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my 50 amp service cable uses 8 gauge wire and is 30 feet long. The 6 gauge wire should handle whatever the converter will put into the batteries, which should only be a high current for a short period of time during the bulk charge part of the charge cycle.
If you were running a high output inverter, then I'd recommend maybe a 2-0 welding cable, but that's a completely different application.
Bob
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