There's a gap in the available tags. The only tags with “power” in the name are power and power-supply. If we believe their descriptions, then power is for RF power levels only (though it doesn't say that) and power-supply is for, well, power supplies.
The gap in this tagging scheme is that there is no tag for questions about DC power but not power supplies (e.g. 12V power distribution). We currently have 5 such questions, 4 of which are tagged power.
I think that it would make sense to create a tag for the topic of getting power to equipment — hence including not just AC-to-DC power supplies, but wiring, solar power, interference/grounding issues in power wiring, etc.
The first name that comes to mind for such a tag would be dc-power, which I think is pretty good, but I'd rather one that doesn't specifically exclude AC line power. (We could declare that power-supply includes these things, following the argument I once heard that a power supply is not just that conversion box (a power adapter) but also everything connected to the input side of it, but I think that's an argument that's been lost.)