Have you looked into the SolarBreeze NX? It's a solar powered pool surface skimmer. Works 23 hours a day using stored energy in the battery that's charged by the sun! I have one (actually I have two - one still in the box) and it works great!
ooooh, I have not heard of such an animal. Going to go look now....
I've read they work great but don't last very long before they die?!?