What size power and ground wire do I need

[Tim456]

I am thinking of using 2/0 sky high but i am not sure i have a 2500 watt rms subwoofer amp at 1 ohm going to be running a 500 watts rms 4ohm each channel  4 channel class ab amp each amp takes 200 amp fuses i have a 4 ohm 75 watt per channel  2 channel class d amp that take 20 amp fuse I am running dual lithium batterys because I like to listen to music sometimes with car off going to be at least 20ft run between batterys would 2/0 sky high be enough for power and ground then do a frame ground between front battery and back batterys then ground wire between would that be overkill or does that sound good i also have a 370 amp mechman alternator with upgraded power and ground wire to battery and engine but it recommends a frame ground so that's why I was thinking of doing to frame grounds