Questions about UPS+surge protector

[James Knott]

Peter L. Peres wrote:
> You do not say how many computers. Typically a 400VA UPS with 12V 7Ah
> battery will keep a Pentium machine and a 15" monitor going for up to 20
> minutes. Most power failures will be under 5 minutes. There is a
> classification for this, ask your electricity company.
> 
> All UPSs with serial connection will talk to Linux ups daemons, in
> so-called 'dumb' mode, using a simple serial cable: means you get power
> failure/power back signalling, and low battery indication. Smart implies
> you have real time display of voltage, battery status, amps, etc. I have
> not yet used a UPS with USB with a Linux machine.

I have two USB connected APC 500 VA UPS.  They work fine, complete with 
status messages and shut down.
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