Have you planned on getting a battery pack of some kind? 4 eneloops are nice, but that cell phone is really going to go through battery life if you start using it a lot.

Also a good question about the durability of it. Easy to clean the panels (ie, waterproof)?

My off the grid plan is to take my dinky lawn solar powered lights and use them to recharge my batteries. And if people aren't home, borrow their lights too shocked