I'm curious if you have measured power at the well (e.g. smart plug with energy metering or Kill-a-watt.) I just set up a test server with a J1900 (10W TDP.) With 8GB RAM and running from an SSD it uses 25W. Add 4 7200RPM HDDs and it's up to 65W idling.
I have another test server based on a Raspberry Pi 4B. The Pi boots from SD card and uses about 5W. Add 2 drives in a USB drive bay and power for the setup is now up to 25W.
I have another test server based on a Raspberry Pi 4B. The Pi boots from SD card and uses about 5W. Add 2 drives in a USB drive bay and power for the setup is now up to 25W.