1.High transmissivity. 2.Tested by hailstone. 3.CE,ROSH,TUV. SpecificationsProduct model Solar panels One-piece power ... -20W Single/amorphous silicon 20W18V, take 5 meter 3 W12V, take 5 meter and the line switch, 2 sets Standard ... -25W Single/amorphous silicon 25W18V, take 5 meter 3 W12V, take 5 meter and the line switch, 2 sets Standard ... cells, higher efficiency, weak deduction, lon Solar fan (CE)