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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.
Be careful. Those things are addicting.
That's how I started: a little 5v, 6 watt panel I stuck in the window to charge my phone while I worked. Then I wanted to charge some other stuff, so I got a 15W panel. 15w panel was nice, but 100 watts was much better, so I bought two 100W fold-up panels like you've got.
Then I bought a big 1 KWh power station that could supply up to 2000 watts. I take it camping and charge it from the two 100W fold up panels.
But, sadly, the demon had its claws in me and refused to let go. "Why should I only use that solar power two or three times a year?" the voice said. So I bought 4x 200 watt panels so I could use the power station to power my homelab and refrigerator during the day.
Still, that wasn't enough to satiate my addition. Now I've got 4 KW on the roof, 32 KWh of house battery, and a 10 KW inverter that is currently powering our house.
Am I satiated now? Only time will tell.
I've been looking to get a so-called "Chinese diesel heater" to my shed to keep it warm over the coldest days in winter when electricity is very expensive and the two small radiators designed to only keep it above freezing can no longer keep up. However, those run off 12V DC and power supplies seem to be surprisingly hard to come by. Easiest solution would be a car battery and a trickle charger but I've thought about just setting up a tiny solar system instead because then I would have a kind of off-grid location to fall back to. My house doesn't have a fireplace either but the shed does (sauna). This would also allow me to charge all my tool batteries that require a standard outlet.
For heating, I've been wanting to try a solar collector. Not sure if you've come across Greenhill Forge on YouTube or anywhere that covers his projects, but he does all sorts of off-grid stuff.
https://www.youtube.com/watch?v=8cPuVZjnbi4
That's where he builds and tests several different styles of solar collectors for solar heating. The collectors are pretty inexpensive to build so that may be an option if you just want to (help) keep a shed warm.