A wind turbine charge controller functions by diverting power from the batteries and guiding it into a "dump controller" (also referred to as a diversion load controller) when the battery voltage begins to get too high. Once the dump load is running, the battery voltage lowers and the controller turns the dump load off again. This back and forth will continue as long as necessary to protect the batteries from reaching unsustainable voltage amounts. A wind turbine generator converts the wind's kinetic energy by converting motive power (mechanical energy) into electrical power for use in an external circuit.