I ran calculations recently on solar panels on electric cars. Taking Tesla's numbers, I figure it about .3 kwh per mile. A car is 5 feet wide, there are about

I ran calculations recently on solar panels on electric cars. Taking Tesla's numbers, I figure it about .3 kwh per mile. A car is 5 feet wide, there are about 5 feet on the hood, 3 feet on the roof, and 2 feet on the trunk. So 50 sq feet, at 10 watts per sq foot, is 500 watts total. So 4 kwh per 8 hours, gives you 13 miles range. Or more likely, about 10 miles, once you count charging efficiencies.