Comment by SideburnsOfDoom

> To make the math more complicated, you could theoretically have an unfoldable solar roof.

This is not completely theoretical, this guy did it on his Tesla:

https://www.dartsolar.com/

https://www.reddit.com/r/TeslaLounge/comments/194ajsm/my_tes...

I doubt that it will go mainstream, since you can only unfold it when the car is at rest. And it's permanently like having a loaded roof-rack for aerodynamics and weight. You'd always be asking - why not get put the panels on the roof of a house or other fixed structure? Easier and you can add even more of them.