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Solar roof could be usefull for some price reduction (if the roof it's not too expensive), and if the car it's not a standart design but a ultra lightweigh design.
For example, if somebody built a car like Aptera, but lighter (Aptera it's not so lightweight as many people imagine) and add solar roof, the roof would be more significative to the car (Apetra design/Moreli design) than in ordinary cars, since the weight would be 1/3 or less, and the aerodynamic would be incredible.
A lightweight and great aerodynamic car needs a fraction of the electric energy of a standart electric car, making the 1,2Kw of the solar roof much more relevant to the vehicle's energetic needs. So the battery pack required would be much smaller, much cheaper.
I think a Moreli design with solar roof would be great car. For heavier cars maybe in future, when solar cell efficience reach 45%.
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