While you are considering wire size and insulation, don't ignore the type of wire itself.
One person posted having used welding cable for battery connections, etc. I have removed and replaced several boat's primary battery wiring that were welding cable. These systems were failing because welding cable is made with non tinned wire and the insulation (jacket) is usually of a type that doesn't necessarily prevent water intrusion if submersed. Typically, I found green slime corrosion, wicking away from the terminals as much as a foot!
If you operate in salt water, look for fully tinned marine grade wire and cable. If I remember correctly, that spec. is also included in the ABYC recommendations.
Sailonner
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