On a car the amount of surface space wouldn't create much solar power, max about 2kW, it would help but might not be worth the cost.
This boat is different tho, it has unlimited space and can run entirely on solar;
http://arch2o.com/wp-content/uploads/201...
Electric cars are becoming more common, and these charge from line power. An individual home can supplement their line power with solar, so in that sense, yes. The batteries in the vehicle store energy, so the car can still run when it's dark.
If you mean putting the panels right on the car itself, there isn't enough energy in sunlight to continually power a regular car, but I suppose solar could be used to put a small charge on the vehicle if it is left parked in the sun.
It's been going on for quite a while with extremely expensive limos. Solar assisted, mainly in the roof but, also have been added to the trunk lid and hood as well. They are very well crafted into the panel and tend to dictate the color of the vehicle. If you did see them, you didn't know it. The vehicle is never really off. And unfortunately, are not used to conserve anything.
wind, solar, and water are all viable alternatives to fossil fuels. but they can be more inconvenient. you can't run to the store after dark with a solar powered car.
no solar enegy internisty in a unit area is low