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Sailpilot,
When you wrote, "My friend, told me these things wired in 12volt (2+2) would give me 400+amps?", I dected a possible point of confusion --
If the manufacturer rates a single battery at X amp hours that's X amp hours at the voltage of that battery. E.g. individual Trojan 105's Cam mentions are 225 amp hours at 6V. You wire two of them in series to increase the voltage to 12V but you don't double the amp hours -- the two T 105 batteries series are still 225 amp hours, but now the output is at 12V. You've doubled the potential output in watts (Watts = volts x amps), but not the amp hours.
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