Rated Output: 3KW Max Output: 4KW Generator: Permanent magnet generator Rated output voltage: 240V Startup wind speed: 2 m/s (5.6 mph) Cut-in wind speed: 3 m/s (6.7 mph) Rated wind speed: 10m/s (22.4mph) Security wind speed:25m/s Number of blade: 3 Material of blade: Glass fiber Blade Diameter: 4.5m Speed protection: Automatic Leaned Rated Rotating Speed: 400r/min Wind Energy Transforming Rate: 0.42Cp Pole Diameter: 273*6 steel tube Tower height: 9m Work temperature: -40degrees~~+60degrees Allocated battery: 12V200AH, 20pcs Controller : inverter , controller , charger True Sine Wave