I now travel with a 40-watt solar panel most places I go, very light. I can get up to 2 amp at 20 watt on sunny days
I built a small travel box that holds 2- 12 volt batteries ice-fishing type batteries. has 2 USB ports, 1- 12v cig lighter outlet.
set it and forget it during the day. Night run 12volt min fans, charge up cell phones, etc.