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The NPower™ 400 Watt Wind Turbine efficiently harnesses wind energy 24/7. AC output at the wind turbine body ensures you keep the most possible power over long distances from generator to batteries. High-quality marine-grade coating and construction provides versatility in both land or sea environments. Begins to supply power at a low 5.6 MPH wind speed, so even if the wind dies down, your power wont. 400 Watt max power is reached at 28 MPH wind speed. Product Style: Land/marine, Speed (MPH): 6.7 mph start up, Blade Diameter (in.): 47 3/16, Blade Material: Fiberglass with powder coat, Material Type: Cast aluminum, Volts: 12, Watts: 400 at 28 MPH, Rotor Size (ft.): 3.93, Overspeed/Overcrank Shutdown: 110 MPH, Mount Type: Pole mount, Weather Resistant: Yes, Dimensions L x W x H (in.): 26 x 42 x 42, Assembly Required: Yes Maximum Power Point Tracking (MPPT) Smart Controller varies voltage current ratio for most efficient charging Includes power conversion to DC at battery bank for 12 Volt charging Mounts on any 1 1/2in. Schedule 40 steel pipe