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Active Contributor

Join Date: Oct 2011
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Rating of UPS

01/14/2012 1:20 AM

Hi

I want to design one games shop as like as Ameoba in Mantri mall, in that i m providing 16 Amps UPS power socket for each video game, so while calculating load I took load for each point approximately as 750watts, now I want to know is my assumsion in correct? and how to select UPS rating for that?

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Guru

Join Date: Mar 2007
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#1

Re: Rating of UPS

01/14/2012 9:06 AM

Amps x volts = watts ....The game has a voltage and wattage requirement, allow an excess amperage of perhaps 10%, round the amperage requirement to the next higher circuit design....Calculate amount of time needed for outtage, this would be specific to your area....Then call these guys and ask them...

http://www.apc.com/products/category.cfm?id=13

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Participant

Join Date: Jan 2012
Posts: 3
#2

Re: Rating of UPS

01/15/2012 1:07 AM

To start with I know nothing about the games you have mentioned, however, as an electrical engineer I can guide you, briefly and without any technicalities, with the following:

You have to decide if you want a back up UPS, this is a UPS that takes care of any fluctuation in the incoming power with a very short time of power supply in case of power failure.

Another type of UPS, acts as a stand by power supply, which supplies the necessary power under complete power cut for a certain time. So it is not enough to know the voltage and amperage, you should watch the Volt-Amper-Hours.

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Guru

Join Date: Jun 2010
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#3

Re: Rating of UPS

01/15/2012 2:14 AM

Ask the client to give power rating(kW/kVA) from nameplate or manufacturer.

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Power-User

Join Date: Apr 2010
Location: Dominican Republic
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#4

Re: Rating of UPS

01/15/2012 6:49 AM

I have designed and installed many UPS power distribution networks like what you are describing and have always found that the best way to get the actual consumption of each device is to measure it using a true RMS ammeter. In my case I use a FLUKE 189 with a current clamp. I built a short extension cord with the potential coming out of the 2x4 outlet box so it is conveniently placed for the clamp on probe. Plug your game into this extension with the clamp on the loop then plug the extension into an outlet and turn on the game. Then measure the voltage and multipy the 2 values for the watts (actually VA´s). Example suppose you have 20 games and each game takes 3Amps at 120Volts AC. This would come out to 20 x 3 x 120 = 7200VA´s For safety and future growth I would pick a 10KVA UPS for such a job.

If you take the plate ratings located on the equipment it can often be misleading. In one very large office an Engineer had added up dozens of computers, printers and other devices and came up with 65KVA for the UPS. They called me to get a second opinion and after measuring each piece of equipment I came up with 30KVA. They took my advice and the system worked perfectly.

For this reason I always do the load study and never depend on the plate ratings.

One other important thing is to make sure the client never tries to turn on everything at the same instant. In most of my installations the UPS can usually handle brief overloads for a second or so but trying to start everything at the same instant can go beyond the overload limits of the UPS. I suggest the use of a breaker panel so if the equipment is shut down after hours it can be started again the next day by gradually turning on each breaker with a pause in between.

My clients who have a well maintained emergency generator only require short battery run times so the standard 10 or 15 minute battery packs that come with most UPS´s are OK however I have other clients who share a generator in a large multi office building and they do not trust the generator. For these clients who need long run times like 8 hours or more I build a custom UPS made from a large battery charger, a huge battery bank and then an inverter like EXELTECH. Since the inverter runs all the time there is zero transfer time and the critical load only sees perfect sine wave power 100% of the time.

So in concluding, measure the video games one by one, add a safety margin and go with those numbers.

John

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Join Date: Jan 2012
Posts: 3
#5
In reply to #4

Re: Rating of UPS

01/15/2012 11:02 AM

I do agree totally with John and I would like to ask him what kind of batteries he is using for the long run time and actual cost as I am presently located overseas and facing a similar situation to what he mentioned, noting that the voltage we are handling is 230V/50Hz.

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Power-User

Join Date: Apr 2010
Location: Dominican Republic
Posts: 189
Good Answers: 6
#7
In reply to #5

Re: Rating of UPS

01/16/2012 5:19 AM

The current project I am working on will be operating at 24VDC so to meet the run time required by the client we will use 24 2Volt 600AH LIBERTY LS2-600 cells wired in 2 groups of 12 in series then each group of 12 in parallel for 24VDC at 1200AH. These cells with steel jackets and interconnecting copper plates will run around 490USD each. They are very expensive but my experience using LIBERTY over the years is that they are the best and outlast all competitors by double the years. They are sealed and require no maintenance so can go in any room in the home or business. The steel jackets eliminate bulging and are recommended for hot climates but I also like them for protection from heavy handed shippers around the world.

John

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Active Contributor

Join Date: Oct 2011
Posts: 20
#6
In reply to #4

Re: Rating of UPS

01/16/2012 12:14 AM

1)For the above question concern i want to know how to select number of batteries for particular ups.

2)How to select strabilizer if i have 20 numbers of video game of each 600watts and bowling area, in Bowling area 4 numbers of LED TV.

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JOHN H VAN ALLEN (2); mannsyed (1); mghandour (2); pnaban (1); SolarEagle (1)

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