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7/8/08 5:14 PM EST

Voltage Drop & Max Ampacity Charts

Maximum distance in feet of various guage two conductor copper wire from power source to load for 2% voltage drop in a 12 volt system.  Do not exceed the 2% drop for wire between PV modules and batteries.  A 4 to 5% loss is acceptable between batteries and lighting circuits in most cases. 

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2% Voltage Drop Chart
Amps #14 #12 #10 #8 #6 #4 #2 #1/0 #2/0 #4/0
1 45 70 115 180 290 456 720 . . .
2 22.5 35 57.5 90 145 228 360 580 720 1060
4 10 17.5 27.5 45 72.5 114 180 290 360 580
6 7.5 12 17.5 30 47.5 75 120 193 243 380
8 5.5 8.5 11.5 22.5 35.5 57 90 145 180 290
10 4.5 7 11.5 18 28.5 45.5 72.5 115 145 230
15 3 4.5 7 12 19 30 48 76.5 96 150
20 2 3.5 5.5 9 14.5 22.5 36 57.5 72.5 116
25 1.8 2.8 4.5 7 11.5 18 29 46 58 92
30 1.5 2.4 3.5 6 9.5 15 24 38.5 48.5 77
40 . . 2.8 4.5 7 11.5 18 29 36 56
50 . . 2.3 3.6 5.5 9 14.5 23 29 46
100 . . . . 2.9 4.6 7.2 11.5 14.5 23
150 . . . . . . 4.8 7.7 9.7 15
200 . . . . . . 3.6 5.8 7.3 11
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Maximum Ampacity for Copper
and Aluminum Wire
Wire Size Copper Aluminum
14 25 .
12 30 25
10 40 35
8 55 45
6 75 60
4 95 75
2 130 100
1 150 115
1/0 170 135
2/0 265 150
4/0 360 205

NEC allows rounding up cable ampacity to next standard fuse or breaker.

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