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I have a 2200VA UPS - How many watts can it support?

Hello, I can say that I always get a bit confused when dealing with VA
W and UPS. I have an idea how it works but just want confirmation:

The equipment that I have is gives me WATTS (354W, 360W, 90W, etc)
they are switches and servers:

I have a UPS that is 2200VA How do I know how much wattage to put on
it?
 
T

TT_Man

Jan 1, 1970
0
Hello, I can say that I always get a bit confused when dealing with VA
W and UPS. I have an idea how it works but just want confirmation:

The equipment that I have is gives me WATTS (354W, 360W, 90W, etc)
they are switches and servers:

I have a UPS that is 2200VA How do I know how much wattage to put on
it?
2200 watts ish :)
 
G

Gibbo

Jan 1, 1970
0
Hello, I can say that I always get a bit confused when dealing with VA
W and UPS. I have an idea how it works but just want confirmation:

The equipment that I have is gives me WATTS (354W, 360W, 90W, etc)
they are switches and servers:

I have a UPS that is 2200VA How do I know how much wattage to put on
it?

It depends on the power factor of the load.

Look it up. You might learn something.

The UPS has a maximum current it can supply. This ties in with a maximum
VA. When you look up VA versus Watts you will get it.
 
S

Stanislaw Flatto

Jan 1, 1970
0
Hello, I can say that I always get a bit confused when dealing with VA
W and UPS.
UPS is not in this club.
I have a UPS that is 2200VA How do I know how much wattage to put on
it?

2200 (VxA cos(phi) depending on the angle between voltage and current as
defined by your load. Go guess.

Have fun

Stanislaw.
 
M

MidJet

Jan 1, 1970
0
2200 watts ish :)


Not true, Around 1800 watts-+
18 light of 100 watts

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N

Nico Coesel

Jan 1, 1970
0
Hello, I can say that I always get a bit confused when dealing with VA
W and UPS. I have an idea how it works but just want confirmation:

The equipment that I have is gives me WATTS (354W, 360W, 90W, etc)
they are switches and servers:

I have a UPS that is 2200VA How do I know how much wattage to put on
it?

It depends on the cos(phi) factor of the load. UPS are mostly sold to
be used with computer equipment. IIRC computers have a typical
cos(phi) around 0.72 So that would be 2200 * 0.72=1584W.
 
P

Phil Allison

Jan 1, 1970
0
"Stanislaw Flathead
2200 (VxA cos(phi) depending on the angle between voltage and current as
defined by your load. Go guess.


** Oh no - NOT AGAIN !!!!!!!!!!

The Flathead Fool still does not know the basic definition of Power Factor.




........ Phil
 
P

Phil Allison

Jan 1, 1970
0
"Nico Coesel"
It depends on the cos(phi) factor of the load. UPS are mostly sold to
be used with computer equipment. IIRC computers have a typical
cos(phi) around 0.72 So that would be 2200 * 0.72=1584W.


** AC supply loads that use rectifiers and filter capacitors to produce a DC
supply normally have a poor power factor or PF . Without any correction
device or circuits, the PF can easily be a low as 0.4.

The current draw consists of brief (1 to 2 mS) pulses that coincide with
the AC supply voltage maxima.

Since no phase angle exists between current and voltage - no " phi " can be
assigned.

The BASIC definition of PF does not rely on phase angle:

PF = watts / VA

where

V = AC RMS volts & A = AC RMS amps

When the AC current draw is a stream of brief pulses, its RMS value is much
higher than the same average current draw in the form of a sine wave.



....... Phil
 
N

Nobody

Jan 1, 1970
0
Hello, I can say that I always get a bit confused when dealing with VA
W and UPS. I have an idea how it works but just want confirmation:

The equipment that I have is gives me WATTS (354W, 360W, 90W, etc)
they are switches and servers:

I have a UPS that is 2200VA How do I know how much wattage to put on
it?

You don't. You need to know the apparent power (VA) of the loads.

http://en.wikipedia.org/wiki/Power_factor

If you don't know the apparent power, you can either measure it, or
just keep adding more load to the UPS until it fails.
 
D

David Jordan

Jan 1, 1970
0
It depends on the cos(phi) factor of the load. UPS are mostly sold to
be used with computer equipment. IIRC computers have a typical
cos(phi) around 0.72 So that would be 2200 * 0.72=1584W.

Maybe they used to be that bad.

Mine has a power factor of 0.96, 154VA, 148W. It's not a 'special'
power supply either. Switching on the monitor drops it to 0.93.


Dave.
 
I could definitely say this is one of my weak points in Sys/Net Admin.
-- I hear you guys talk and is like chineese. I feel like one of those
little old ladies that is trying to understand when somebody tells
them how to email and burn CD's. LOL

Well I think somebody posted around 1800 Watts more less.
 
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