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with an average of
One of these, or similar, small, lightweight and work extremely well, paid it with a powerbank or two to collect juice whilst on the move or camped, then use the powerbanks to charge things, and run USB type lights etc from.
That panel is way too small. 7W cannot charge a modern smartphone/tablet by itself (those are usually 10W+) and will take forever just to charge up the battery pack. For the MSRP of $120 you can get a 28W panel and still have $50 left over for a good battery bank, type C or otherwise.
This is just stupid marketing, don't fall for it.
in the UK
But I use these
26000mAh power bank - has dual input so charges twice as fast as most other ones.