Questions about UPS+surge protector

[Terrence Enger]

At 09:59 2004-05-15 +0300, 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.
>
>As a simple rule of thumb, add the nameplate ratings of the monitor and
>computer (e.g. 500W PSU + 100W monitor = 600W) and get a UPS with similar
>nameplate rating (600VA). this is not entirely correct but it should be
>close enough for your purposes (the VAs are Ws corrected for the power
>factor, aka caos phi. VAs are also known as real power. 

Are you sure you have this the right way around?  I thought VA was the 
unit for reactive power,

>Some equipment
>has really high cos phi).
>
>Peter
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>

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