Cable Size Calculator


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Calculates the minimum cable size needed for a specific length to avoid voltage losses. Enter the voltage running through the cable (V), the current running through the cable (A), the total length of cable needed (m) and also the maximum permissible percentage voltage loss (%V), typically 2.5%, then hit 'calculate'. Results are shown in mm2 cross-sectional area.

Voltage through cable (e.g. 17.5V for 1 x 100W panel):
 V
Current through cable (e.g. 5.76A for 1 x 100W panel):
 A
Total length of cable in metres:
 m
Maximum voltage loss (typically 3%):
 %
Cable size =  mm2