Check this out. https://www.wirebarn.com/Wire-Calculator-_ep_41.html
This calculator is for 12 volt system and gives you minimum acceptable
wire size and voltage drop over a given distance.
Larry Flesner
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Example: 12 volt / 20 amp circuit , 14 gauge minimum, 1% voltage drop,
max length 2.4 feet, 11.9 end volts.
Larry Flesner
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