Tool 11 · Solar + EV
How many solar panels to charge an EV?
Turn EV miles into annual kWh, then estimate the extra solar system size and panel count needed to cover that driving load at home.
Use this free solar and EV calculator to estimate the extra solar capacity needed to cover an electric vehicle's driving load. Enter monthly miles, EV efficiency, solar output and panel wattage for an instant panel-count estimate.
No email required. Instant browser-based planning math with clear assumptions.
EV load is often the missing solar input
An EV can add thousands of kWh a year. If you size solar from last year's utility bill before buying the car, the system may be too small for the new driving load.
Annual energy matching is not simultaneous solar charging: night charging may still require grid energy or storage, and export/import prices differ. The yield is a user-supplied roof scenario, not a location simulation. For the whole house, add EV wall energy to your existing monthly kWh in the panel count calculator.
What this tool estimates
Use this free solar and EV calculator to estimate the extra solar capacity needed to cover an electric vehicle's driving load. Enter monthly miles, EV efficiency, solar output and panel wattage for an instant panel-count estimate.
No email required. Results are calculated in your browser; use them as a planning estimate, not a guaranteed quote or savings forecast.
How the math works
EV consumption and its measurement basis determine annual wall energy, including charging loss once. Divide by the user-supplied roof yield, then round up to whole panels. This matches annual energy only, not simultaneous solar charging, grid independence or a utility-bill offset. Household use is separate.
Key variables that change your result
EV miles and efficiency
Driving distance and kWh per 100 miles determine the annual electricity load added by the vehicle.
Solar production
A system's annual kWh per installed kW changes with location, roof direction, shade, tilt and weather.
Panel wattage
Panel wattage changes panel count, but final roof fit also depends on layout, setbacks and usable roof area.
Questions homeowners ask
How many solar panels do I need to charge an EV?
Does solar charging cover my whole house too?
Can solar panels charge an EV at night?
State context matters
Find your state solar guide
Costs, incentives, export rules and payback inputs vary by state. Open your state guide before treating any calculator result as a buying decision.