[RMcNeal]

Actually, I think what AZ Traveller was saying is that two 224 AH 6 volt batteries paired together to make 12 volts would only supply 224 AH @ 12 volts, not the 448 AH @ 6 volts. Amp Hours are cut in half when voltage is doubled. With that, your battery bank, wired for 12 volts, will supply 448 AH @ 12 volts, not 896 AH. With 448 AH bank and only 50% draw down, that leaves you 224 AH total usable battery. That's a lot of battery power and also a lot of weight.