Interactive planning tool

Diesel Heater Battery Runtime Calculator

Estimate 12V runtime while preserving a sensible battery reserve.

Battery capacity (Ah)Usable depth (%)Average heater draw (A)Reserve (%)

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How to use the result

Treat the output as a planning estimate. Heater labels, real burn rates, battery condition, altitude, weather, and installation details vary. Verify specifications for the exact equipment and leave a safety margin.