After sailing, isn't that what boats are for? I tell people what's in the bottle is inexpensive but the cold makes it expensive. Between the panels, the controller, and the little 12v Isotherm fridge we're talking a couple boat bucks.

However, when you compare solar power on a mooring vs. shore power at a dock, the overall cost on a mooring is much less and the setting is so much more private and pleasant. It's our escape, and we can change the view just by raising the sails.