tuesday, December 01, 2009 8:28 AM > To: RE-wrenches > Subject: Re: [RE-wrenches] concord batteries, EQUALIZE Them! > > You gotta wonder about why the customer bought such a battery layout, or why > the installer sold that kind of configuration (which ever it was) with so > many small batteries. We would never recommend going over 2 parallel banks, > but sometimes the "customer knows best...". > > .................................................................................................. > Northern Arizona Wind & Sun - Electricity From The Sun Since 1979 > Solar Discussion Forum: http://www.wind-sun.com/ForumVB/ > .................................................................................................. > ----- Original Message ----- > From: Travis Creswell > To: 'RE-wrenches' > Sent: Tuesday, December 01, 2009 11:18 AM > Subject: Re: [RE-wrenches] concord batteries, EQUALIZE Them! > > Then you can patch together one or two strings in effort to get the system in > some sort of operational state while the owner digests that his $12,000 ($300 > each x 40) battery is toast but even if you could fix it, it’s just a bad > band-aid and he needs to pony up another $8k-$12k for a real battery bank. > > Gotta go, good luck! > > Travis Creswell > Ozark Energy Services > > > > > > _______________________________________________ > 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 > > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.709 / Virus Database: 270.14.88/2537 - Release Date: 11/30/09 > 11:05:00 > _______________________________________________ > 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 >
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