Cable Size Calculator

Getting the right cable size is important. Get a cable that is too small for the current that you are carrying and you'll lose power through resistance. The longer your cable run, the greater the potential losses.

This simple calculator will help you identify the correct size of cable for a low-voltage DC current, as described in the section on wiring in the book Introducing Renewable Energy.

Metres Feet
Current (amps)
-or- Power (watts)