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Fuse Sizing Calculator

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EXPLORIST.life Electrical

EXPLORIST.life Electrical

Fuse Sizing Calculator

This calculator will help you determine an approximate fuse size based on the circuit amperage when the wire size is already given or known. This calculator does not supersede manufacturer recommendations.

Enter the amperage of the circuit here.

Enter the wire size used here.

Is this wire installed in an engine compartment?

If this circuit is part of a bundle of wires, how many current carrying conductors (excluding ground or communication wires) are part of this bundle?

Minimum Fuse Size 10 A
Recommended Fuse Size 15 A
Max Fuse Size 37 A

Note: The recommended fuse size is larger than the max fuse size — this wire may be too small for the amperage demands of this circuit.

Need a fuse or breaker to match your results?

Class T · ATO/ATC · MRBF · ANL · MEGA · PV Fuses

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Still have questions? Our wiring kits already have the fuse sizes and wire sizes figured out for you — skip the guesswork and go straight to installing.

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Nate Yarbrough

Nate Yarbrough specializes in teaching people how to build DIY Campers. Since 2018, Nate has focused on DIY Solar Electrical Systems to bring more user-friendly information to the general public. Nate is a brand ambassador and trainer for Victron Energy and Battle Born Batteries, with whom he partners in order to create simple-to-follow tutorials for the DIY Solar Electrical user. Nate and his wife, Steph, built out their own 2007 Sprinter into a campervan, which they then lived in with their two dogs for 4 years. They have since moved to Steamboat Springs, Colorado, where they continue to create tutorials for the vanlife DIYer, while enjoying the beauty of nature by hiking, biking, skiing, and horseback riding in the mountains.
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The EXPLORIST.life shop has everything you need for  your DIY camper electrical upgrade, retrofit, or complete system.

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