... 1.High transmissivity. 2.Tested by hailstone. 3.CE,ROSH,TUV. SpecificationsProduct model Solar panels One- ... silicon 10 W18V, take 5 meter Built-in 3 A12V and free maintenance controller of lead-acid batteries ... AH12V 10 3 W12V, take 5 meter and the line switch, ... -20W Single/amorphous silicon 20W18V, take 5 meter 3 W12V, take 5 meter and the line switch, ...