William Mitchell wrote:
> Jean-David Beyer <jeandavid8@verizon.net> writes:
>
>> Now I do not know the power factor (phase shift) of my UPS, but whatever. It
>> claims it can power a 2200 volt-amp load or a 1600 watt load, whichever is
>> less. In other words, it can deal with a power factor of 16/22 (or 22/16,
>> whichever way it is defined, and I do not remember at the moment).
>>
>
> I think its the power factor of the computer which is at issue, not
> that of the UPS.
>
> Think of the UPS as being the utility company, and the computer as the
> user. If the computer has a power factor of 1 (ie, is a resistive
> load) then the wattage it uses is the same as the volt-amperes the UPS
> must be able to handle. If the computer has a power factor of .5 then
> the UPS must be able to supply twice the volt-amperes.
>
Well, that's true enough.

However, my power supply vendor claim the power supply's power factor is
0.95 (Enermax EG851AX-VH(W)FM) and efficiency exceeds 75% (just checked with
the manufacturer, but the spec also saids 70%). It employs "active power
factor correction" whatever that is.

http://www.enermaxusa.com/catalog/pr...products_id=68

There are some complaints about this unit on some web sites, with failure
either immediately (DOA) and two failing within two years. Mine has been in
use 24/7 since early March 2004 and no trouble so far. They claim 100,000
MTBF for the things which is possible if the fans hold up. But I am only one
data point.

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 15:25:01 up 13 days, 17:53, 3 users, load average: 4.10, 4.21, 4.23

John Hasler wrote:
> Jean-David Beyer writes:
>> Now I do not know the power factor (phase shift) of my UPS, but
>> whatever. It claims it can power a 2200 volt-amp load or a 1600 watt
>> load, whichever is less.
>
> Ah. That's different. I understood you to say that it _drew_
> 2200VA/1600watts.

I do not know how much the UPS draws, since I do not know its efficiency. If
it is honestly rated, I cat get 2200 VA or 1600 watts out of it (whichever
is less). While it is doing that, it must take a trifle to trickle-charge
the battery, and a few watts to run the cooling fan if it is on, and
whatever power the electronics inside (which cannot be much). Now if it is
trying to quickly charge the battery, it must take the however much it takes
to recharge the battery as well as run the computer system. I do not know
what the efficiency of the thing is, but it cannot be too bad. The internal
cooling fan is temperature-controlled and normally runs only after a power
failure or on extremely hot (>90F) days.

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 15:40:01 up 13 days, 18:08, 3 users, load average: 4.27, 4.21, 4.19

Matt Giwer <jull43@tampabay.REMover.rr.com> writes:
>
> A south facing wall anyplace gets a lot more than a "couple" hundred watts.
^^^^^^^^^^
> Walls have lots of square yards.
>

Not here in the Southern Hemisphere, it doesn't.
<grins, ducks and runs>



Jack
--
Once, they feared you. Then they matched you. Now they are laughing
at you. Soon they will ignore you. You have lost.

Jack Strangio wrote:
> Matt Giwer <jull43@tampabay.REMover.rr.com> writes:
>> A south facing wall anyplace gets a lot more than a "couple" hundred watts.
>
> ^^^^^^^^^^

>>Walls have lots of square yards.

> Not here in the Southern Hemisphere, it doesn't.
> <grins, ducks and runs>

That Aussies drink so much beer they walk on the ceiling is not something I can
explain.

--
If the gang rape and murder of an entire family had happened in Boulder,
Colorado it would have been prime time news in the US for ten years. But it
happened in Iraq by Americans.
-- The Iron Webmaster, 3706
nizkor http://www.giwersworld.org/nizkook/nizkook.phtml
Larry Shiff http://www.giwersworld.org/computers/newsagent.phtml a8

Jack Strangio wrote:
> Matt Giwer <jull43@tampabay.REMover.rr.com> writes:
>
>> A south facing wall anyplace gets a lot more than a "couple" hundred watts.
>
> ^^^^^^^^^^

>>Walls have lots of square yards.

> Not here in the Southern Hemisphere, it doesn't.
> <grins, ducks and runs>

Is it my fault Aussies build the south sides of their houses on the wrong side?

--
Muslims do not hate Americans. Muslims hate neocons. So does everyone. I
don't see a problem with that.
-- The Iron Webmaster, 3709
nizkor http://www.giwersworld.org/nizkook/nizkook.phtml
Mission Accomplished http://www.giwersworld.org/opinion/mission.phtml a12

On Mon, 06 Nov 2006 02:36:59 GMT, Matt Giwer wrote:
> Jack Strangio wrote:
>> Matt Giwer <jull43@tampabay.REMover.rr.com> writes:
>>
>>> A south facing wall anyplace gets a lot more than a "couple" hundred watts.
>>
>> ^^^^^^^^^^
>> Not here in the Southern Hemisphere, it doesn't.
>> <grins, ducks and runs>
>
> Is it my fault Aussies build the south sides of their houses on the wrong side?

There is a (possibly urban) legend about a housing project that was
being built in California where the bulder had imported solar collectors
from Australia to be installed on all the roof-tops. The sub-contractor
faithfully followed the instructions to install the collectors on the
"house's most northerly facing roof section."

Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
38.24N 104.55W | @ config.com | Jonesy | OS/2
*** Killfiling google posts: <http//jonz.net/ng.htm>