... direction the unit uses electrical automatic adjusttower hight20m(optional)turbine main body weight5000KgcertificateCE,ISO9001:2000generator efficiency:>0.78wind ... 20KW, 25KW, 30KW, 50KW, 60KW and etc. Above wind turbine ,using pitch,unloading, electronics yawing ,pneumatic yawing etc advanced ... ,pneumatic etc braking technology so that the wind turbine can work stably even faces storm or other ...