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Participant

Join Date: Mar 2014
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Diesel Generator

07/30/2014 1:28 AM

Dear experts,

How much full load power can take from a 27kva DG.

Thanking you,

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#1

Re: DIESEL GENERATOR

07/30/2014 1:35 AM

~21 kW, depending on what the largest motor is that might need to be started after all others are already running.

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#2

Re: DIESEL GENERATOR

07/30/2014 2:23 AM

Exactly as much less as you have losses in the system and how much safety margin you want/need to apply.

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#3

Re: DIESEL GENERATOR

07/30/2014 6:08 AM

Doesn't the manual tell you?

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#4

Re: Diesel Generator

07/30/2014 10:31 AM

I despair, I really do.

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Active Contributor

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#7
In reply to #4

Re: Diesel Generator

07/31/2014 12:44 AM

Me too

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Guru

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#5

Re: Diesel Generator

07/31/2014 12:19 AM

What are the specs and I will see if I can find a manual for you.

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Associate

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#6

Re: Diesel Generator

07/31/2014 12:30 AM

With Most Generators normally you do not run more than 75% of the available load as it is hard on the system and that number is normally a number that is not intended for extended periods of time. Thus I would not go over 20 KW or KVA. If you want the thing to last. IF it is an el cheap but being that it is a diesel It almost for sure is a very good system and can easily do 20 continued and up to Max for a short time if it is Not too hot out or of there is a good breeze and it is cool out you can go a little higher. These percentages are average. Most gas powered you do not want to go over 2/3 or 67 %. But Diesel rigs tend to have better engines AND better Alternators. Or Generators if it is an older unit. If you do not know the load of something then get a clamp meter and make a 2 to 3 wire short extension using heavy separate wires for checking the load with the clamp meter. Change the Oil often and warm it up at low speed if it allows for that. Most of the diesel rigs do have a throttle to use for warm up at low idle then High idle then go to full load. If you have that option. Same with shut down. Remove the load and keep at high then low idle for a few Min each before shutting off. This will give a great deal more life to the engine and the Generator/Alternator. IF you do not have the manual you may be able to download it from the factory. Jim Davison

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#8

Re: Diesel Generator

07/31/2014 2:05 AM

Some one has well said it is 20 KVA conditionally ... which is motor you want to start last ... In order to gain maximum load you should start heaviest motor first and smallest at the last --- but your requirements should meet. Secondly someone correctly said normally maximum power regualarly can be drawn is in principle ( thumb rule) is 75 % i.e again 20-21 KVa. This is all for continous loading of generator. For smaller period it could be higher loads. I remember once drawing 1327 amps on a 1000 KVA DG with 1391 amps being max load - about 95.4% loading ... but only for 27 minutes later it tripped on high lube oil and high water temperature. It was a testing only not usual operations. Plan for 75 % in general.

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#9

Re: Diesel Generator

07/31/2014 10:45 AM

A 27KVA DG MUST deliver full power 21.6KW at .8 pf safely, if not you have been cheated.

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Guru
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#10

Re: Diesel Generator

07/31/2014 10:04 PM

Dear Mr.safaras,

If maintanance is proper, you can load 100%, since the design has some margin over and above the capacity. It s advisable to load around 85 % so that the best Efficiency will be achieVed.

DHAYANANDHAN.S

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#12
In reply to #10

Re: Diesel Generator

08/05/2014 2:30 AM

It is advisible not to make regular use of design capacity margines for regular use. Exigencir=es are exceptions. Don't load more than 75 % as a regular practice.

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#11

Re: Diesel Generator

08/05/2014 12:32 AM

It is 21 KW assuing your load PF is 0.8 lag.. otherwise you can use formula KW = KVA X PF..

Please let us know the Duty of this Alternator, is it rated as Peak Duty or Continuous Duty. Continuous Duty alternator can be loaded to 100 % of its Capacity (beware to maintain PF) for 24 x 7, where as Peak Duty Alternators can be loaded to 100 % for Specified Hrs.

During Design of Alternator the safety factor has already been taken into account, so you can safely load the Alternator to 100% load.

If this is Acoustic DG Set, kindly check the Inlet Air Temp to the Alternator and to the Engine as well. If the Inlet Air Temp Exceeds to specifications the deration will be applicable for the rating.

Regards,

Vishram LELE

It also depends upon the Capacity of your Diesel Engine (Prime Mover)

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Power-User

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#13

Re: Diesel Generator

08/11/2014 4:38 AM

27kVA x 0.8 (pf) x 0.75 (% )= 16.2 kW. This load can be connected and run as prime duty( continuous) .Use 27kVA x 0.8 x 0.85 = 18.36kW for Standby purpose. You will not get any 100% efficient generators or No manufacturer will recommend to run full load.

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