The Goal 0 solar set-up has worked great for me on short tours in sunny Florida and I can also plug the (4) AA/AAA battery pack into an outlet if one is available. It actually charges faster from the sun than the wall! Super durable and also can charge while not moving. Another plus is the crossover to non-bicycle traveling power needs. My only beef is the 4 battery slots are not individual charge circuits, but rather only two that treat a pairs as one.

Perhaps there was a hub or another issue, but on my Pacific Coast Tour I found the hub unable to charge at slow speeds common on large hills and was disappointed.