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I'm only half kidding. I'm a bit of a prepper and I have lots of powerbanks and devices that charge from USB but besides idling my truck I really had no other way to charge any of them in case of a long-term power outage which seemed a bit of an oversight on my part.
Not like this solves the issue. 30 watts (under ideal conditions) isn't much but it's a start.
The one statement I replied to gave examples like refrigeration and HVAC that a 30w panel will not run. I made no commentary on what use can be made outside of flashlights.
That being said, as someone who runs 100w panels on my trailer parked on some land, 100w is not much other then topping off a deep cycle battery to then run lights and a propane furnace and fridge. Not that it is not useful at anything, just that those rollup ones are generally used to charge a power bank for phones, lights, and such. One of the better uses I have seen is hooking up one to a car to keep it topped up while sitting. But if you are going to use a panel you need a battery and at that point why not go with a non flexable 100w panel that is about the same size or smaller?
That's exactly the use case I bought it for. In the picture I'm charging a powerbank. I'm intending to play around with a small-scale solar setup on my shed at some point but for now this is the one cheap investment that enables me to keep critical small electronics running indefinitely.
Check out some auctions, estate sales and such for some deep cycle batteries, solar charge controllers and panels. I have fixed my set up a few times over the years on the super cheap that way. The whole system is not bad other then the batteries for cost.