Now the reason we don't see solar cars is that solar power cannot produce enough power run a typical car. The most efficient photovoltaic cells are around 13 watts per square ft
or 140 watts per square meter. If you figure that a car with solar panel area of 2 meter x 3 meters or 6 meters square, this would have an output of 840 watts or about enough to power a 1 horse power motor. This would be just a very small fraction of what a car would need to run.
Now of course, this is when the sun is shining. Now solar power could be used to generate the power to charge a battery when a car is parked but this would be better accomplished by a solar panel that is not a part of the car.
The power output of a solar panel is not enough to motivate a car and as a partial power system would be very costly because of not only the solar panels but they would need to be molded to the contours of a car..
I see the ev but when we are looking at a solar powered car I don't think it will be practical.