... 3.Less vibration,Easy install ,Free maintenance 4.CE, ISO Wind generator Model:TECH20kwModelTECH20kwRotor Diameter (m)11Material of blades and No.RFP ... controllerRotation per minute for generator (rpm)120Material for generator coverStainless steelWorking wind speed (m/s)3-20Cut-in wind speed (m/s)3Rated ... (kg)800kgPack zie6 m3Suggestion battery12v 200ah 30 pcsWarrantyOne year 20kw wind generator