I started down the road of building a home brew solar system for my Cuddelinks, but I couldn't really justify it because Cuddelink is selling solar panel kits with rechargeable batteries for $49.99. Making one myself would be pretty close to that, plus a giant case with a battery sitting on the ground at the base of my tree instead of the sleek panel-only system Cuddelink offers.
I'm also excited about the dual-power bank system they are releasing this summer as it will connect to their solar panel system for (hopefully) 9 months to a year of power. So far my solar panels have over a month on them and are hanging in there. I wanted to test them in the winter months to see how they will perform this coming season.