As part of my practice I make paintings and drawings with embedded LEDs controlled by an Arduino clone and LED driver. I showed 10 new pieces during an exhibit recently and had great feedback but there were a few of the inevitable comments about "the wire" (i.e. the wire to the wall wart transformer).
I'd love to lose "the wire" and power these through some combination of solar panel and rechargeable battery. I'm no electrical engineer but the bit of research I've done leads me to believe that this is no trivial technical task. Combine that with the fact that most installations of work like this in the home (office, restaurant, etc) would not be in an area getting full sun and that even if it were possible, hanging work in direct sun has a harmful effect on it. And then there is the additional cost, whatever that might be.
So...before I conclude that it is not viable (technically, economically) I thought I would ask for more informed opinions. Spec-wise, in these current versions, there are 64 LEDs (average 2.3-3.3v), an Arduino running at 5v and a Maxim7219 running at 5v. No realtime clock to sleep the piece.
Would it even be possible to charge solar cells/recharge a battery under typical indoor, non-direct sunlight lighting conditions?