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

Discussion in 'Electronic Design' started by [email protected], Oct 4, 2007.

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  1. Guest

    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?
     
  2. TT_Man

    TT_Man Guest

    2200 watts ish :)
     
  3. Gibbo

    Gibbo Guest

    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.
     
  4. 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.
     
  5. MidJet

    MidJet Guest


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

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  6. Nico Coesel

    Nico Coesel Guest

    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.
     
  7. Phil Allison

    Phil Allison Guest

    "Stanislaw Flathead

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

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




    ........ Phil
     
  8. Phil Allison

    Phil Allison Guest

    "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
     
  9. Nobody

    Nobody Guest

    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.
     
  10. David Jordan

    David Jordan Guest

    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.
     
  11. Guest

    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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