... brake 3. Maintenance free 4.Long life on-grid wind turbineTouch screen interface, GPRS remote control, Hydraulic brake, ... optimum TSR, run in high efficiency; over rated wind speed, wind rotor never goes to over speed and has ... stable control; 3-35m/s wind speed, wind turbine can run smoothly.3. Direct drive permanent ... treats, no corrosion in 15years. 10kw on-grid wind turbine system