I don't have equipment to measure the current in low lighting (it's slightly
less than 1mA, by inference) but I still get the effect if i switch the
order of the two solar elements... it's always the one on top - providing
the positive voltage - that has 2v across, and the one on the bottom
having -0.5v.  They are set in a position where they receive approx. equal
lighting at the same angle (side by side on a desk under a lamp a few feet
up).

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of David VanHorn
>
>
> Are they equally illuminated?
> Try putting a load on the two panels separately, and checking them in
> place. If one is putting out more current than the other, then you would
> see as you describe.
>
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