Solar Panels for EV Calculator
Find out exactly how many solar panels you need to fully charge your electric car at home — with cost estimates and payback period.
Your EV
Location & System
Energy Breakdown
Financial Summary
Why 6 Panels?
Your Tesla Model 3 Standard Range needs 10.28 kWh per day for 40 miles. In California with 5.8 peak sun hours, each 400W panel generates about 2.0 kWh/day after accounting for 14% system losses. That works out to 6 panels for a 2.4 kW system.
How Solar EV Charging Works
Pairing rooftop solar with an electric vehicle is one of the smartest financial moves a homeowner can make in 2026. Instead of paying your utility to charge your car, your panels generate that electricity for free — directly from sunlight. The two technologies amplify each other: solar panels cut your electricity bill while your EV eliminates your gas bill.
The number of panels you need depends on four variables: how many miles you drive each day, how efficient your EV is, how many peak sun hours your state receives, and the wattage of your chosen panels. Our calculator combines all four to give you a panel count tailored to your situation.
Factors That Affect Panel Count
EV efficiency is the biggest driver. A Ford F-150 Lightning uses nearly twice the electricity per mile as a Hyundai Ioniq 6, so it needs roughly twice the solar capacity to cover the same daily mileage. Trucks and large SUVs require significantly more panels than compact sedans.
Peak sun hours vary dramatically by state — Arizona averages 6.5 hours while Alaska averages just 3.0. A homeowner in Phoenix needs about half the panels a similar driver in Anchorage would need for the same mileage. High-sun states like Arizona, Nevada, and New Mexico see the best economics for solar EV charging.
Panel wattage matters too. Upgrading from 350W to 500W panels means each panel generates more power, so you need fewer of them — though higher-wattage panels cost more individually. For most rooftops, 400W panels hit the sweet spot of cost and output.
The Financial Case for Solar EV Charging
With the federal 30% Investment Tax Credit still in place for 2026, a dedicated EV-charging solar system typically pays for itself in 6–10 years — after which your EV charging is effectively free for the remaining 15+ years of panel life. In high-electricity-rate states like California, Connecticut, and Hawaii, the payback can be as short as 4–5 years.
Beyond savings, solar EV charging reduces your carbon footprint by an average of 0.855 lbs of CO₂ per kWh compared to grid-charged EVs (EPA estimate). For a driver covering 40 miles per day, that can mean avoiding over 4,000 lbs of CO₂ annually — equivalent to planting roughly 50 trees.
For a broader view of your solar investment, explore our Solar Panel ROI Calculator, which models full-home solar savings. To understand your overall EV costs, the EV Charging Cost Calculator shows how much you spend charging today, and the Solar Savings by State pages break down incentives and ROI for all 50 states.