On Mon, 2007-12-03 at 19:31 +0200, Geoff Shang wrote:
> 1. I'm guessing that there are two issues when it comes to UPSs - power
> output and how long that power can be delivered before draining the
> bateries. How much power will I need and is there a target length of time
> I should aim for? Does one factor influence price more than the other?
Actually, UPSes are rated in terms of volt-amper rather than power (in
watts). This is because UPSes need to deliver also reactive power
(which happens when voltage and current are not in phase).
I would aim at 200 volt*amper per PC to be protected.
UPSes generally deliver only few minutes' power. At the time I looked
for an UPS which can power a FAX machine (much lower standby power
consumption than PCs) for hours - but in vain. To deliver more power,
you may need a generator powered by motor.
This time should be enough for orderly power-down of the computers.
> 3. What are typical prices for UPSs in Israel? I saw an ad for some
> products today but I don't know how well they compare to prices generally
> (no brands mentioned, which was interesting in itself).
When I was in the market for UPSes, they had 3-digit cost in US$.
> 4. The ad mentioned above also mentioned surge protection. Is this a
> typical UPS feature?
Depends. For full protection, you would need on-line type of UPSes (a
bit more expensive).
> That's probably enough questions for anyone who wants to answer. I've
> never laid hands on a UPS so am not sure what to expect when I get one, but
> I'm guessing that there's a UPS howto out there somewhere which should at
> least tell me what to expect on the LInux side of things.
There used to be an UPS HOWTO, written by Harvey Stein (remembered by
the Linux-IL oldtimers). But it was several years ago.
You can also expect an UPS to be heavy - it usually contains lead-acid
batteries.
--- Omer
(who has two UPSes, one powers his FAX machine, and the other - his
computers)
--
One does not make peace with enemies. One makes peace with former
enemies.
My own blog is at http://www.zak.co.il/tddpirate/
My opinions, as expressed in this E-mail message, are mine alone.
They do not represent the official policy of any organization with which
I may be affiliated in any way.
WARNING TO SPAMMERS: at http://www.zak.co.il/spamwarning.html
=================================================================
To unsubscribe, send mail to [EMAIL PROTECTED] with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail [EMAIL PROTECTED]
