2 12 volt batterys or 2 6 volt
what gives me the most bang for my money. every other rig that I have bought always had 6 volt battery's but the new one has 2 12 volt. not sure what works better.
Forum Discussion
rjxj wrote:
Very close in price. My problem with 12's is that my tray is too narrow. Four 6's (430ah)sit side by side but only two 12's (310ah) end to end. Mine had group 24's in it from the original owner and one of them was still working after 14 years!!! That's HALF a CAREER!!! I think it was an interstate.
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If you compare, or example, Trojan's # cycles vs depth of discharge charts, their T105s (6V GC2 FLA) should last ~1700 cycles when discharged down to 50%, while their T1275s (12V GC12 FLA) only last ~1200 cycles. Of course both will last a lot longer when discharged to less than 50%.
So if full-time boondocking, T105 GC2s might make more sense economically in the long run. But we don't boondock anywhere near 365 days per year, and even then only occasionally hit 50% discharge (especially if I double the battery bank size). So this isn't a concern to us.
Of more interest is V sag under heavy inverter load (especially if we move up to a 2000W inverter). If the 12V GC12 FLAs really do have less voltage sag under load for the same battery bank Ah, and there is no cost or weight penalty, then they are very attractive.
Apparently the the FLA GC12s will have less V sag under load, but I'm not sure how much relative to the same Ah of FLA GC2s, or why there is any difference? Hmmmmmmm?
