I have 4 DL360s with 96GB RAM each to run a K8s cluster with a handful of containers
If someone is paying you to host those and covering your costs, go wild! However, as a hobby you may be spending $925/year or more for electricity to run those in the Midwest. $1,387 if you're living in Boston, $1,850 if you're living in California.
In one year you may have been able to buy more new power efficient hardware from just what you're spending on juice.
Curious how you calculated that? What system load is it based on? Idle? Max?
Very much an estimate because OP didn't mention what generation DL360 they had, how many CPUs, drives, etc. So I assumed 120W continuous 24/7/365 consumption which is pretty low. Assuming 22 cents per KWh for midwest, 33 cents/KWh for Boston and 44 cents/KWh for California.