Work out the continuous AC load your inverter must carry and the peak it may see when one appliance starts.
Camper Van Inverter Sizing Calculator
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How it works
Add the running watts of appliances you expect to use together. For a one-at-a-time start, add the largest difference between startup and running watts to the total. Apply your margin to the continuous load.
Reference: Victron’s Wiring Unlimited: DC wiring.
What to check before you use the result
Use measured or manufacturer startup watts and compare the inverter’s surge duration and VA rating as well as watts. If loads start together, enter them as a single combined row. Check battery and wiring limits separately.
