I think it's only about available aH.
6 volt golf cart batteries are readily available
and hold a lot of aH....more than the average hybrid type marine/rv battery
Trojan 6V cart battery T-105 holds 225aH at teh 20 hour rate, so a bank of two would be 450aH, right?
Trojan 12 V T-1275 is 150aH in a slightly larger and heaver box, so a bank of two would be only 300aH.... and perhaps a bit less available
the hybrid marine type boat/rv batteries hold much less still
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