Solar Panels for EV Charging Calculator
Estimate how much rooftop solar it takes to offset your EV's charging. Enter your annual miles, efficiency, and local sun hours to size the solar capacity and number of panels that generate roughly as much energy each year as your car uses.
Home Level 2 chargers
Daytime charging at home is what lets solar output go into the car rather than back to the grid. Most non-Tesla EVs built before 2025 have a J1772 port; a NACS car takes the wall charger's NACS version. The portable unit plugs into an existing 14-50 outlet on a 50 A circuit with no install. It is J1772-only.
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Smart charger
Emporia Classic EV Charger
Best for: Best value in a 48 A smart charger, and tight panels via PowerSmart
Portable charger
Lectron Portable Level 2 J1772 Charger (NEMA 14-50)
Best for: Renters and second homes with an existing 14-50 outlet
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Sources & standards
This tool's methodology and data follow US standards and authoritative public datasets: