On Feb 13, 2:59*pm, Martin Brown
wrote:
I happen to have a nominally 8W PV panel to hand. Today on a relatively
overcast afternoon 7/8 cloud it managed a no load terminal voltage of
20v and a much more disappointing short circuit current of under 10mA.
If you are *very* lucky it might deliver 3mA into a 12v load (40mW).

Thank you for some very useful info.
I assume polycrystalline, mono should do a bit better in overcast.