Wire Size Calculator

including Switches, Relays & Fuses

This wire size calculator does NOT supersede manufacturers recommendations.

DISCLAIMER! Mowgli Adventures has made every effort to ensure that the results generated by the wire size calculator are correct and valid.

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Installing enough solar panels and an appropriately sized solar charge controller will help you maximize how much solar electricity you can generate. 

The Anatomy of a Wire A wire is made up of insulation – the plastic sheath – and the conductor – the metal strands inside the insulation.

Why is it Important to Use the Proper Wire Size? Electrical wire has a certain amount of resistance, resulting in an amount of voltage drop from one end to another.

Wire Length Electrical current transmits through the wire, but the longer the wire, the greater the resistance and the greater the voltage drop.

Temperature As current flows through a wire, the resistance generates heat. If the wire is too small for the current passing through it, the wire may get so hot it causes a fire.

High Current Components We recommend going up one wire size for heavy current components like inverters, heaters, and water heaters.

From the anatomy of  the wire to the importance of choosing the proper wire size, we got you covered! Swipe up for the full guide.