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Are there solar powered window blinds?
(sh.itjust.works)
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Could be a fun excuse to learn to solder.
No need to solder.
Someone mentioned battery blinds that charges by USB, lots of small panels provide charge by USB.
I'd say it's worth spending extra on a panel that won't try to charge a full battery just to be safe, but other than that with as little juice as it uses you can buy a very cheap, very small panel and just stick it in an upper corner.
Batteries are not something you should mess around with without experience. There is a very real chance of a fire and your insurance might not pay out if its caused by you.
It's doable but I would be very careful and triple check everything. The better solution is probably to plug it into an outlet or directly wired into the house, with the solar panels on the roof instead serving the entirety of your home.
Good point, it didnt sound like there was any accessible power source, but definitely an assumption on my part.
That's definitely a concern! Even worse than insurance would be the entire recriminations from my wife.