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<strong>Wire</strong> <strong>Sizing</strong> <strong>Chart</strong><br />
Check the chart below to determine the wire size that you need to run from your array to your<br />
charge controller. Use the sum of the amperages of your solar panels (or pairs of solar panels<br />
if you have a 24 Volt system) times 1.56 (for NEC Code) and find that number, or the next<br />
highest number, in the "amps" column. Move to the right until you find the distance you have<br />
to travel to your controller. Move up that column to find the size wire you need. In most cases<br />
that wire will be copper.<br />
12 Volts 2% <strong>Wire</strong> Loss Table Distances are in feet<br />
amps watts 14g 12g 10g 8g 6g 4g 2g 1/0g 2/0g 3/0g<br />
4 48 10 17 27 45 72 114 180 290 360 456<br />
6 72 7 12 17 30 47 75 120 195 243 305<br />
8 96 5 8 14 22 35 57 90 145 180 228<br />
10 120 4 7 11 18 28 45 72 115 145 183<br />
15 180 3 4 7 12 19 30 48 76 96 122<br />
20 240 3 5 9 14 22 36 57 72 91<br />
25 300 4 7 11 18 29 46 58 73<br />
30 360 3 6 9 15 24 38 48 61<br />
40 480 4 7 11 18 29 36 45<br />
50 600 5 9 14 23 29 36<br />
12 Volts 5% <strong>Wire</strong> Loss Table Distances in feet<br />
amps watts 14g 12g 10g 8g 6g 4g 2g 1/0g 2/0g 3/0g<br />
4 48 25 43 68 113 178 288 450 725 900<br />
6 72 18 30 43 75 119 188 300 481 600 760<br />
8 96 13 21 36 56 88 144 225 363 450 570<br />
10 120 11 17 28 45 71 113 180 290 360 457<br />
15 180 7 11 17 30 47 75 120 193 240 304<br />
20 240 8 13 22 36 56 90 145 180 229<br />
25 300 11 17 28 45 72 115 145 183<br />
30 360 8 15 23 37 60 96 120 152<br />
40 480 11 17 28 45 72 90 114<br />
50 600 13 22 36 57 72 91
24 Volt 2% <strong>Wire</strong> Loss Table Distances in feet<br />
amps watts 14g 12g 10g 8g 6g 4g 2g 1/0g 2/0g 3/0g<br />
6 144 15 24 35 60 95 150 240 386 486 610<br />
8 192 11 17 29 45 71 114 180 290 360 456<br />
10 240 9 14 23 36 57 91 145 230 290 366<br />
15 360 6 9 14 24 38 60 96 153 192 244<br />
20 480 7 11 18 29 45 72 115 145 183<br />
25 600 9 14 23 36 58 92 116 146<br />
30 720 7 12 19 30 48 77 97 122<br />
40 960 9 14 23 36 58 72 91<br />
50 1200 11 18 29 46 58 73<br />
24 Volt 5% <strong>Wire</strong> Loss Table Distances in feet<br />
4 96 50 87 137 226 356 576 900<br />
6 144 37 60 87 150 238 376 600 962<br />
8 192 27 42 72 112 177 288 450 726 900<br />
10 240 22 35 57 90 142 226 360 580 720 914<br />
15 360 15 22 35 60 95 150 240 386 480 608<br />
20 480 17 27 45 72 112 180 290 360 458<br />
25 600 22 35 57 90 145 230 290 366<br />
30 720 17 30 47 75 120 192 240 304<br />
40 960 23 35 57 90 145 180 228<br />
50 1200 27 45 72 115 145 182
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