Comment by js2
6 days ago
The HP's power-supply is 19.5V:
https://www.ebay.com/itm/235241551377
The SD-500 is available in 12V, 24V, and 48V, none of which adjust to that range:
https://www.meanwell.com/Upload/PDF/SD-500/SD-500-SPEC.PDF
Also, not sure why you're suggesting a DC-DC supply here? His input is AC.
Probably the idea is to have one big AC-DC PSU and then separate DC-DC regulators for each box from that rail.