Battery Bank Wire Size
I built my battery bank four 12 volt deep cycle batteries with 340 amp hours. At the time I had not added the 500 watts of solar and a 2000 watt inverter that I now have. At the time I used 2 ...
Forum Discussion
At 150 amps (approx. 1800 watts), a 5 foot run of 2 gauge (10 feet total wire length) will introduce around 0.3 volts of drop.
So, if your fully-charged batteries have a "resting" voltage of 12.5 volts, you would expect 12.2 volts at the end of your 5 foot wire run when drawing 150 amps - and any additional drop would be due to the internal resistance of the batteries themselves.
Going to 2/0 wire gauge under those same conditions would produce a voltage drop of 0.15 volts in the wire.
A 0.15 volt improvement isn't much.
So, if your fully-charged batteries have a "resting" voltage of 12.5 volts, you would expect 12.2 volts at the end of your 5 foot wire run when drawing 150 amps - and any additional drop would be due to the internal resistance of the batteries themselves.
Going to 2/0 wire gauge under those same conditions would produce a voltage drop of 0.15 volts in the wire.
A 0.15 volt improvement isn't much.
