That's what I was thinking too. My home server consumes like 15 W and is silent.
If you get a rack mounted server made for data centers and stick it in a closet so you can't hear it then yes, i guess this approach makes sense.
It’s very easy for even the small things to add up.
Works good IME, but you have to plug it into the wall first. Sometimes if you plug the appliance in, and then plug the KAW in, it will miscalibrate
https://www.brennenstuhl.co.uk/en-GB/products/travel-adapter...