Please help with buying a UPS for my system

Please help with buying a UPS for my system

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Please help with buying a UPS for my system amanda 10-14-2005
Posted by amanda on October 14, 2005, 2:01 pm
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I understand that I have to add up the power need of all the
components. How do I go about it?

I can find the voltage need for the (1)monitor (Dell's 19 in LCD ),
(2)keyboard, and (3)mouse, but do I have to open the case and check
individual components or can I figure out if I have the info from
packing slip? How to? Also, I want to add another 256 MB of memory
down the road.

Here is my system's components - from packing slip):

Dell Dimension 8100 Series, Pentium 4, Processor 1.3GHz
256MB RDRAM
32MB NVIDIA GeForce2 MX 4X AGO Graphics card with TV-Out
40GB Ultra ATA Hard drive (7200RPM ) + another one I added (80MB)
3.5 In Floppy Drive
Integrated 3Com Etherlink, 10/100 PCI Ethernet Controller
48X Max variable CD-Rom Drive, Factory Install
SB Live! Digital Sound Card with 1024 voices
Altec Lansing ACS-340 Speakerswith Subwoofer
8x/4x/32x/ CD-RW Drive, 2nd bay


Should I get the list from Device Managers instead?

Thanks.


PS. This was long overdue; I had 2 unexpected deaths of nephew and
niece - under age 25 - in my family (one in last year summer and then
one in last year fall and messed up my plan of doing that last summer.
I shouldn't wait any longer as this area (of past2 years) has more
black out than everywhere I have ever lived.



Posted by Todd H. on October 14, 2005, 6:27 pm
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> I understand that I have to add up the power need of all the
> components. How do I go about it?

Go to apc.com they have a calculator that will suggest products to
fit your needs.

APC UPS Selector:
http://apc.com/tools/ups_selector/?lid=UPS%20Selector

I have a Back Ups Pro 650 on a similar system, which may be more than
I need.


--
Todd H.
http://www.toddh.net/


Posted by amanda on October 14, 2005, 9:06 pm
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Thanks everyone.



Posted by Unruh on October 14, 2005, 9:21 pm
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>I understand that I have to add up the power need of all the
>components. How do I go about it?

>I can find the voltage need for the (1)monitor (Dell's 19 in LCD ),
>(2)keyboard, and (3)mouse, but do I have to open the case and check
>individual components or can I figure out if I have the info from
>packing slip? How to? Also, I want to add another 256 MB of memory
>down the road.

As a rule of thumb, just use the power that the power supply is designed
for. ESpecially modern LCD monitors, the power drain is smalll.
For your computer, it should be on a label on the back of the computer. By
law, the max power drain of an article MUST be placed on a label visible to
the consumer.

Your memory is irrelevant. If your memory taxes your power supply you will
have worse problems than your UPS.



>Here is my system's components - from packing slip):

>Dell Dimension 8100 Series, Pentium 4, Processor 1.3GHz
>256MB RDRAM
>32MB NVIDIA GeForce2 MX 4X AGO Graphics card with TV-Out
>40GB Ultra ATA Hard drive (7200RPM ) + another one I added (80MB)
>3.5 In Floppy Drive
>Integrated 3Com Etherlink, 10/100 PCI Ethernet Controller
>48X Max variable CD-Rom Drive, Factory Install
>SB Live! Digital Sound Card with 1024 voices
>Altec Lansing ACS-340 Speakerswith Subwoofer
>8x/4x/32x/ CD-RW Drive, 2nd bay

Irrelevant. the power of your power supply is all you need.



>Should I get the list from Device Managers instead?

No. Just look at the label on the back of the computer.

(If it is not there, then look for the power supply rating -- 200Watts,
500Watts,....)





Posted by Walter Roberson on October 14, 2005, 9:28 pm
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:I understand that I have to add up the power need of all the
:components. How do I go about it?

:I can find the voltage need for the (1)monitor (Dell's 19 in LCD ),
:(2)keyboard, and (3)mouse, but do I have to open the case and check
:individual components or can I figure out if I have the info from
:packing slip?

The keyboard and mouse are trivial. The monitor and the computer power
supply will both have stickers on them that indicate the voltage and
the amperage... for example, the device next to me indicates
that it accepts 100 VAC at 13A. The -maximum- power consumed by
the device is the product of the voltage and the amperage -- 1300 VA
in this particular case. The -maximum- is seldom hit (there is
usually a safety factor), and the maximum for any device is -usually-
at startup ("the inrush current")... though for a fan or other
electric motor, the maximum occurs when motor is being accelerated
[the timing of which depends on the motor design.]

UPS's are rated either in VA (Volt-Amps), or in W (Watts). The
conversion between VA and W is not entirely straight forward.
For standard equipment there is a factor of .707 (square root of 2)
in there, but computer equipment approaches closer to .9 or 1.


You -could- go through and do some messier calculations based upon
the individual components and the power supply efficiency specification,
but it is a lot easier to size for as near the maximum as you can
afford.

A typical off-the-shelf consumer UPS should be able to handle a
typical home computer and LCD monitor, but the more souped-up the
computer, the more likely that you'd need a more expensive UPS.


There is a a lot more to know about UPS's than just the power rating,
though. Different UPSes convert power in different ways and there
can be major differences in the kind of power problems that they
protect you against.

You might want to go through the UPS Selector on the websites
of Powerware or APC.
--
Many food scientists have reported chocolate to be the single most
craved food. -- Northwestern University, 2001


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