Solar + EV integration, 60 tools
How much solar does your EV actually need?
Charging an EV at home adds real load to a solar system that most sizing tools never account for. These calculators handle charging cost, charge time, panel count, and payback for one EV, two EVs, or a household that's about to add its first. Start with the whole-home baseline in the solar panel calculator, then add the EV load on top of that number.
Start here
The tool most people run first
Sizing basics
Start with your EV load
Charging speed and timing
How fast you can charge from solar
Cost comparisons
What charging actually costs
Payback and ROI
See the long-term return
Rebates, financing, and install cost
Cut the upfront cost
Household and vehicle scenarios
Match sizing to your setup
Equipment and grid interaction
Wiring, panels, and grid rules
Seasonal patterns
Account for the time of year
Questions
Frequently asked
Most single-EV households need 5 to 9 extra panels, depending on daily miles driven and the vehicle's efficiency. The EV charging load addition calculator gives an exact count from your own commute and panel wattage. Efficiency figures by model come from the EPA ratings on fueleconomy.gov.
Yes, in almost every US market, since self-generated solar power avoids the retail electricity rate entirely. The solar vs grid cost comparison shows the dollar difference for your own rate and mileage. The bill offset percentage calculator shows how much of that bill solar actually covers.
A battery lets you store daytime solar output and use it to charge after sunset, instead of pulling from the grid at night. See the charging time with battery storage tool and the off-peak charging tool for the timing math. The Department of Energy's Energy Saver guidance covers how home batteries store daytime solar for evening use.
V2H, vehicle-to-home, lets your EV's battery power your house during an outage or a peak-rate period. Payback depends heavily on your local outage frequency and rate structure. Run the V2H payback calculator with your own numbers before deciding.