Here is a satisfied Volt owner using solar...
https://www.revisionenergy.com/solar-power-for-your-home/electric-vehicle-charging/
Some amazing facts:
Just 9 solar panels provide roughly enough electricity to power 12,000 miles of electric driving each year
Level II charging station delivers full vehicle battery charge in 4 to 8 hours depending on vehicle range
If you would otherwise drive a 20mpg vehicle, your solar electric panels charging your electric car will pay for themselves in around 2 years. Over 20 years, this will be like paying $0.32/gal for gasoline!*
One of our customers, who has a Volt, tells his story:
The Chevy Volt of Evan Sohm, owner of a solarized home in Londonderry, NH.
I drive from Londonderry, NH to Methuen, MA for work, Monday through Friday. It’s approximately a 37 mile round trip; the Volt will go approximately 40 miles on 10 kWh of charge. As a result, I’ve been driving the Volt to and from work without using any gas.
The PV solar panels on my roof produce 4 kW of power in full sun. So if the sun shines on my roof for 2.5 hours, that produces 10 kWh of energy which is enough to drive the car for 40 miles! On average our PV system produces 18.9 kWh/day. If you use all that energy to charge the Volt you could drive 75 miles per day with zero fuel expenses.
If we drove a regular car that gets 25 mpg for 75 miles, that would require 3 gallons of gas. So for us, it’s like our solar panels produce 3 gallons of gas per day, every day.
I couldn’t be happier, because in all honesty, I hate giving my money to the oil companies. Not only do I get to save money and help the environment, but I get to drive a really cool car! Everybody who takes a ride in it says it’s like a spaceship. But the Chevy Volt is not rocket science. It’s like any other regular car, only more efficient. So far, I’ve driven 7,000 miles and the lifetime fuel economy is 107 mpg. – Evan Sohm, Londonderry, NH