I bought an Ecoflow River Pro and a solar panel (160W) this year to power an electric cooler and run devices. It's not at all cheap, if your spot is overly shaded it can run out over a weekend, and there's a lot more management of it required than I anticipated. It's great to have and I love it, but it's pricey and involved to venture beyond standard battery banks.
If charging devices is all you need, I think buying a bunch of little banks and charging them pre-trip is probably the best bet. Charging them there via solar might be a bit of a hassle.
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