Basically the whole telco industry runs off 48V, and has for a very long time. You'd have a rectifier box that would take the AC and output 48V, and then everything would run from that.

A lot of the satellite and wireless equipment I've worked on has inherited that and runs off 48 too.

240W USB-C uses 48V, so that should eventually become common for stuff like gaming laptops.

Pro audio - most condenser microphones (except electret) run off 48v provided via the mixer/audio interface through XLR cables

ebikes, phantom power in audio equipment...