Tom; That's exactly what Daryl and I were suggesting: all strings paralleled to a central combiner box with breakers on each series string. The only thing I left out was that each cable set should be the same length ( which Daryl was already suggesting). You need to reread what we were talking about. We got this idea from you many years ago, so the record is not broken; its been pirated, reposted for Free download on all sorts of unsavory sites, and you aren't getting a royalty check.... Imitation is the sincerest form of flattery, and this list listens to and appreciates you.
Thanks, R. Walters r...@solarray.com Solar Engineer On Apr 19, 2011, at 10:16 PM, Tom Elliot wrote: > The broken record will now repeat himself yet again. Bussbars are the way to > go, not across battery terminals but individual strings connected to a > central positive and negative buss from which the inverter connection then > runs. This allows fusing of each individual connection and also allows for > smaller positive cables and no need to have identical length parallel cables > since each string is independently connected. It’s what telecom > installations use. The Telecom guys who showed me how to do it literally > laughed when told about paralleling across battery terminals. They then told > me they considered it profoundly stupid and dangerous and since I had just > avoided a meltdown myself by catching a bad cell before complete failure I > got the message pretty quick. > > Really guys, this is amazingly simple and yes, it may mean a bit more cabling > and another component but from a safety standpoint those considerations are > pretty minor and cheap insurance against disaster. > > Tom > > > > From: R Ray Walters > Sent: Tuesday, April 19, 2011 6:01 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Batteries in parrallel Failure > > I like the fused parallel idea; could save the system, and would make battery > troubleshooting nice. > I would suggest #6 jumpers with 50 to 60 amp breakers, so the system could > be operated on just a few strings if needed. > > R. Walters > r...@solarray.com > Solar Engineer > > > > > On Apr 19, 2011, at 8:29 PM, Darryl Thayer wrote: > >> Batteries in parallel, How to protect from catastrophic failure. >> I just got contacted to commission a solar system off grid not of my design. >> Eight battery strings in parallel, AGM batteries, 24 volts @ 120 AH each >> string (two 12 volt in series) New system, new batteries, Silent POwer >> Inverter. Two kW DC array. generator to charge through Silent power. >> (present installer is not sure how to do final set up and testing) >> >> I am most concerned about 8 batteries in parallel, (especially since last >> week a set of AGM burned up having 5 in parallel Owner had no way to break >> the paralleling of the batteries, she could only stop the chargeing) What >> I am proposing for your review is requireing the installtion of two >> combiner boxes Midnight solar with a breaker in each battery string, using >> about 3' of #10 to connect each battery string to the combiner box. This >> way if a battery failed and the paralled strings were to "dump" into the >> failed battery it would trip the breaker. I was thinking of using a 30 amp >> breaker in each string. The main breaker is set at 240 amps. >> >> Ideas Please? >> >> _______________________________________________ >> 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 > > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1321 / Virus Database: 1500/3584 - Release Date: 04/19/11 > > _______________________________________________ > 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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