Morningstar ProStar MPPT Manual

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