urgent help needed in selection of generator

[vipin]

Hi friends
i have some difficult comments for my selection of generator for one of my client..
i ll give the details here
i have a main panel at 462kw to be fed with a generator
connected load = 462kw
diversified load = 371kw (made from detailed calculation of all the feeders)
spare required= 20 % of connected load =92.4kw
total anticipated load on genset = diversified load + spare =371+92.4= 463.4kw
here all the equipments are kitchen equipments and there is no heavy motors involved in the project.....we can take almost 85 to 90% pf.

i ve selected a 725kva prime generator, but my main contractor says it is insufficient as the genset can be selected based on 70% of its capacity due to ios regulations. can some body help me to justify this, coz we ve already purchased the 725kva x 2 nos for duty standby operation..... the standby rating of the same genset is 800kva .

 

[bob]

genset can be selected based on 70% of its capacity due to ios regulations

What is the ios regulation requiring 70%? I would think that the mfg could back you up on this question.

 

[jwjrw]

I always let the generator dealer size the genset. I supply them with the info and let them tell me what I need.

 

[Robert Hutcherson]

Have you attempted to get the Peak Kilowatt Demand from the utility company service planner or from the monthly utility bills as some utility companies show this value? I would look at the past 24 months. The KWD will give you a truer figure to base your genset sizing and the amount of spare capacity your generator has.

Good luck

 

[BJ Conner]

Ios??

Ios??

Hi friends
i have some difficult comments for my selection of generator for one of my client..
i ll give the details here
i have a main panel at 462kw to be fed with a generator
connected load = 462kw
diversified load = 371kw (made from detailed calculation of all the feeders)
spare required= 20 % of connected load =92.4kw
total anticipated load on genset = diversified load + spare =371+92.4= 463.4kw
here all the equipments are kitchen equipments and there is no heavy motors involved in the project.....we can take almost 85 to 90% pf.

i ve selected a 725kva prime generator, but my main contractor says it is insufficient as the genset can be selected based on 70% of its capacity due to ios regulations. can some body help me to justify this, coz we ve already purchased the 725kva x 2 nos for duty standby operation..... the standby rating of the same genset is 800kva .

.
Do you have a job specification?
Teh only IOS I know is a goverment reg BuREC I think.
I would say your generator is big enough. Is the generator for Emergency, standby and/or optional standby? I woudl ask the main contractor for chapter and verse of the IOS he's citing.

 

[Ragin Cajun]

Several comments.

Get with one of the Genset manufacturers and use their sizing program. Gererac has what I think is the best one.

You need to know the sequence of how loads will be turned on. If you plan on ":all at once", the genset size will be unnecessarily huge.

Is this a new building or one in service for a spell. Getting actual demand reading will really help, but you still need to know sequencing!

RC

 

[boboelectric]

Another school question? I would only bid this from job bid specs.