I am planning a trip for next spring. After researching this post and some YouTube videos I can see that using a wall outlet somewhere can be problematic. I have a Schmidt Son hub and my current light setup allows charging or lights. This appears to be good enough for the charging of a passthrough battery for the phone with frugal phone use. I have looked into Solar panels for charging and saw a video by Nomads
. They purchased a semi flexible solar panel that is not over marketed garbage. You see these kind of panels on the surfaces of boats. The solar cells themselves are actually made in the USA. The panels are assembled in europe. I am going to try one of these panels out. Items to charge will be my phone, camera batteries and a set of daylight visibility lights. In addition a book reader and camp headlight. If i have a problem I can charge the passthrough battery somewhere, but prefer to avoid doing this like the plague.