How many devices can I power?
AT first I thought would be a bogus question as the energy source might not be available (in the right position).  So I asked a friend

 to take a picture.



With that data I visited the NASA website and determined that your energy source was waxing gibbous.  The next full moon would have been Oct 28 so slightly off of peak.

http://eclipse.gsfc.nasa.gov/phase/phases1901.html



If you need a repeatable experiment I would suggest an alternative energy source.


I've never actually used this product, but I suspect that it is a cheap alibaba knock off .  I don't see how to get such a small device without the appropriate shielding and slow neutron absorption (for protection).  Please be careful.

I know I haven't answered your question "how many actuations" but I think it was poorly posed as your energy source is poorly choosen.  I think with my choice of energy source the answer becomes "as many as you'd like".  Up to the load limit of the reactor.  Am currently looking for a datasheet, will post back when I find it.