I have thought about this quite a bit. I have even looked into it a bit online, however being in downtown Portland doesn't always allot me much on the solar side, i see much more shade than sun some days.
I know harbor freight has a relatively cheap setup but the panels are pretty big and the technology is pretty dated- you don't get much charge from how big the panels are.
The Solar co. here in portland on Presumpscot st, is not far from my storage space and i was thinking of going in and consulting my options with them. If i hear anything worthwhile i will get back to ya.