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Calculators

Check a number before you commit to it.

Each tool takes the inputs the decision really depends on and shows its working, including which missing input prevents an answer. None of them checks a rating you have not entered.

  1. 01Battery protection toolLiFePO₄ fuse size calculatorCheck a LiFePO₄ fuse candidate against bidirectional current, surge, cable ampacity, DC voltage and fault current—without guessing from amp-hours.Reviewed Aug 28, 2026Sources 10 manufacturer and standards documents

Guides

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The longer-form context behind these checks.

Conversion field guide

Lead-acid to LiFePO₄ conversion guide

Plan a lead-acid to LiFePO₄ conversion: audit charge sources, alternator, BMS, protection, cables and monitor before replacing the bank.

Next referenceDraw the system these pages describePlace the real parts on a canvas and let the engine size every cable and fuse against ABYC E-11, instead of reading a size off a page written for someone else's boat.