Most solar power banks I've tested were gimmicks - this one is the real deal

• The ToughTested ROC 16 is on sale now for $85.
• It's a rugged, 16,000 mAh power bank with three ports, wireless charging, and a solar panel that could come in handy in an emergency.
• The solar panel has natural limitations.

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During peak sunlight, the Earth can receive as much as 100 watts per square foot at the top of the atmosphere. However, factors like clouds and rain (which I have plenty of experience with living in the UK), and the angle of the sun over the horizon reduce this amount. 

Also: I tested a solid-state power bank that's seriously durable, but two things hold me back

And it's all free, just waiting to be harvested. So, it makes sense that we'd eventually start using it to power our homes and gadgets. Over ...