They certainly can. However, solar panels are best used where sunlight is ample. Since a car goes through shady areas too, it’s efficiency isn’t much. It is way less compared to what power a car needs. Solar power plants have perpendicular sunlight for most amount of time and also reflectors (mirrors) are used to increase the amount of light that falls on those solar cells. Also, they’d be incredibly inefficient in polar regions. In equatorial regions, if they’re cheap, installing on rooftop of a car can be thought about if their weight is lesser or comparable than the metal on top of car. If their weight is more than that of normal metal, more petrol will be used which would be worse.
They certainly can. However, solar panels are best used where sunlight is ample. Since a car goes through shady areas too, it’s efficiency isn’t much. It is way less compared to what power a car needs. Solar power plants have perpendicular sunlight for most amount of time and also reflectors (mirrors) are used to increase the amount of light that falls on those solar cells. Also, they’d be incredibly inefficient in polar regions. In equatorial regions, if they’re cheap, installing on rooftop of a car can be thought about if their weight is lesser or comparable than the metal on top of car. If their weight is more than that of normal metal, more petrol will be used which would be worse.