When you're docked in a marina or similar its unlikely there would be space. When you're sailing or motoring somewhere you want the minimum drag\resistance thr

When you're docked in a marina or similar its unlikely there would be space. When you're sailing or motoring somewhere you want the minimum drag\resistance through the water, and more importantly, the waves would smash them to pieces in no time. To make them weatherproof would mean making them less like a floating solar panel and more like a small boat.