Re: back-up power supply
From: Walter Roberson (roberson_at_ibd.nrc-cnrc.gc.ca)
Date: 04/01/04
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Date: 1 Apr 2004 17:38:24 GMT
In article <ca3e516b.0404010846.75be1793@posting.google.com>,
curious <heyimjustcurious@yahoo.com> wrote:
:roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in message news:<c4ftq3$d7t$1@canopus.cc.umanitoba.ca>...
:> If you compare Powerware side by side with APC, you may end
:> The differences -are- there, they just take time to
:> dig out: they are in matters such as whether the UPS has a 12 year
:> MTBF or a 20 year MTBF (Mean time between failure), and whether the
:> [hot swappable] logic boards have dual control circuits in case of failure
:> or just single control circuits.
:> And if you happen to need true online
:> UPS's in the fractional-kilowatt playing field (from 700 watts up) then
:> powerware makes nearly the only ones I could find.
: So dual control circuits in case of failure or just single control
:circuits
: vs
: fractional-kilowatt playing field (from 700 watts up)?
Sorry, you missed a little bit of the implied context there. I was
talking about the high end APC units, and saying that they are designed
with multiple levels of redundancy, some levels of which you won't
find on the high end Powerware. Depending on a person's exact needs,
those extra levels could be crucial (e.g., E911 call centers) and
thus worth every penny -- or those extra levels might be just
"frosting on the cake" and not needed (e.g., places where it's not
important if once in 10 years you are down for a few hours while
a part is brought in.) If you are necessarily fanatical about your
power supply, then do deep research into the top ends of the
APC, Powerware, and Liebert lines (and possibly some others).
But at APC's consumer level equipment, it's like a whole different
manufacturer, and APC's mass market equipment should not be -assumed-
to be the best technical buy nor the best price. APC's mass market
has something like 70% of the market share -- but some of the other
companies really challenge APC in quality and price. But you might
not be able to find any "decent" equipment other than APC's at
Fry's or Best Buy. Most of what you find at Fry's or Best Buy is okay
for getting you over those little power failures that happen from time
to time in any residence, if "continuation of power" is what you
are looking for. If you need power protection more meaningful than
that, then I suggest you should go to some manufacturer's sites and
track down local distributors -- or do your selection carefully
online and do online ordering.
:I don't need it in terms of keeping equipment running for hours, but
:which situation would require to seriously think in terms of
:kilowatts of backups? Is it just to be specific? Then I would need to
:get info on Wattage usuage of each piece of equipment?
www.apcc.com and www.powerware.com both have "UPS Product Selectors"
to guide you in sizing a UPS.
I went through one of those a moment ago, and selected a Dell Optiplex
GX240 computer with a 17" CRT, 1 internal drive, a CD-ROM, DSL Modem,
powered speakers, and a tape drive. I asked for protection for
15 minutes, with a 20% power margin built in (in case new equipment
is added, the computer is upgraded, whatever.) The selector suggested
a 1250 watt (1.25 kilowatt!) UPS, which would give an estimated run time
of 22 minutes under those equipment conditions.
Computer equipment electricity needs add up faster than you expect. :(
-- How does Usenet function without a fixed point?
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