Just want to do this one time. Do the Neg. and Pos. battery cables running to the inverter have to the same length? in my case it would be 7' on the Neg. and 3' on the Pos, I have read but only once that they should be the same lenght. Batteries and hooked up to 24volts and will have 4/0 cable
Thanks

They don't have to be same length but it is good practice to run the +/- lines in close parallel dressing. This reduces the effective inductance of the lines which is important as the more inductance, the more surge voltage can develop at the inverter DC input as its current surges up and down with loads. Remember that you are creating AC output which means the time plot of the instanteous DC input current looks like a full wave rectified sinewave. (half sinewave pulses at 120 Hz rate for a 60Hz output inverter)

If you are running parallel battery sets then it is important to ensure the same resistance to each of the parallel connected battery sets. (same wire lengths and connector terminal type) If there is more resistance in one of the sets then the other battery sets will take more of the load and recharge current.