immibis 4 hours ago

And if it has a 12-volt input, there's a good chance that can work directly from a panel between about 9 and 15, possibly even up to 20 volts. Don't quote me on that - this isn't sound engineering advice, just an idea of something that might work. If it's a 5-volt input then it probably needs a pretty accurate 5 volts. Same for NUCs and so on (again don't quote me).

You can even use a (right-sized) lead-acid battery without a charge controller, as they're pretty resilient, unlike lithium-based batteries. This will both store power for night and stabilize the voltage. The lifetime would be a bit shorter. You can literally just parallel your solar panel, battery, and whatever you want to power, and it has a pretty good chance of working.