Solar EV Charging: How Many Solar Panels Do You Need to Charge an EV?
Estimate your EV's daily energy use, then size panels for your location. Here's a simple method you can do in five minutes.
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Key takeaways
- Daily kWh = daily miles ÷ miles per kWh.
- Panel output varies by location — use NREL's PVWatts for your address.
- Solar-aware chargers can charge only on surplus production.
Step 1: Your EV's daily energy
Divide your average daily miles by your car's efficiency. Many EVs travel about 3–4 miles per kWh, so 35 miles a day needs roughly 9–12 kWh. FuelEconomy.gov lists official efficiency ratings for every EV.
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Step 2: Your panels' output
A panel's daily output depends on its wattage, your latitude, roof angle and shading. NREL's free PVWatts calculator estimates production for your exact address — enter a 1 kW system to see daily kWh per kW installed, then divide your EV need by that number.
Step 3: Charge when the sun shines
If your car is home during the day, a solar-aware charger can follow surplus production. If not, net metering or a home battery lets daytime solar offset nighttime charging.
Safety note: This article is general information, not professional electrical advice. Working with 240V circuits can cause serious injury or fire. Hire a licensed electrician and follow local codes and permit requirements.
Sources & further reading
Written by
LarryLeoLarryLeo started EV Charging while researching his own next car purchase. He digs into the pros, cons and real cost savings of going electric — using government, standards-body and manufacturer sources — and shares what he finds so other buyers can decide with confidence.
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