https://www.wirebarn.com/Wire-Calculator_ep_41.html
It all depends. This calculator will tell you exactly what is recommended for wire size based on voltage and amps passing through the wire. You need to figure out the total wire length which includes both the positive and negative wires combined to get your actual length.
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John and Nancy
2018 f350 SRW 6.7,Airlift 5000 w/compressor, Andersen Ultimate hitch,2019 Montana 3120RL, 4-100Ah LiFePo4, 1200W Solar with 2-Victron MPPT’s, Victron Multi-plus 3000/12/120, Victron BMV-712, Renogy DC/DC 40Amp charger, WeBoost RV 65.
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