The panels obviously work best if they are facing the Sun directly, but the Sun is not always in the same direction, so a flat is a good compromise. You’ll also have to consider the shape of the car and its aerodynamics, because you need to make it as efficient as possible. So I would perhaps try to design the car to be as aerodynamic as possible and use a suitably shaped solar panel as the roof, if that is possible.
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22nebula21 commented on :
thanks for your advice 🙂