I have just received one of these. The one cable for the connection is right for my Oak EB55 Powerstation, just plug it in. then we went out together in the sun and the display of the Oak showed charging. But it didn't go up to 74. it went up and down, oh no - 68- 58- up again times to 70. my Power Oak was in Eco mode. maybe that's why, it's an economy mode. maybe you should have the higher panel with 200 W, but I'll wait and see. maybe another brand. Connecting is child's play, what else can they explain, has no other function than the USB ports for smart phone etc.. small devices. Tia I am also still learning how to charge on the wall for the time being. best regards Erica