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Maximum recommended distances for different wire sizes at 12V:
The chart below shows the maximum recommended distances for wire sizes at 12V (multipy x2 for 24V). First, decide how much power you will need from that wire (amps) and then read across from the right. 2% loss.

Wire Size
Amps@12V 12 10 8 6 4 2 1/0
2 amps 36' 60' 96' 144' 240' 372' 588'
4 amps 18' 30' 48' 72' 120' 186' 294'
6 amps 12' 20' 32' 48' 80' 124' 196'
10 amps 7' 12' 19' 29' 48' 74' 118'
15 amps 5' 8' 13' 19' 32' 50' 78'
20 amps 4' 6' 10' 14' 24' 37' 59'
30 amps 2' 4' 6' 10' 16' 25' 39'
50 amps 1' 2' 4' 6' 10' 15' 24'
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