See what a charger would draw from the starter side, then estimate how much it could deliver on a drive.
DC-to-DC Charger Sizing Calculator
← All camper van tools
How it works
Output watts divided by input volts and charger efficiency gives input amps. Estimated house-side current is capped by the charger setting, the entered spare input current, and the battery’s charge limit.
Reference: Victron’s Orion XS input and output current settings.
What to check before you use the result
Enter spare current approved for the vehicle at the intended conditions, after factory loads. An alternator’s nameplate amperage is not its spare output. Charging can taper and the battery may reach full charge before the drive ends.
