Ive had one of these for a few years.
https://nz.banggood.com/BlitzWolf-20...r_warehouse=CN
It appears that one is no longer available, but there's other similar units around. I only paid about NZ$60 from memory. It works pretty well, if you combine with a USB power bank, you can leave the power bank charging in the sun during the day at camp, and then use the Power bank to charge your device's over night etc.
I have a little 2 bay 5v battery charger too, which will charge any battery technology, from sizes from AAA up to 18650's, which is pretty handy, it can be powered off the panel direct or the power bank.
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