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[Request for Recommendations] 1U-4U Uninterruptible Power Supplies (lemmy.inbutts.lol)

submitted 9 months ago by [email protected] to c/[email protected]

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I recently stated out loud that my homelab was stable, and now my UPS is posting less than 30 minutes of estimated normal load. What's everyone using as a UPS?

I've been rocking the aptly-named CyberPower OR1500LCDRT2U for the past few years. Should I just replace the cells or upgrade the whole unit?

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[–] [email protected] 3 points 9 months ago* (last edited 9 months ago) (1 children)

Well, if that is really a concern, you can keep the old UPS with not so good batteries still connected to cover that 20 microseconds difference.

But it is unlikely to matter in a homelab.

[–] litchralee 3 points 9 months ago* (last edited 9 months ago)

Did y'all mean to say milliseconds, and not microseconds? Sub-millisecond power loss would be less time than one AC cycle, whether 50 or 60 Hz.

Anyway, I do recall seeing some enterprise gear specifying operation through a drop in AC power lasting two cycles, precisely to cover the switch to UPS power, at least for 60 Hz power. So up to 33 milliseconds. A cursory search for hybrid inverters online shows a GroWatt with "<20ms" switchover, so this may be fine for servers and switches, when the inverter is operated without any solar panels.

For consumer grade equipment, all bets are off; some cheaper switch-mode power supplies do very weird things under transient conditions.