Interesting, but I would never dare to rely just on solar power for my festival needs.
Think about it: one rainy day, and you're bust!
I would still bring enough pre-charged batteries to keep me going for the whole festival, rather than risk running out of power.
But a solar panel would be a nice backup solution if all else fails, or if you want to give fellow tapers some extra charge...
![Smiley :)](/Smileys/throwback/smiley.gif)