The short answer is it takes anywhere between 5 and 12 solar panels to charge an EV, but it depends on so many factors. For example, you would need six 360-watt panels getting 4.5 hours of sun per day to charge a Tesla Model Y that travels 37 miles per day.

To get this answer, we’ll need the number of miles traveled per day (the national average is 37) and the fuel efficiency rating of the EV. Simply take the MPGe (which the Environmental Protection Agency provides for all EVs) and divide it by 33.705.

Charging time depends on the type of charger and the battery capacity of the vehicle. A Level 1 charger takes 8-16 hours to fully charge, a Level 2 charger usually takes 6-8 hours, while a Level 3 DC fast charger can charge to 80% in about 30 minutes to 45 minutes.

Solar power is the cheapest charging option by a long shot. In fact, charging at home on solar power costs about half as much as charging on grid power, and five times less than fueling an EV at public chargers or a combustion car with gas.