The Rutland 913 is ideal for larger yachts and power craft who wnat to get away from it all, it is portable and simple to install to an existing battery system. It accumulates more energy in real wind conditions than any other comparable wind generator available, maximising your investment with the convenience of fully charged batteries. The Rutland 913 Features: Quiet aerodynamic effeciency and style Low wind speed start-up, trickle charges at 5mph Long life, high quality materials and construction Low cost per watt generated Simple to intall & minimum maintenance High quality materials and construction Mount on 41mm internal dia tube with maximum external dia of 48mm Performance: Continuous output above 5mph Rated power 90W (7.5A) at 22mph Net Weight: 10.5kg Gross Weight: 13kg Delivers up to 250W (20A) Produces up to 50 watts at 15 knots, 80 watts at 20 knots. No radiated interference. Very quiet operation. Low wind speed start up. Turbine dia 910mm. HRS regulator or HRDX Controller recommended to prevent battery overcharge.