I saw one of these work at the Annapolis Boat Show a few years ago. Given that it was an October afternoon in Maryland, the angle of the sun was not ideal (and

I saw one of these work at the Annapolis Boat Show a few years ago. Given that it was an October afternoon in Maryland, the angle of the sun was not ideal (and there were a lot of vendor tents in the way). It still made a hot hotdog in about 15 minutes. I'm sure it could do much better in the summer with a clear view of the sun.