Is PoE more efficient than plugging in adapters for each network device?
And at what scale does it start to matter?
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From my perspective; I’m going for a 3 node mesh router, plus 2 switches, and was considering if in 5 years time the electricity difference would be less than the extra upfront cost. The absolute max length of cable would probably be around 30m
I think the efficiency greatly depends on your switch efficiency and how many devices you are going to power vs the efficiency of your PoE injector or wall wart.
There is also a convenience factor of not needing to plug something in locally.
Also, security, someone can’t just unplug the power supply for your camera per se.