I have two 100W solar panels on my RV, they are about 57 x 21 inches. On a sunny day, I am happy to see 11A @ 14.5V or so, around 160W. I have two 110 amp-hour batteries, and I am able to keep enough charge to watch about 5 hours of satellite TV and run lights with a good day's charge.

Optimally, you can get 1000W per square meter of solar, that's with peak performance. Chevy Volt has 16 kWh of battery capacity. With 50% efficiency for 8 hours, that means you will need to charge at an average rate of 2kW, so you would need 4 square meters of panels. That's a lot. Also, you would need to store this solar produced energy during the day, and charge at night, I would think, so you would need a second battery array and associated electronics for charging, both from the solar to the storage batteries, and from the storage batteries to the car.

Solar is expensive, I spent almost $1k on my little 200W system, and I did the work myself. Most of the cost is in the cells, so a system that would charge even a 40-mile car like the Volt would cost several thousand dollars, and you would need the real estate for the panels. But, other than battery replacement, it should last virtually forever.

Nuclear power plants, man, that's what we need. Store the waste in Pittsburgh.

-Chuck, Vegetarian fanboy