GoalZero Nomad 13
WIll it charge my iPhone 4, 4S, 5? iPad etc.
The issue I've found with these panels is that the built-in USB port is not very efficient, the most current I've managed to see from it is around 4.9v and 0.5 amps. This isn't even up to the spec of 5v at 1amp (5watts).
To say it's not very efficient is a difficult statement to quantify, but my logic is that using the supplied cigarette lighter socket adapter in the 8.0mm port and a charger like this one, I'm able to pull much closer to the panels rated output.
I've started to maintain a page on Solar Panels and Battery Packs here.