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.
I got one of those Anker Solix boxes, and a couple hundred watts worth of solar panels. I kinda want it rather than a generator for power outages. I’ve tested it, on battery alone it’ll power my fridge for about ten hours, with the panels I have the practical limit is about 24. And I’m not at the limit of number of panels I can install.
But, it has an interesting thing about it: It has a Time of Use feature. So if you’ve got peak power billing, you can set it to run whatever’s attached to it on battery during peak time and recharge during off-peak or discount hours. So it may get attached to my fridge for that purpose, with or without solar.
See that is where I find they ca get more useful. When you have a non emergency use for them as well.
I haven’t had a powercut for more than 5 minutes in my entire life. Have wondered if power at my allotment shed is worth setting up but not super keen on spending many hundreds/thousands it would take for any garden power tools and a generator would probably be a better option.
Lower power things might not be so bad. Though I really hate how modern powertools use proprietary batteries and each brand uses a different one. A powertool battery charger could be a modest size solar/battery setup.