# Transformer and watt or VA relation?

• neduet
In summary, the question is asking if a 15kva transformer can handle 10 split air conditioners, each with a power factor of 1.5, which would equal 15kw. Theoretically, the transformer can handle this load. However, if 5 more air conditioners were added, the total power factor would be less than 1, meaning the transformer may not be able to handle the load. This is due to the difference between kva and kw caused by power factor.

#### neduet

Hi friends
it is not ( problem or numerical) just i want know

friends if i have 15kva transformer .
then can i say it can carry 1500 watt 10 (split AIR conditioners) as a load.
and what happened if i add 5 more (split AIR conditioners) in same case. just give me idea please.theoretically

15kva transformer is step-down give 220 volt r.m.s output and
AIR conditioners (a.c)(with common power factor) also can operate on 220 volt or 1500 watt each.

No! Because:

Str should be greater than Pl/PF

However:
Str = 15 KVA
Pl = 10 X 1.5 = 15 KW
PF <1

-----------------------------------------------------------------
Creative thinking is enjoyable, Then think about your surrounding things and other thought products. http://electrical-riddles.com

m.s.j said:
No! Because:

Str should be greater than Pl/PF

However:
Str = 15 KVA
Pl = 10 X 1.5 = 15 KW
PF <1

-----------------------------------------------------------------
Creative thinking is enjoyable, Then think about your surrounding things and other thought products. http://electrical-riddles.com

Sir please explain more for me. if you can...
i can't understand this.

thanks a lot

sorry! I can not.

I would say you can because the odds of all 10 being on at the same time are low. That's called "diversity".

M.S.J.'s point, though, was that the difference between kva and kw is power factor. Because of power factor, a reactive load draws a higher kva than kw.