We have a 90 KVa UPS system. We draw only about 15 KVa power from the UPS to meet our needs. Our premises has a 250 KVA supply, what is the load of the UPS on the supply. Is it 90 KVa or 15 KVa?
2007-07-23 00:16:21 · 3 answers · asked by VM 1 in Computers & Internet ➔ Hardware ➔ Other - Hardware
Just follow the link.
2007-07-23 00:37:36 · answer #1 · answered by Low Contributor 6 · 1⤊ 1⤋
How did you make the assumption that you draw only 15KVa
power from the supply.
I infer that suppose you have installed say some 270 computers assuming 3computes per kva and you are
switching on only 45 computers then the load on the
power supply will be 15kva under certain conditions like
1. assuming an online ups the current needed to charge
the batteries.
2. the load factor is also dependent on the existing charge
on the batteries.
3. some ups have a rapid charger then the load will be
marginally higher.
but if generally the noload factor(no computers switched on
only the ups is switched on) is known then it will be
easier to calculate the loading factor.\
A crude method would be if you have a dedicated electricity
board meter then you can switch on the ups (no load)
observe the meter reading.
Then switch on computers gradually increasing the load
and observe the meter reading.
An easier method would be using a tong tester measure the
amps flowing through the power cable under different
load conditions and calculate watts. :-)
2007-07-23 09:31:07 · answer #2 · answered by chenzen 4 · 0⤊ 0⤋
90 at the most and only if it is completely flattened in use. 'cos the UPS will only draw what it needs
2007-07-23 07:40:52 · answer #3 · answered by Keith B 5 · 0⤊ 0⤋