You can replace PC + UPS system by a laptop with external monitor
and with (USB) keyboard and mouse. Then you will have up to three
hours of power protection:). You definitely need to select a
laptop with adequate CPU/GPU/NIC for your tasks. Current (Dec 2007)
Debian unstable works fine on laptops with Intel CPU/GPU/NICs.
Moshe.
Omer Zak wrote:
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)
--
Moshe Gorohovsky
A6 CC A7 E1 C2 BD 8C 1B 30 8E A4 C3 4C 09 88 47 Tk Open Systems Ltd.
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