I am planning for 16 racks data center with 10KW each rack (single phase load). So total load would be (10KW x 16) 160KW 1ph.
So based on my logic when I choose a UPS with *3ph output*, I can divide it by three. That means a UPS with 54KW 3ph should be sufficient. (plus buffer, I would think of SY96K96H-PD)
But I was told that I cannot divide load by three and must use UPS rated 160W 3ph or higher.
Can anyone advise what should be the correct method?
If you have 160kW load then you need a UPS rated for 160kW (around 200kVA) regardless of whether it is single or three phase.
The difference is that with a 160kW single phase system you would have a total current of around 840Amps on 1 phase. Whilst with a three phase arrangement the current would be 280Amps per phase.
Note: the above is based on the voltage in my region which is 240V single phase and 415V three phase - if you're in the US you will need to calculate based on yoru local voltage.
Hope this helps.
A few things to note about your calculations..
1) Most three phase systems have a output PF of .9 or 1.0 so 160KW/177KW or 160KW/160KVA at PF 1.0
2) On a three phase UPS the current load on 160KW is about 222amps at 415v at PF 1.0 or 192amps at 480v PF 1.0
I do not believe APC makes a single phase UPS at 160KW so a three phase unit is really your only option.
SY200K250DR-PD This UPS is a 200KW expandable to 250KW and can work with many different voltage inputs. You would have 175KW of power modules with 1 extra power module in reserve to keep your system online in case of a failure. 200KW total if your do not require a reserve module. Or you can have 175kw of modules no reserve.
Thank you all for the valuable input.
To confirm, when APC say 10KVA 3 Phase UPS, does it means 10KVA in each phase or 10KVA in total (appox 3.3KVA per phase)?
Yes a 10kva 3 phase UPS is rated by its total capacity which is the sum of all 3 phases. So 10KVA 3 Phase UPS = ~3.3kva per phase.
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