Calculate how much you can save by pairing solar panels with your EV. Estimate solar charging coverage, fuel savings, and payback period.
Pairing solar panels with your electric vehicle is the holy grail of home energy savings. With a typical 6 kW solar system generating about 7,200 kWh annually and an EV consuming roughly 4,600 kWh per year (13,500 miles driven), many homeowners can cover 60-100% of their EV charging needs with free solar energy.
The math is compelling: at the national average electricity rate of 18.56c/kWh, charging your EV from the grid costs about $850/year. With solar, that drops to near zero. Combined with the 30% federal solar tax credit and state-level EV incentives, the solar + EV pairing can save you $15,000-$25,000 over 10 years.
Check out our partner site SolarSavingsHome.com for a dedicated solar panel savings calculator!
This calculator estimates whether installing solar panels to charge your EV makes financial sense for your location, electricity rates, and driving habits. Here's how to use it:
Solar panel output depends heavily on your location. Arizona gets 6.5+ peak sun hours per day; New York gets 3.5-4.0. The calculator uses NREL's PVWatts data to estimate your solar production.
This helps size your solar system. A typical 3-bedroom home uses 900-1,200 kWh/month. If your bill is $150/month at 18.56¢/kWh, that's 808 kWh/month — a 7-8 kW solar system would cover most of that.
Your EV charging adds to your electricity consumption. If you drive 1,250 miles/month and your EV gets 3.4 miles/kWh, that's 368 kWh/month added to your bill — a 3-4 kW solar system just for the EV.
The calculator shows: (1) Recommended solar system size (kW), (2) Total installed cost (before federal tax credit), (3) Net cost (after 30% federal tax credit, which is still available for solar through 2032), (4) Monthly loan payment (if financing), (5) Monthly electricity savings, and (6) Payback period.
A typical EV driven 1,250 miles/month uses 368 kWh/month. Depending on your location's sun hours, this requires:
Takeaway: Covering your EV's electricity use requires a relatively small solar system (3-5 kW). Covering your entire home + EV typically requires 7-12 kW.
After the 30% federal tax credit (still available through 2032), solar costs:
State incentives: Some states offer additional solar incentives: California (NEM 3.0 export credits), Massachusetts (SMART program), New York (NY-Sun rebates), and others. These can reduce your net cost by another $1,000-5,000.
Net metering is a utility billing mechanism where you get credited for excess solar electricity sent to the grid. During the day (when you're at work and your solar panels are generating), the excess electricity flows to the grid and you get a credit. At night (when you charge your EV), you use those credits. This effectively gives you free EV charging if your solar system is sized correctly.
Net metering policies by state (2026):
For EV owners: Full net metering (or time-of-use export rates that favor daytime generation) is ideal because you can "bank" your midday solar production and use it to charge your EV at night.
Assumptions: 7 kW solar system, $21,000 installed cost, $14,700 after federal credit. 1,250 miles/month EV driving (368 kWh/month).
Is it worth it? 15-year payback is long. However, if electricity rates rise (they historically rise 2-4% per year), payback shortens to 10-12 years. Also, solar increases home resale value by approximately $15,000-20,000 (based on Zillow and Berkshire Hathaway Energy data).
Assumptions: 4 kW solar system (covers EV only), $12,000 installed cost, $8,400 after federal credit. 1,250 miles/month EV driving.
If your utility doesn't offer net metering, excess solar generation during the day is wasted (you don't get credited for it). In this case, you need "load matching" — using appliances during the day when solar is generating. For EV owners, this means:
Yes, if: (1) Your utility doesn't offer net metering (excess solar is wasted without battery), (2) You experience frequent power outages (battery provides backup power), (3) You want to charge your EV entirely from solar (even at night) for maximum environmental impact.
No, if: (1) Your utility offers full net metering (you get full credit for excess solar, so battery doesn't save money), (2) You don't care about backup power, (3) The solar battery payback period is too long for your taste (8-12 years).
A Tesla Powerwall (13.5 kWh capacity) can provide approximately 40-50 miles of EV range (depending on EV efficiency). To fully charge a 300-mile EV from battery alone, you'd need 6-8 Powerwalls — not practical. Instead, most solar + battery owners:
1. California: High electricity rates (32.6¢/kWh) + high gas prices ($5.58/gallon) + NEM 3.0 (time-of-use export rates) = solar pays back in 9-12 years. After payback, driving EV on solar is essentially free.
2. Arizona: Excellent sun hours (6.5+/day) + moderate electricity rates (15.2¢/kWh) + net metering available = solar pays back in 10-13 years.
3. Texas: No state income tax (solar loan interest is not deductible for most) + variable electricity rates + some utilities offer solar rebates = solar pays back in 11-14 years. Also, Texas has frequent summer outages (ERCOT grid stress) — batteries + solar provide valuable backup.
4. Florida: Excellent sun hours + no state income tax + net metering available (some utilities) = solar pays back in 11-14 years. However, Florida has high solar installation costs due to permitting and insurance requirements (hurricane resilience).
5. New York / Massachusetts: Low sun hours (4.0/day) but very high electricity rates ($0.28-0.35/kWh) + strong state solar incentives = solar pays back in 10-13 years. The high electricity rates make the savings case despite lower solar production.
1. Washington (state): Low electricity rates (11.9¢/kWh from hydropower) = very slow payback (18-22 years). However, Washington has excellent net metering and the environmental benefit is high (clean grid).
2. Louisiana: Low electricity rates (11.9¢/kWh) + no state solar incentives + net metering disputes = solar pays back in 20+ years. Not financially attractive, though EVs still save on gas vs electricity.
3. Alaska: Low sun hours in winter (0.5-1.5/day) + very high installation costs (shipping, labor) = solar is rarely cost-effective. However, summer sun hours are excellent (18+ hours of daylight), so seasonal solar production is possible with battery storage.
A typical EV driving 13,500 miles/year needs about 4,600 kWh annually. With modern 400W solar panels producing roughly 500 kWh/year each, you'd need about 9-10 panels (roughly a 3.6-4 kW system) just for your EV. A full 6 kW home solar system usually covers both the home and EV needs.
Yes! Through net metering, your solar panels send excess power to the grid during the day, and you draw from the grid at night when charging your EV. The credits offset each other, effectively letting you "charge with solar" without a home battery. Some states also offer time-of-use rates that make daytime charging cheaper.
With the 30% federal solar tax credit and fuel savings of $1,500-$2,500 per year (EV savings + solar electricity savings), a combined solar + EV investment typically pays back in 5-8 years. After that, you're driving on free sunshine for 20+ years.
Learn more about EV savings with our in-depth guides.