I spent a week off the grid, without access to either fresh running water or electricity. However, despite there being no power outlets, I managed to keep my iPad and iPhone charged up the whole time.
Want to know how I did it? No problem! I documented it over on Hardware 2.0.
I had some pretty cool gear, including a couple of Powermonkey Explorer packs, a Powermonkey Extreme pack, and a 7W Portapow solar panel.
Great fun both being off the grid, and being able to use my devices. Check out the full piece.