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What section should my battery cables have?

The wiring between battery and charger or inverter has to match the highest current possible. Thin cables get hot on high currents and cause a voltage loss. The voltage supplied to the battery is lower and charging takes more time.

The optimal diameter for the cable is:
charge or discharge current x 0,25 x metres cable

For example for a 50A charger with 2 metres of cable this is:
50 x 0,25 x 2 = 25mm².

When choosing between different standard diametres always take the thicker one.

This table gives an indication on the size of battery cables.