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Renogy E.Flex 21 Review – Portable Solar USB Charger

I will be taking a good look at the Renogy E.flex 21 watt portable solar charger. Matching it with the Renogy 20000 mAh power bank. Pitting it against the Anker 21 watt portable solar panel. Looking at the good and not so good points. And flicking through other E.Flex products in the range.

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