List what runs in your van on a typical day. Compare direct DC use, AC appliances, and the energy the inverter uses while idle.
Camper Van Daily Energy Use Calculator
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How it works
Multiply each appliance’s watts by its hours per day. Divide AC energy by inverter efficiency, then add any idle draw separately. Daily amp-hours are watt-hours divided by nominal battery voltage.
Reference: Victron’s Wiring Unlimited: DC wiring.
What to check before you use the result
Use measured average watts for cycling loads such as a fridge. Count idle hours separately only if the inverter overhead is not already included in your measurements.
