Building ugly cars has become a corporate priority for Toyota, so this fits right in.
So why not add folding solar panels like they have on satellites to increase the surface area? And don’t forget the dashboard and seats. They get plenty hot, so that energy can be used too.
I see the back window is covered. Why not eliminate all the windows to get a few miles more range? In a few years, all cars will be self drivers, so windows won’t matter and even today many drivers drive as if they are blind anyway.