In a solid cable you can calculate the surface area if you measure the diameter of the cable core, but in a stranded cable this might not possible. (Please note that we do not recommend using solid core cables).
Surface area = π x raduis 2 Surface area = π x (diameter/2) 2 A = π x (d/2) 2
If you cannot find the right cable, double up. Use two cables per connection, rather than one very thick one. But the combined surface area of both cables has to be equal to the recommended surface area. For example, 2 x 35 mm 2 cables equals a 70mm 2 cable. Our bigger inverter/chargers have 2 connections for positive and negative in our larger units. It is okay to double up cable
Use as short as possible cable lengths Avoid these mistakes:
• Don’t use cable with course strands • Don’t use non-flexible cable • Don’t use AC cable • For marine use marine rated cable. This is cable with tin coated copper strands
Marine cable
Calculating cable thickness, yourself is hard, so we help you with selecting the correct cable thickness. There are several options: • Look in the product manual • The Victron toolkit app • The rule of thumb • Recommended battery cables document
Product manuals All our manuals recommend the battery cable size (and fuse size) that needs to be used for the product.
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