solar PV system : 1,TUV ,CE, RoHS ,ISO900. 2,1 years quality warranty ... -12MOpen Circuit Voltage21.24VShort Circuit Current3.20AMaximum Power Voltage17.5VMaximum Power Current2.86Aquantity1PCSpeak power 18V/50WSolar Module Dimension808*535*30MMControllerRating Discharge ... C~+55°CHeight≤5500m(More than 2000m need reduce the power to use)Lead-acid batterySize(CM): Nominal capacity38AHApprox Weight ...