Online Calculator

DC Power Cable Sizing – Online Calculator

Our online cable or wire size calculator tool makes it easy to establish the correct size of cables for any DC power system.

Please feel welcome to bookmark/digg/xmark this page now and have access to the tool whenever you need it – share it with friends, colleagues, anyone who has to deal with DC electrical cables.

Cable sizes are particularly important for low voltage battery cables, solar panels, wind turbines and load cables.

Voltage drops through incorrectly sized cables are one of the most common reasons for low voltage (12v, 24v or 48v) system faults. If the cable is far too small, it can be very dangerous as the cable will heat up and potentially cause a fire. Undersized cables also waste energy.

Conversely, too large a cable and you are simply wasting your money on good copper.

We hope you find the tool useful.

How To Use The Cable Size Calculator

To use the calculator:
  • 1 – Enter percentage cable loss acceptable [normally approx 2 or 3%].
  • 2 – Enter system voltage.
  • 3 – Enter max amps to be carried by the cable [amps = watts / voltage].
  • 4 – Enter max length of cable run required.
  • 5 – Click “Calculate” – results are shown in the closest standard metric & AWG cable sizes.