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).
The panel itself is capable of pushing out a full 13 watts if you use the 12v cigarette lighter socket adapter on the 8.0mm output. That way you can easily draw an amp at 5volts from the panel.