How many solar panels to charge an electric car?
Enter how far you drive in a day and pick your car (or enter its efficiency). The calculator turns miles into kWh using the EPA figure and sizes the panels to make that much on an average day.
Enter your measurements
More options: Losses
- Solar array needed
- 1,910 W
- Charging energy per day
- 7.4 kWh
- Charging energy per year
- 2,698 kWh
- Driving per panel per day
- 6.3 miles
30 mi × 24.6 kWh per 100 mi ÷ 100 = 7.4 kWh a day
7.4 kWh ÷ (4.5 sun h × 86%) = 1,910 W → 5 panels of 400 W
- This sizes panels to make the car’s energy over a day. The car only charges from them directly if it is plugged in while the sun shines; otherwise the grid (with net metering) or a home battery bridges the gap.
Quick answers for common sizes
| Example | Answer |
|---|---|
| How many solar panels to charge a Tesla Model 3 | 5 × 400 W panels (1,910 W) for 30 miles a day |
| How many solar panels to charge a Tesla Model Y | 6 × 400 W panels (2,232 W) for 30 miles a day |
Panels for each car at the distance above
| Car | Charging energy per day | Solar array needed | Panels |
|---|---|---|---|
| 2025 Tesla Model 3 Long Range RWD | 7.4 kWh | 1,910 W | 5 panels |
| 2025 Tesla Model Y Long Range AWD | 8.6 kWh | 2,232 W | 6 panels |
| 2025 Nissan Leaf | 9.1 kWh | 2,359 W | 6 panels |
| 2025 Chevrolet Equinox EV FWD | 9.4 kWh | 2,422 W | 7 panels |
| 2025 Ford F-150 Lightning 4WD ER1 | 14.4 kWh | 3,714 W | 10 panels |
Worked examples: how many solar panels to charge a Tesla Model 3 and how many solar panels to charge a Tesla Model Y.
How it is worked out
kWh per day = miles per day × kWh per 100 miles ÷ 100 array W = kWh per day × 1,000 ÷ (peak sun hours × (1 − losses)) panels = array W ÷ panel W, rounded up
The EPA’s combined efficiency figure on fueleconomy.gov is measured as electricity taken from the wall, so charging losses are already in it. That makes it the right number for sizing panels — better than the car’s own trip computer, which usually reports energy at the battery.
| Car (2025) | kWh per 100 miles | kWh for 30 miles | 400 W panels at 4.5 sun hours |
|---|---|---|---|
| Tesla Model 3 Long Range RWD | 24.6 | 7.4 | 5 |
| Tesla Model Y Long Range AWD | 28.8 | 8.6 | 6 |
| Nissan Leaf | 30.4 | 9.1 | 6 |
| Chevrolet Equinox EV FWD | 31.2 | 9.4 | 7 |
| Ford F-150 Lightning 4WD ER1 | 47.9 | 14.4 | 10 |
Things to plan around
- When the car is home. If it is at work all day, solar panels at home can’t charge it directly. Grid-tied systems with net metering credit daytime production against evening charging.
- Winter. Range and efficiency fall in the cold, and so does solar output. Size on the season that matters to you.
- Charger and circuit. A Level 2 charger is a large, continuous load that needs its own properly sized circuit, installed by a licensed electrician.
- Off-grid EV charging needs a big battery and inverter, because a Level 2 charger draws several kilowatts for hours.
What you’ll need
- 400 W residential-size solar panelPremium price
Fewer, larger panels for a cabin, shed or ground mount. Their higher voltage usually means an MPPT controller.
See options on Amazon (opens in a new tab) - Plug-in electricity usage monitorBudget price
Plugs in between the wall and a 120 V appliance and shows real watts and kWh over a day — the honest way to fill in a load list, especially for fridges that cycle on and off.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How many solar panels does it take to charge a Tesla?
For a 2025 Model 3 Long Range RWD (24.6 kWh per 100 miles, EPA) driven 30 miles a day, about 7.4 kWh a day — about 1,910 W of panels, five 400 W panels, at 4.5 peak sun hours. See how many solar panels to charge a Tesla Model 3.
How many kWh does an electric car use per mile?
Most 2025 EVs on fueleconomy.gov use roughly 0.25–0.31 kWh per mile combined; a full-size pickup like the F-150 Lightning about 0.48.
Can a solar panel charge an electric car directly?
Only if the car is plugged in while the sun shines and the system is designed for it. Many home systems are grid-tied: the panels offset the car’s energy over the year and the grid handles the timing.
How long does it take to charge an EV with one solar panel?
A 400 W panel makes about 1.5 kWh on a 4.5-sun-hour day after losses — about 6 miles of driving in a Model 3. Solar adds miles a panel at a time, not a full battery in an afternoon.
Sources
- U.S. DOE / EPA — fueleconomy.gov vehicle data (opens in a new tab) — EPA combined electricity use in kWh per 100 miles, measured at the wall outlet (charging losses included).
- National Laboratory of the Rockies (formerly NREL) — PVWatts® Calculator (opens in a new tab) — Look up the solar resource (peak sun hours) and yearly output for your own address; default system losses 14%.
- NLR (formerly NREL) — PVWatts® v8 API, NSRDB PSM V3 TMY data (opens in a new tab) — City figures on this site: fixed open-rack array facing due south, tilted at the site’s latitude, 14% system losses, queried October 2026.