[werk_ag]

So, the fun part will start now. Building the thing!
I'm not sure if the type of solar cells usually supplied with these type of devices are the best for your purposes, but of course, the best way to discover, is trying.
Just a hint: unless you are planning to put something over the solar panel of these garden lights, don't buy just one, because in less than a year the shiny surface of the solar panel will become almost opaque, and it will supply half the current.