Morningstar ProStar MPPT Manual

Appendices
ProStar MPPT Operator’s Manual
75
APPENDIX C - Wire Sizing Charts
2% Voltage Drop Charts for 75°C Stranded Copper Wire
1-Way Wire Distance (feet), 12 Volt System
Wire Size
(AWG)
40A 35A 30A 25A 20A 15A 10A 5A
2/0 * 33.6 38.4 44.8 53.8 67.2 89.6 134.4 268.9
1/0 * 26.6 30.4 35.5 42.6 53.3 71.0 106.6 213.1
2 16.8 19.1 22.3 26.8 33.5 44.7 67.0 134.0
4 10.6 12.1 14.1 16.9 21.1 28.1 42.2 84.4
6 6.6 7.6 8.8 10.6 13.2 17.7 26.5 53.0
8 4.2 4.8 5.6 6.7 8.4 11.1 16.7 33.4
10 2.6 3.0 3.5 4.2 5.2 7.0 6.6 21.0
12 1.6 1.9 2.2 2.6 3.3 4.4 6.6 13.1
14 1.0 1.2 1.4 1.7 2.1 2.8 4.1 8.3
Table C-1. 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 * 10.24 11.71 13.66 16.39 20.49 27.32 40.98 81.95
50 * 8.12 9.28 10.83 12.99 16.24 21.65 32.48 64.96
35 5.11 5.84 6.81 8.17 10.21 13.62 20.42 40.85
25 3.22 3.68 4.29 5.15 6.43 8.58 12.87 25.73
16 2.02 2.31 2.69 3.23 4.04 5.38 8.07 16.14
10 1.27 1.46 1.70 2.04 2.55 3.40 5.09 10.19
6 0.80 0.91 1.07 1.28 1.60 2.13 3.20 6.39
4 0.50 0.57 0.67 0.80 1.00 1.33 2.00 4.00
2.5 0.32 0.36 0.42 0.50 0.63 0.84 1.26 2.52
Table C-2. Maximum 1-way wire distance for 12 Volt systems, solid
copper, 2% voltage drop