I have an Aliexpress 20W copy that folds up. Took it on a roar fly in on west coast with a 20,000mA USB power pack and a USB battery charger. Could use my phone as ebook and charge it when I slept via the USB power pack. Charged GPS batteries and power pack by the panel. And left the panel setup on the side of tent on a sunny day, did 4 AAs and the USB pack no problem. Also recharged my Inreach at night by the USB pack.
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