[bisby]

Power outages here tend to last an hour or more. A UPS doesn't last forever, and depending on how much home compute you have, might not last long enough for anything more than a brief outage. A UPS doesn't magically solve things. Maybe you need a home generator to handle extended outages...

How bottomless of a pit it becomes depends on a lot of things. It CAN become a bottomless pit if you need perfect uptime.

I host a lot of stuff, but nextcloud to me is photo sync, not business. I can wait til I'm home to turn the server back on. It's not a bottomless pit for me, but I don't really care if it has downtime.

[jmb99]

Fairly frequently, 6kVA UPSs come up for sale locally to me, for dirt cheap (<$400). Yes, they're used, and yes, they'll need ~$500 worth of batteries immediately, but they will run a "normal" homelab for multiple hours. Mine will keep my 2.5kW rack running for at least 15 minutes - if your load is more like 250W (much more "normal" imo) that'll translate to around 2 hours of runtime.

Is it perfect? No, but it's more than enough to cover most brief outages, and also more than enough to allow you to shut down everything you're running gracefully, after you used it for a couple hours.

Major caveat, you'll need a 240V supply, and these guys are 6U, so not exactly tiny. If you're willing to spend a bit more money though, a smaller UPS with external battery packs is the easy plug-and-play option.

> How bottomless of a pit it becomes depends on a lot of things. It CAN become a bottomless pit if you need perfect uptime.

At the end of the day, it's very hard to argue you need perfect uptime in an extended outage (and I say this as someone with a 10kW generator and said 6kVA UPS). I need power to run my sump pumps, but that's about it - if power's been out for 12-18 hours, you better believe I'm shutting down the rack, because it's costing me a crap ton of money to keep running on fossil fuels. And in the two instances of extended power outages I've dealt with, I haven't missed it - believe it or not, there's usually more important things to worry about than your Nextcloud uptime when your power's been out for 48 hours. Like "huh, that ice-covered tree limb is really starting to get close to my roof."

[Aurornis]

This is a great example of how the homelab bottomless pit becomes normalized.

Rewiring the house for 240V supply and spending $400+500 to refurbish a second-hand UPS to keep the 2500W rack running for 15 minutes?

And then there's the electricity costs of running a 2.5kW load, and then cooling costs associated with getting that much heat out of the house constantly. That's like a space heater and a half running constantly.

[bisby]

I agree with you. My use case doesn't call for perfect uptime. Sounds like yours doesn't either (though you've got a pretty deep pit yourself, if 240v and generator weren't part of the sump plans and the rack just got to ride along (that's how it worked for me)).

But that doesn't mean its for us to say that someone else's use case is wrong. Some people self host a nextcloud instance and offer access to it to friends and family. What if someone else is hosting something important on there and my power is out? My concerns are elsewhere, but there's might not be.

My point was simply that different people have different use cases and different needs, and it definitely can become a bottomless pit if you let it.

For me, IPMI, PiKVM, TinyPilot, any sort of remote management interface that can power on/off a device and be auto powered on when power is available, so you can reasonably always access it, and having THAT on the UPS means that you can power down the compute remotely, and also power back up remotely. Means you never have to send someone to reboot your rack while youre out of town, you dont shred your UPS battery in minutes by having the server auto boot when power is available. Eliminates reliance on other people while youre not home :tada:

But again, not quite a bottomless pit, but there are constant layers of complexity if you want to get it right.