I have 8x220ah deep cycle car battery's at 12v and i wanted to run an 5kw 12v power inverter but i would need cable which is 400amp 12x4004800 so could i use two cable connected to the battery's and split the power into 2 cable or would this not work if so whythe inverter would be using 400amps from the battery and it would be supplying 20amps at 240voltsis my working out correct
In this case, you should have put the batteries in series to get 48 or 96 volts, that makes the cabling easier. Too late now. Yes, at 5kW, that is 5000/12 420 amps I don't know what size wire you are using, and what the distance is, so I can't help further without that information. For example, if you are running 10 feet of cable (20 total) and you want to lose only 5% of the voltage, which is 0.6 volts, then the resistance of the wire needs to be less than 0.6/420 1.4 mΩ. That is, over 20 feet, 71 mΩ per 1000 feet, which is 000 AWG wire. Mush more than 10 feet, and you need to use MCM wire. .
