large outdoor billboard are easy installation without pollution, clean and high efficiency, high flexibility Basic Requirements (For Example): 60W/DC48V, xenon lamp 14 pcs, 4 hours running per dayClimate Conditions: annual average wind speed ≥ 5m/sCertification: ULTechnical ParametersItemSpecificationsQtyWind generator unit900W/DC48V3 setRotor Diameter2.1 mBlades3 pcsSolar Panel100W/DC12V4 ...