Supply two types: Grid-tie and grid-off type. And A set 20kw wind turbine contains: Gnerator + Cntroller + Inverter (grid-tie or grid-off) + Tower + Bland + Dogvane + (Anemoscop) Product got CE,ISO, CCC Certificates Detail specification as followes: Numbers of blade (P): 3 Materials of blade: FRP complex resin Rotor Diameter (m): 12 Out-in (start) wind speed: 3 Out-out (outage) wind speed: 30 Rated wind speed (m / s): 12 Rated speed (rotate / minute): 160 Max. Wind speed (m / s): 50 Wind energy ratio (% ): 0.42 Generator: Permanent magnetic generator Generator rated power (W): 20000 Max. Output power (W): 25000 Output voltage (VDC): 240 Rated current (A): 71.4 Type of off-course: Wind direct-ion is decided by tail Type of limit speed: Standing limited by automatic Protect: Auto Furl Tower: Wire guy Altitude of tower (m): 18 Charging control: Automatic Weight (KG): 1200 Battery: 12V 200AH X80