Best panel
For expedition camps where there is no lodge at all
BigBlue 28W Solar Charger
28 W folding panel, ~670 g
Genuinely charges a power bank in a Himalayan day of clear sun, which is a real advantage on a camping trek — on a teahouse trek it is 670 g replacing a service that costs a few dollars.
Real output in high-altitude sun, which is fierce
Charges the bank while it hangs off a pack
No dependence on lodge solar being working
Heavy, and useless in cloud
Needs to face the sun, so it wants a rest day, not a walking day
A teahouse trek does not need it
Not for you if: Any lodge-based trek. Lodges charge for power precisely because they already have panels.
Check price on Amazon