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 won't. 400 Watt max power is reached at 28 MPH wind speed.