Solar Boats

Has anyone seen or bought a personal solar panel powered fishing boat? There are some now that are capable of carrying up to 4 adults, at a trolling speed of 5 mph. Clean quiet and nice to the environment, I think it would be cool if these caught on. Batteries hold up to a 6-hour charge, so the boat can be used at night as well.

me n my mate have got a motor boat.
I can imagine the solar pannels costing a lot of money.