For fun here are some very rough figures. ~ 1000 watts per square meter from the sun ~ 5 horsepower from the surface of a car ~ 10-20hp for a car t

For fun here are some very rough figures. ~ 1000 watts per square meter from the sun ~ 5 horsepower from the surface of a car ~ 10-20hp for a car to travel at highway speed I imagine that 1 horsepower is much more realistic from solar panels on a car, even in perfect weather at noon.