I just got back from doing the Mega European, which was amazing but it was all hostels so I can't comment on the charging arrangement. Even so I always carried a portable charger (like a rechargeable battery) on me which proved useful many times. I would suggest maybe considering some of the stuff Goal Zero make. I'm looking at getting a Nomad 7 (Maybe the second version) and either the 400lumem lantern or mini lantern. They are like $90 for the mini lantern, $130 for the bigger lantern and then they can be charged by the solar panel which I think is around $130AUD aswell. This is what I'm getting for hiking anyway, and the lantern acts as both a battery and a light.