Thread: UPS capcity calculation.

Hi...
I want to know what capacity of UPS need for 10 PC's (all PC's have LCD's)?
How its calculated ?

I am going to use only one UPS and it will supply power to all PC's
I am confused abt watt.
How much watt UPS I will need ?
How its calculated ?

I want to know what capacity of UPS need for 10 PC's (all PC's have LCD's)?
How its calculated ?

I am going to use only one UPS and it will supply power to all PC's

You won't get exact values only by no. of PCs and monitor type. The components in each PC, power rating of LCD monitor etc. The better option will be call some company rep (like from APC) or a local electrical guy to get the correct idea of power consumption and backup.

I just want the general answer.
dont go with details.
I dont want to be fool by buying high end UPS.
Just want to know how UPS capacity is calculated.

Try this link

UPS Selector Sizing Applications

UPS selection depends on many factors. You won't get even a general value unless the components are more or less the same and their wattage is available.

Try this link if you are aware of the component info

http://www.apc.com/tools/ups_selector/index.cfm

Originally Posted by nilesh1foru

I just want the general answer.
dont go with details.
I dont want to be fool by buying high end UPS.

There is no general answer.

Even the same pc can vary quite a lot in its power consumption, depending on what it is doing.

10 machines, even doing simple work, is quite substantial. Skimp on this, and the result could be, at best, failure, and at worst ... smoke. You will need quite a high-end machine.

Best thing is to get reps from several companies. At least one of them might even sample your actual usage by metering.

But always work on the safe side: after calculating what is needed, some safety margin should be added.

Just want to know how UPS capacity is calculated.

First: what amount of power is drawn by the total equipment connected to it. If ten machines draw an average of 200w each, you must have a UPS rated to handle more than 2,000 watts. Otherwise it will overload and fail.
Second:How long a power cut do you need to survive, and how frequent are those power cuts? Minimum answer is long enough for work to be saved and the machines to be shut down properly.

Maximum answer, depends on you. I want my single PC to be powered for at least two hours, because that is our standard "scheduled" power cut. If a second cut occurs before the batteries have been fully charged, then I may not be covered for that.

As with power capacity, add a good margin to to time capacity to. If you run your UPS batteries flat a few times, they will soon die. I learnt that the hard (and expensive) way!

If ten machines draw an average of 200w each, you must have a UPS rated to handle more than 2,000 watts. Otherwise it will overload and fail.

After shutting down my PC last night, I realised I should have added...

Vitally important that your wall socket and cable to the distribution box also is capable of carrying this current, otherwise the smoke may not just be from the UPS, but may be from the house.

This is a task that really needs professional advice and planning as to the location of the UPS and its cabling, as well as its specification.

Please take care and be safe