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What wire gauge for a bank of four 12V 200Ah batteries in 4P1S config?

Grimmster

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Joined
Apr 9, 2023
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USA
This guy is connecting four 12V 200Ah batteries in parallel using 2/0 wire, but 4/0 wire from the bank to the master switch.

 
Without knowing his inverter size, we can't tell if there is an issue, but probably not.

His wiring looks like this:

1689555490095.png

Spreading it out, this is essentially the same.

1689555606936.png

Notice that each segment between batteries carries a different fraction of the total. Since the segments are 2/0, the total current it can carry is 285 Amps (I am using the ABYC standard since it is mobile) . 3/4 of 380A is 285A so as long as the total load is less than 380A it should be OK.

The interesting thing is that the ABYC rating for 4/0 is 385A, so as long as he sized the 4/0 correctly he is probably OK.
 
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