Detailed Product Description wind turbine generator 1.CE proved+7 patents 2.high efficiency+small size 3.NO MOQ+wholesale price 4.professional factory   wind turbine generator   Main technical parameter Rated power(W) 20000 Maximum output power(W) 28000 Charging voltage (V) DC 240 Blade quantity 3 Rotor blade material GRP Rotor blade diameter (ft.) 30  (9.0m) Start-up wind speed (mph) 7    (3.0m/s) Rated wind speed (mph) 26  (11.5m/s) Rated rotating rate (r/min) 180 Wind energy utilizing ratio (Cp) 0.40 Generator output Frequency conversion AC Rated charging current (A) 83.3 The maximum charging current (in a short time) (A) 120 Output AC frequency (Hz) 0~320 Generator efficiency >0.87 Free standing tower diameter (in.) ?41.3*?29.5 (?1050*?750mm)  (2 segment) Tower height (ft.) 52  (16m) The weight of generator(lb) 1093  (496kg) Suggested Battery (Ah) 800/1000