These wind turbines efficiently harness wind energy 24/7. AC output at the wind turbine body ensures you keep the most power possible over the long distances from generator to batteries. High-quality marine-grade coating and construction provide versatility on both land & sea environments. Maximum power is reached at 28 MPH wind speed. Includes MPPT (Maximum Power Point Tracking) controller that optimizes output voltage. Works with all rechargeable 12 volt batteries.