Appendices
76
2% Voltage Drop Charts for 75°C Solid Copper Wire
1-Way Wire Distance (feet), 12 Volt System
Wire Size
(AWG)
40A
35A
30A
25A
20A
15A
10A
5A
2/0 *
41.7
47.7
55.6
66.7
83.4
111.2
166.8 333.6
1/0 *
33.1
37.8
44.1
52.9
66.1
88.2
132.3 264.6
2
20.8
23.8
27.7
33.3
41.6
55.4
83.2
166.3
4
13.1
14.9
17.4
20.9
26.2
34.9
52.3
104.6
6
8.2
9.4
11.0
13.2
16.5
21.9
32.9
65.8
8
5.2
5.9
6.9
8.3
10.3
13.8
20.7
41.4
10
3.3
3.7
4.3
5.2
6.5
8.7
13.0
26.0
12
2.0
2.3
2.7
3.3
4.1
5.5
8.2
16.4
14
1.3
1.5
1.7
2.1
2.6
3.4
5.1
10.3
Table C-3. Maximum 1-way wire distance for 12 Volt systems, solid
copper, 2% voltage drop
1-Way Wire Distance (meters), 12 Volt System
Wire Size
(mm
2
)
40A
35A
30A
25A
20A
15A
10A
5A
70 *
12.71 14.53 16.95 20.34 25.42 33.90
50.85 101.69
50 *
10.08 11.52 13.44 16.13 20.16 26.88
40.32
80.64
35
6.34
7.24
8.45
10.14 12.68 16.90 25.35
50.70
25
3.99
4.56
5.32
6.38
7.97
10.63 15.95
31.89
16
2.51
2.87
3.34
4.01
5.01
6.69
10.03
20.06
10
1.58
1.80
2.10
2.52
3.15
4.21
6.31
12.62
6
0.99
1.13
1.32
1.59
1.98
2.64
3.97
7.93
4
0.62
0.71
0.83
1.00
1.25
1.66
2.50
4.99
2.5
0.39
0.45
0.52
0.63
0.78
1.05
1.57
3.14
Table C-4. Maximum 1-way wire distance for 12 Volt systems, solid
copper, 2% voltage drop