[werk_ag]

If you look at the cell (on the right hand side of the picture) that Werk supplies with his kit of parts, it has at least 3 and probably 6 separate sections (diodes) in series. 

You are right. The solar panel I'm using is composed by 8 individual solar cells, arranged in a parallel of two series of four cells, thus its a 2V solar panel. Short circuit current is between 110 and 120mA (not all panels are equal, one more reason to have a way to allow some calibration).