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You have never tried to start a diesel in sub zero weather, let alone a 24 volt Cat or any multiple battery truck. I've melted 1's, and bigger. Good clamps and a 0 minimum. May be heavy but will always work for anything, welding wire is better for the reasons stated. Build them once build them for anything.
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Lol, you don't want anything with a /0 in the size, especially at 15-20 feet in length. #2 AWG will handle anything that needs to be done on 12 or 24v systems down to sub-zero temps.
You have never tried to start a diesel in sub zero weather, let alone a 24 volt Cat or any multiple battery truck. I've melted 1's, and bigger. Good clamps and a 0 minimum. May be heavy but will always work for anything, welding wire is better for the reasons stated. Build them once build them for anything.
24Vs actually halves the current... And thus the voltage drop as well...
For normal people vehicles <15ft I probably wouldn't go bigger than 2awg or so, make sure it had good clamps.
Length has a huge contribution on how thick it needs to be, twice the length of the cable doubles your voltage drop. There are tables for resistance of the wire...