Field guides

Plan the system before you buy the parts.

Each guide works from manufacturer manuals and published standards toward a decision you can act on, and says plainly where it stops. None of them replaces the manual for the exact part you install.

01Conversion field guideLead-acid to LiFePO₄ conversion guidePlan a lead-acid to LiFePO₄ conversion: audit charge sources, alternator, BMS, protection, cables and monitor before replacing the bank.Reviewed Aug 28, 2026Sources 12 manufacturer and standards documents

Tools

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Calculators that check one number at a time.

Battery protection tool

LiFePO₄ fuse size calculator

Check a LiFePO₄ fuse candidate against bidirectional current, surge, cable ampacity, DC voltage and fault current—without guessing from amp-hours.

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.