low startup wind speed 3 8m s vawt

{"cid":"91224559","title":"20KW Vertical Axis Wind Turbine with Hybrid Solar System and Low Startup Wind Speed 3.8m\/s","imgUrl":"https:\/\/img.chinax.com\/nimg\/d0\/58\/8c6faaaece01d39ac2af530cb280-200x200-1.jpg","attrs":{"Price":"18000$","Brand Name":"BF","Model Number":"BF-C-20K","Minimum Order Quantity":"1","Delivery Time":"20DAYS","Certification":"CE","Place of Origin":"China","Payment Terms":"T\/T,L\/C","Supply Ability":"100UNITS PER MONTH","Packaging Details":"PLYWOOD CASE","Material":"Q235&FRP","Working tempreture":"-45-60\u2103","Rotor diameter (m)":"6","Height of blades":"6.6","Rated rotor speed (m\/s)":"100r\/min","Speed regulation method":"Electromagnetic control","Top weight (kg)":"1800kg","Start up wind speed(m)":"3.8m\/s","Survival wind speed(m)":"50","Rated wind speed(m\/s)":"13","Tower type":"133mm steel tube","Height of tower":"12M","Material of blades and numbers":"Glass fiber reinforce plastic\/5","Output voltage":"220V\/380V","Work Speed":"3.8-25m\/s","Wind energy utilized coefficient":"30%-40%"}}