3 ms·
The value proposition for a UPS is not "run through a power outage" (most don't store enough energy for that purpose). The value proposition is both of these i
by pwg 4y ago
The value proposition for a UPS is not "run through a power outage" (most don't store enough energy for that purpose). The value proposition is both of these items below:
1) enough time to do a controlled shutdown instead of a hard power cut when a full power outage occurs;
2) the ability to ride through small 1-2 second power flickers that would otherwise result in a hard power cut for the computer.
- PaulHoule 4y agoIt's a pretty small market then. For case (2) there should be some super-capacitors in the power supply. For case (1) the answer is https://en.wikipedia.org/wiki/Crash-only_software https://en.wikipedia.org/wiki/Crash-only_software as attempting a "clean shutdown" is a mug's game. Something that is a 30 second recovery after an uncontrolled shutdown often ends up taking 70 seconds when you attempt an uncontrolled shutdown. Systems are going to hard crash anyway, you might as well make that case robust rather than introduce more complex failure paths.
- pwg 4y ago> For case (2) there should be some super-capacitors in the power supply. Agreed, but sadly, I am not aware of any PSU with super-capacitors installed so that it can ride out the 1-2 second flickers. So at the moment there is no built-in ability (besides exclusively using a laptop) to prevent the 1-2 second flickers from also causing a hard shutdown.