The Ferris Waterpower 200 is one of the most powerful, reliable power products on the market. On a blue water passage it can supply the entire electrical needs of a well-equipped cruising sailboat! The Ferris WP-200 operates silently and efficiently, converting boat motion through the water into electricity, easily producing up to 200 Amp-hours per day on a passage. This unit easily converts to a FERRIS WINDPOWER wind generator for extended stays in port. The Waterpower 200 water generators are pre-wired and ready to install. The Wind/Water Generator Monitor (shown below) is part of the Waterpower 200 system. It contains an ammeter that displays charging output current from the generator while underway.