Solar Cable Charts

MINIMUM Recommended Cable Size (cross section area of two core cable) for:
Twelve Volt (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:
Twenty Four Volt (24V) 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)
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



Cable sizes indicate the minimum recommended cross section area of two core cable in mm2.
AWG size comparisons

Many companies will supply cable using AWG sizes (American Wire Gauge - Refers to the strength of the wires). The table below indicates the closest AWG size equivalent to our European cross section sizes.

Please Note: The gauges most widely used and readily available are even number rated; where the above table gives an odd number rating, choose the next lower even number.
For example 15.0 mm2 is equivalent to AWG 5, but you would most likely need to buy AWG 4

Cross Section mm2 AWG
0.5 mm2 20
1.0 mm2 17
1.5 mm2 15
2.0 mm2 14
2.5 mm2 13
3.0 mm2 12
3.5 mm2 12
4.0 mm2 11
5.0 mm2 10
6.0 mm2 9
10.0 mm2 7
15.0 mm2 5
20.0 mm2 4
25.0 mm2 3
30.0 mm2 2
35.0 mm2 2
40.0 mm2 1
50.0 mm2 0
55.0 mm2 00