Oh, you meant the brown dot is on the batbox! On your image, I have a generator and solor panel on top, and that same wire going to the top of my macerator. I took a screen shot, but can't find it in my computer, sorry.
No worries, but yeah, the brownish dot on the generator is the output face. Connect the wire to that, and then put the macerator on the end of that wire. From there, put the solar panel touching the battery box on any of the other faces, and it should work.