9
[Request for Recommendations] 1U-4U Uninterruptible Power Supplies
(lemmy.inbutts.lol)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 16 Dec 2023
9 points (100.0% liked)
homelab
6484 readers
1 users here now
founded 4 years ago
MODERATORS
The primary concern is switchover time. A purpose-built UPS can switch in about 10 microseconds. Those large "solar generator" battery packs switch in about 30 microseconds. That might be fast enough, but it's not guaranteed to be fast enough like a UPS is.
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.
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.