A long time ago I saw a thing about how foolish the creator thought it was people had stopped using awnings. They keep out the worst of the sun in summer and let it in during winter, when the sun is at a lower angle. My immediate next thought was, ‘why don’t we have solar panel awnings?’ They don’t require making holes in your roof you then have to worry about leaking. They can be mounted at the same angle as the roof so they wouldn’t be less efficient in many places. They could be added like eaves and keep the sun from heating the walls too, a huge benefit in hot areas.