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kayems
Active Contributor

Join Date: Jun 2008
Posts: 24

Residential DG selection

08/06/2008 8:47 AM

what can be the rating in KVA for a DG which can take up a load of 2T split air conditioner and some 800W halogen/CFL lighting loads? All single phase 230V, 50 cycles and the power rating of the ac is 2.1KW.

I have 5KVA in mind but like to have some design experts comments on this.

Thanks in advance.

kayems, india
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nesubra
Guru

Join Date: Nov 2006
Posts: 729
Good Answers: 2
#1

Re: Residential DG selection

08/06/2008 11:21 AM

5kva is quite adeuate.

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Anonymous Poster
#2
In reply to #1

Re: Residential DG selection

08/07/2008 12:22 AM

it is good to run d.g on or around 80% of total load. Your selection of 5 kva is ok
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kayems
Active Contributor

Join Date: Jun 2008
Posts: 24
#5
In reply to #1

Re: Residential DG selection

08/07/2008 8:04 AM

with 80% derating it can take up the load but my concern is whether it can withstand the starting load of the a/c. If initially yes what about over a period of time? What kind of safety/derating factor I can assume?

Thanks again,

kayems
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alexyartey
Member

Join Date: Jul 2008
Location: Accra, Ghana
Posts: 5
#3

Re: Residential DG selection

08/07/2008 5:31 AM

What is DG in the first place. Is it Generator? Please be specific because some of these terms are not internationally known.
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kayems
Active Contributor

Join Date: Jun 2008
Posts: 24
#4
In reply to #3

Re: Residential DG selection

08/07/2008 6:11 AM

Sorry, I should have been clear on that. Its Diesel Generator.

Kayems
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stahir
Active Contributor

Join Date: Mar 2008
Posts: 15
Good Answers: 3
#6

Re: Residential DG selection

08/13/2008 9:48 AM

Hi,

Normally ac torque load is very high than the running load. First check the starting torque of the ac, then decide for the DG rating. It seems impossible to start 2.1 KW ac on 5 KW generator.

Regards
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SAK
Commentator
Engineering Fields - Power Engineering - Projects Engineer

Join Date: Aug 2008
Location: Tanzania- East Africa
Posts: 71
#7

Re: Residential DG selection

08/22/2008 7:37 AM

consider the Ac load initially this is a auto regulating load and the starting in rush is high in my opinion you should be considering for a 7.5kva DG to reduce the flickers and disturbances when the AC starts

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Users who posted comments:

alexyartey (1); Anonymous Poster (1); kayems (2); nesubra (1); SAK (1); stahir (1)

Previous in Forum: discovering torque values - - transducers   Next in Forum: drver transformer?
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