Need to work out Volt Drop for your cable run?  Here is a useful Volt Drop Calculator you can try ... Or from the table below calculate by Amps x Meters x Volt Drop (from table) ie.  25M 6mm cable running 60V with 20A you would do 20A x 25M x 7.9 = 3950mV = 3.9V drop. So 60V - 3.9V = 56.1V

Cable sizes: Free Air cables can carry the following Amps (cables in conduit or insulated walls will reduce the Amps you can put through the cable).  The table below shows our recommended max amps to put though the DC solar and battery cable sizes we supply in Free Air and In Ducts, if in insulated walls you will need to reduce further.  The amount in brackets is the absolute max and must never be exceeded. The 6 and 10mm refer to solar cable. The remaining sizes refer to battery cable.

Cable Size Max Amps in Free Air In Duct

Volt Drop


6mm 70A    3.39
10mm 98A    1.95
16mm 94A (115Max) 80A (91Max) 2.9
35mm 150A (188Max) 115A (139Max) 1.35
50mm 190A (228Max) 140A (164Max) 0.98
70mm 260A (291Max) 180A (203Max) 0.67
95mm 325A (354Max) 200A (239Max) 0.49

The information contained within this table is for guidance only and is subject to change without notice or liability. All the information is provided in good faith and is
believed to be correct at the time of publication. When selecting cable accessories, please note that actual cable dimensions may vary due to manufacturing tolerances.


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