Plan Your Van or RV Power System in Minutes
Model a typical 24-hour day, compare solar conditions, and see how appliance loads, battery storage, alternator charging and shore power work together.
Enter Your System
Battery and solar
Inverter and charging
Daily appliances
Use measured watts when possibleYour 24-Hour Energy Picture
Planning checks
Planning estimate only. Actual performance changes with weather, temperature, shading, wiring losses, charger limits, battery settings and appliance behavior. Verify the final system against current manufacturer documentation and qualified guidance. This tool does not select wire or fuse sizes.
How to Get a Useful Result
- Use measured appliance wattage and realistic daily run time.
- Choose DC for loads powered directly by the battery and AC for loads powered through the inverter.
- Enter motor or compressor surge only as a documented planning value.
- Run sunny, cloudy and no-solar scenarios before relying on one favorable day.
What This Model Can—and Cannot—Do
The simulator estimates daily energy flow and compares charging scenarios. It does not approve a battery, inverter, wire, fuse, solar controller or installation.
Its LiFePO4 and lead-acid reserve settings are transparent planning assumptions, not universal manufacturer limits. Temperature, battery-management behavior and equipment settings still matter.
Power Simulator Questions
Does this recommend an exact battery size?
No. Battery choice must also account for maximum current, temperature, reserve requirements, charging limits, cycle life, installation and the exact battery manual.
Why are AC and DC appliances calculated differently?
A DC appliance is supplied directly by the DC system. An AC appliance also passes through the inverter, so the model includes the entered inverter-efficiency loss and checks the inverter’s running and surge ratings.
Can it choose fuse and wire sizes?
No. Fuse and conductor selection depends on ampacity, insulation, installation method, terminals, temperature, circuit length, equipment requirements and applicable standards.
Why can a balanced day still show a low battery point?
Total charging may exceed consumption while energy arrives at the wrong time. Loads used before meaningful solar production can lower the battery first, with charging recovering it later.
Are the results guaranteed?
No. Results are educational estimates based on user inputs and simplified assumptions. They are not an electrical design, installation instruction, certification or substitute for professional review.