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?

 

2200 watts ish

 

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.

 

UPS is not in this club.

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

Have fun

Stanislaw.

 

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

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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.

 

"Stanislaw Flathead

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

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




........ Phil

 

"Nico Coesel"

** 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

 

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.

 

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.