Electric-car drivers trading gas for solar power

This July 2014 photo provided by Samuel Avery shows a 2014 Chevy Volt plug in Hart County, Ky. Avery, who is a professional solar installer, built both the garage and panel installation. A growing number of electric-vehicle owners are powering their cars with solar energy from panels on their homes. AP

DETROIT— Owners of electric vehicles have already gone gas-free. Now, a growing number of drivers in the U.S. are powering their cars with sunlight.

Solar panels installed on the roof of a home or garage can easily generate enough electricity to power an electric or plug-in gas-electric hybrid vehicle. The panels aren’t cheap, and neither are the cars. A Ford Fusion Energi plug-in sedan, for example, is $7,200 more than an equivalent gas-powered Fusion even after a $4,007 federal tax credit.

But advocates say the investment pays off over time and is worth it for the thrill of fossil fuel-free driving.

This 2012 photo provided by Bill Webster shows the 10.1 kW, 40-panel array on his house that went online in June 2012 in Frederick, Md. Since then, it has yielded an average 1,100 kWh per month, enough to cover 100 percent of the electric demand of the owner’s house, which is Energy Star certified, and powers the family’s electric car. AP

“We think it was one of the best things in the world to do,” says Kevin Tofel, who bought a Chevrolet Volt in 2012 to soak up the excess power from his home solar-energy system. “We will never go back to an all-gas car.”

No one knows exactly how many electric cars are being powered by solar energy, but the number of electric and plug-in hybrid cars in the U.S. is growing. Last year, 97,563 were sold in the U.S., according to Ward’s AutoInfoBank, up 83 percent from the year before. Meanwhile, solar installations grew 21 percent in the second quarter of this year, and more than 500,000 homes and businesses now have them, according to the Solar Energy Industries Association.

Tofel, 45, a senior writer for the technology website Gigaom, installed 41 solar panels on the roof of his home in 2011. The solar array — the term for a group of panels — cost $51,865, but after state and federal tax credits, the total cost was $29,205.

In the first year, Tofel found that the panels provided 13.8 megawatt hours of electricity, but his family was using only 7.59 megawatt hours. So in 2012, Tofel traded in an Acura RDX for a Volt plug-in hybrid that could be charged using some of that excess solar energy. In a typical year, with 15,243 miles (24,530 kilometers) of driving, the Volt used 5.074 megawatt hours.

Tofel used to spend $250 per month on gas for the Acura; now, he spends just $50, for the times when the Volt isn’t near a charging station and he has to fill its backup gas engine. Charging the Volt overnight costs him $1.50, but the family makes that money back during the day when it sends solar power to the electric grid. He estimates that adding the car will cut his break-even point on the solar investment from 11.7 years to six years.

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