... 7.5 W + (1.25 W *4) = 12.5 Product descriptionSolar digital camera backpack, travel bag,laptop bag ... 7.5 W + (1.25 W *4) = 12.5 WSolar panels output voltage: 20 VNote:Optional accessories (laptop ... V charging requirements of digital products.9 V / 12 V 2 A, support zoom digital camera, DV, portable electric ... computer,laptop computers ECT.16/19/22/24 4 A, support online computer, laptop computers ECT. 16 V ...