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 [email protected] 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: [email protected] > > 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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