Annotated edit history of
UPS version 4, including all changes.
View license author blame.
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PerryLorier |
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[Acronym] for __U__ninterruptable __P__ower __S__upply. |
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AristotlePagaltzis |
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Roughly speaking, this is a big battery that will run your computer for a short time when the power goes out. It isn’t usually large enough to maintain power to the computer for an extended length of time (hours) (unless your money:IQ ratio is too high, or, like [zcat | BruceKingsbury], you've been given four perfectly OK 21-plate truck batteries, which he says should sustain 12 hours of standby power, even with the screen on). It is there to handle short power outages (<10 minutes) and then allow the machine to shut down cleanly. |
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PerryLorier |
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AristotlePagaltzis |
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There are two major types: |
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zcat(1) |
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AristotlePagaltzis |
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* Online [UPS] is constantly charging the battery from the mains and at the same time drawing power from the battery to run the computer(s). |
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* Offline [UPS] keeps a charged battery around to switch it inline when the power drops below a certain level. |
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Online [UPS] will therefore isolate your computer from any power spikes or brownouts, whereas offline [UPS] usually protects it against brownouts but hardly from spikes. |
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JohnMcPherson |
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See also [UPSNotes] |