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How to Charge Your EV With Solar Panels: Setup & Costs
Quick answerCharging an EV from your own solar panels gives you the cleanest and often cheapest kilometres you can drive.
Data note: figures are approximate and come from the sources listed at the end. Prices, ranges and rules change often, so confirm with the manufacturer or the official body before you decide. Last reviewed Oct 30, 2026.
How much solar do you need?
\text{Annual kWh} = \frac{\text{km per year}}{100} \times \text{kWh per 100 km}
| Annual distance | Consumption (17 kWh/100 km) | Annual kWh needed | Approx. panels (400 W each, ~1,000 kWh/kW/yr) |
|---|---|---|---|
| 8,000 km | 1,360 kWh | 1,360 | ~4 panels |
| 12,000 km | 2,040 kWh | 2,040 | ~5–6 panels |
| 20,000 km | 3,400 kWh | 3,400 | ~8–9 panels |
Yields depend on location: sunny regions need fewer panels, northern ones more.
Four ways to set it up
| Setup | How it works | Pros | Cons |
|---|---|---|---|
| Standard charger + grid | Charge whenever; solar offsets house use | Simple | Often charges when sun is absent |
| Solar-aware smart charger | Adjusts charging to surplus solar | Maximises self-use | Slightly higher charger cost |
| Solar + home battery | Stores daytime solar for evening charging | Higher self-sufficiency | Expensive |
| Bidirectional (V2H) | The car acts as the battery | Uses the EV as storage | Needs a compatible car and charger |
See vehicle-to-home explained.
Matching sun and charging time
- If the car is home during the day, charge at midday directly from the panels.
- If it is away during the day, charge from a home battery or use cheap night tariffs (green electricity tariffs); solar surplus is still exported or credited.
- Smart chargers can pause when clouds pass and resume with sun.
What it costs (approximate)
| Item | Typical range |
|---|---|
| Panels + inverter, installed (per kW) | ~1,000–2,000 USD/EUR |
| Smart EV charger | ~600–1,500 |
| Home battery (optional) | ~4,000–10,000+ |
| Payback | Often 6–12 years, shorter with high electricity prices |
Savings example
\text{Annual saving} = \text{kWh from solar} \times (\text{grid price} - \text{export price})
2,000 kWh × (0.25 − 0.08) ≈ 340 per year in currency units, plus fuel savings versus gasoline.
Tips
- Size the system for the whole home plus the EV.
- Choose a charger that can limit current to surplus solar.
- Check local net-metering and export rules.
- Consider a battery only after the basics, since the car itself is a large battery.
- Check roof orientation and shading before quoting.
More on chargers: EV charging guide.
Environmental benefit
Rooftop solar has a lifecycle footprint of roughly 20 to 50 g CO₂e per kWh, far below the average grid in most countries, putting your EV's driving emissions at only a few grams per kilometre. See Are Electric Cars Really Green?
FAQ
Can I charge an EV only with solar?
Yes, with enough panels, but you still need the grid or batteries for cloudy periods and nights.
How many panels to charge an EV?
Typically 4 to 10 for average driving.
Is it worth it?
Often yes, especially with high electricity prices and daytime charging.
Where to verify these figures
For solar yields in your area see the NREL PVWatts calculator (US) or your national energy agency, and get at least three installer quotes.