I've been experimenting with various systems to keep my phone powered over extended trips. Since I use it as a GPS, iPod, compass (backup, of course!), book, and a phone(!), after a couple days with even conservative use, it needed charging.

This system works very well. I attached some tiny Nite Ize 'biners to the side loops so it attaches easily to my pack. Open it up, turn on the battery pack and it charges the battery pack as I walk! Once the battery on my phone gets low, I plug it into the battery pack and it charges it all the way up in an hour or so. It can't charge an iPhone 5 directly from the sun - it needs to charge the battery and then the battery charges the phone.

The system works great; I've just been trying some other means and this one was extra. Weighs 14.4 oz. Packs down to 9"x6.5" (about the size of a birthday card in plan.

Here's the manufacturer's page: http://www.goalzero.com/p/79/guide-10-plus-solar-kit

Retails for $130. Asking $75 shipped anywhere in the lower 48.

Thanks,
Critter