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aruna
Active Contributor

Join Date: Jan 2009
Posts: 12

Determining UPS Power Consumption

01/14/2009 6:35 AM

I am looking to instal a UPS of 60 KVA. I want to know what will be power consumed by UPS itself while delivering at 50% load.

I was told that a 10 wh load will actually consume about 15 wh (1.5 times power) if powered through UPS.

Kindly help me
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Pathfinder Tags: ups
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bmcneill
Member

Join Date: Sep 2008
Posts: 7
#1

Re: UPS power consumption

01/14/2009 6:58 AM

Different UPS manufacturers have different consumption percentages. I recommend researching the more popular manufactures to get an idea of what is best suited for your application

Here's a list of popular makers:

Powerware - by Eaton

MGE - by Schnieder Electric

APC - also by Schnieder Electric

Liebert - by Emerson

GE digital energy

Chloride Power

I have a powerware 9390 that uses anything from 3KW to 7KW depending on the condition of the batteries
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ashoktoshniwal
Power-User

Join Date: Aug 2006
Posts: 183
Good Answers: 2
#2

Re: Determining UPS Power Consumption

01/15/2009 5:20 AM

Dear Aruna

Check the UPS efficiency at 50% load, from the UPS manufacturer. Accordingly you can find out the input power. Input power = output power/efficiency

Thanks and regards

Ashok Toshniwal, Bangalore, India
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Apps Man
Power-User

Join Date: Dec 2007
Location: Chicago, IL, USSA
Posts: 141
Good Answers: 3
#3

Re: Determining UPS Power Consumption

01/15/2009 4:34 PM

Hi Aruna,

In that size of ups they are usually about 83-87% efficent and if it has a Harmonic input filter than efficency should exceed 90% at full load. The efficency drops off at lower loads but should be about 70-75%. I believe your 1.5x number is high a more realistic number would be about 1.3x.
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DRFREON
Power-User

Join Date: Nov 2008
Posts: 158
Good Answers: 1
#4

Re: Determining UPS Power Consumption

01/15/2009 6:06 PM

I agree exactly with bmcneill. Also, you may want to consult PowerVar, Exide & Oneac.
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