Higoo Wind Charge Charging Controller for AC12V 50W 100W 300W 400W 500W Wind Turbine Generator Convert AC current to DC current so the AC turbine can be connected to battery. When the battery is full charged,stop the turbine to protect the battery from over-charging. When the charging current/voltage is too high, stop the turbine to protect the battery. When we want to stop the turbine, Connnect the thin cable to the positive polar of the battery,the turbine will be stopped, disconnect it the turbine will be restarted. IP67 waterproof design.