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Solar Cable Charts

MINIMUM Recommended Cable Size (cross section area of two core cable) for:
12V Renewable Energy Systems: Keeping Voltage Loss under 5%
Maximum Watts from Solar Panel/Array 1 Meter (3.28 Feet) 3 Meters (9.84 Feet) 5 Meters (16.4 Feet) 10 Meters (32.8 Feet) 15 Meters (49.21 Feet) 20 Meters (65.61 Feet)
20 Watts 0.5 mm2 0.5 mm2 1.0 mm2 1.5 mm2 2.0 mm2 2.5 mm2
30 Watts 0.5 mm2 0.5 mm2 1.0 mm2 2.0 mm2 2.5 mm2 3.5 mm2
36 Watts (= 3 Amps) 0.5 mm2 1.0 mm2 1.0 mm2 2.5 mm2 3.0 mm2 4.0 mm2
40 Watts 0.5 mm2 1.0 mm2 1.5 mm2 2.5 mm2 3.5 mm2 5.0 mm2
50 Watts 0.5 mm2 1.0 mm2 1.5 mm2 3.0 mm2 5.0 mm2 6.0 mm2
60 Watts 0.5 mm2 1.0 mm2 2.0 mm2 3.5 mm2 5.0 mm2 10.0 mm2
72 Watts (= 6 Amps) 0.5 mm2 1.5 mm2 2.0 mm2 4.0 mm2 6.0 mm2 10.0 mm2
80 Watts 0.5 mm2 1.5 mm2 2.5 mm2 5.0 mm2 10.0 mm2 10.0 mm2
90 Watts 0.5 mm2 1.5 mm2 2.5 mm2 5.0 mm2 10.0 mm2 10.0 mm2
100 Watts 1.0 mm2 2.0 mm2 3.0 mm2 6.0 mm2 10.0 mm2 15.0 mm2
120 Watts (= 10 Amps) 1.0 mm2 2.0 mm2 3.5 mm2 10.0 mm2 10.0 mm2 15.0 mm2
192 Watts (= 16 Amps) 1.5 mm2 3.5 mm2 6.0 mm2 15.0 mm2 20.0 mm2 25.0 mm2
288 Watts (= 24 Amps) 2.0 mm2 5.0 mm2 10.0 mm2 20.0 mm2 25.0 mm2 35.0 mm2
360 Watts (= 30 Amps) 2.0 mm2 6.0 mm2 10.0 mm2 20.0 mm2 30.0 mm2 40.0 mm2
480 Watts (= 40 Amps) 3.0 mm2 10.0 mm2 15.0 mm2 30.0 mm2 40.0 mm2 55.0 mm2



Cable sizes indicate the minimum recommended cross section area of two core cable.

Please see the 24 volt cable chart and AWG size comparisons below.


MINIMUM Recommended Cable Size (cross section area of two core cable) for:
24V Renewable Energy Systems: Voltage Loss under 5%
Maximum Watts from Solar Panel/Array 1 Meter (3.28 Feet) 3 Meters (9.84 Feet) 5 Meters (16.4 Feet) 10 Meters (32.8 Feet) 15 Meters (49.21 Feet) 20 Meters (65.61 Feet)
40 Watts 0.5 mm2 0.5 mm2 0.5 mm2 1.0 mm2 1.0 mm2 1.5 mm2
72 Watts (= 3 Amps) 0.5 mm2 0.5 mm2 0.5 mm2 1.0 mm2 1.5 mm2 2.0 mm2
144 Watts (= 6 Amps) 0.5 mm2 1.0 mm2 1.0 mm2 2.0 mm2 3.0 mm2 4.0 mm2
240 Watts (= 10 Amps) 0.5 mm2 1.0 mm2 2.0 mm2 3.5 mm2 5.0 mm2 10.0 mm2
360 Watts (= 15 Amps) 0.5 mm2 1.5 mm2 2.5 mm2 5.0 mm2 10.0 mm2 10.0 mm2
480 Watts (= 20 Amps) 1.0 mm2 2.0 mm2 3.5 mm2 10.0 mm2 10.0 mm2 15.0 mm2
720 Watts (= 30 Amps) 1.0 mm2 3.0 mm2 5.0 mm2 10.0 mm2 15.0 mm2 20.0 mm2
960 Watts (= 40 Amps) 1.5 mm2 4.0 mm2 10.0 mm2 15.0 mm2 20.0 mm2 30.0 mm2

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