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Load Capacity and Generator Capacity

11/06/2008 8:31 AM

how do i design for a capacity of a Generator to be use in factory and bank

how can i calculate the load capacity for a factory or building and make it out in kva?

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Guru
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#1

Re: design capacity for A generator

11/06/2008 8:37 AM

Capacity of generator is not an independent parameter and is related with lot of others parameters.

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#2
In reply to #1

Re: design capacity for A generator

11/06/2008 8:58 AM

i mean the kva , say maybe 150kva or 250kva, i needed to know how to calculate the total load to desigh the kva or recommend for the generator capacity. how i am going to do this?

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#3
In reply to #2

Re: design capacity for A generator

11/06/2008 9:56 AM

I've added this material into the original post to help refine the question.

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#4

Re: Load Capacity and Generator Capacity

11/06/2008 6:52 PM

My Friend,

Emergency Power System Design is not just you can get from nowhere. But, since you are asking, then, this will guide you......

* Make electrical load schedules and factors of the panelboards, mcc, switchgears and other electrical loads.

* Then calculate all loads, some are in HP and Watts, these should be converted to VA or kVA.

* Identify which are the "essential and non-essential" loads, those essential load only should be counted as a "load capacity" of the generator sets (EPS).

* Add your future loads (expected, at least 3 years growth) usually 10%

* if your computation is 90kVA, then you purchase 100kVA

Okay?

Eren

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#5
In reply to #4

Re: Load Capacity and Generator Capacity

11/06/2008 8:19 PM

Hi all,

I would like to add one more item to Mr. erenduarte to be checked before desiding generator capacity.

- if maximum motor is 10kW, this is about 15kVA, generator capacity must be at least 10 times the maximum motor kVA. thus 150kVA generator to be selected.

Regards

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#6
In reply to #4

Re: Load Capacity and Generator Capacity

11/07/2008 4:47 AM

thank you rakesh semual,ereneduarte and Akihito shigero for your contributions, please after gettingthe load and arriving at 1000watts, how do i calculate the conversion to the kva, and is there any other parameter when getting the conversion?

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#7
In reply to #6

Re: Load Capacity and Generator Capacity

11/07/2008 6:24 AM

My friend,

Only qualified electrical engineer can do this generator capacity sizing.

Are you an electrical engineer? How come you do not know this electrical variable conversions?

"My friend... little knowledge is very.. very dangerous". Don't attemp to do electrical works, if you don't have any experience and qualifications to do electrical engineering works. You might damaged equipment and systems, or you may kill somebody through you negligence. Please... Amen

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#9
In reply to #7

Re: Load Capacity and Generator Capacity

11/10/2008 5:02 AM

Sir,

i thank you for your advise and meanful contributions.Yes i am an electrical engineer, who have been off the field for some years and trying to get back now.I Venture into

Electronics hardware installations which i have been for some years now working with an organisation. I am going back to power( electricaL) which is my original field and i am updating myself with professionals and experienced ones like you. i am very familiar with all your advise and contributions.so be assured you are not dealing with a novice in this line, so dont worry about damaging equipment or hurting some one, i have my first technical degree in Electrical /electronics engineering twelve years back ,i have been on the field of consultancy and installations before opting out for while, but i am going back, my qusetions may be too elemantary some time, pls note i am updating my self and learning too,, Once more thank you so much , more questions will be unfolding from me soon

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Guru
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#10
In reply to #6

Re: Load Capacity and Generator Capacity

07/07/2017 9:20 AM

There are many small portable petrol/gasoline-powered generators available off-the-shelf that can deliver <...1000watts...> onto a load. Suppliers are widespread, particularly in rural areas.

Example (usual disclaimer).

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Anonymous Poster
#8

Re: Load Capacity and Generator Capacity

11/08/2008 6:43 AM
My friend,

The Engineering calculations may little differ for DG selection in factory and Banks.

Generally factories have balanced motor load.

Banks have un balanced light , fans and AC load. and Electronic Servers and Computers.

DG Set consist of 2 Major equipments

Engine : that provides Energy - Torque loads - KW

Alternator : that delivers KVA demand.

So,

1. Calculate the total average running KW / and peak KW - KWH requirements

2. Calculate total average continuous demand KVA / and peak KVA demand.

Study the load cycle of the factory loads - As many motors of very high KW rating like compressors / chillers / fans etc... switches ON AND OFF during the process.

Based on all above criterias,

With our experience, we can state that If you select in general,

Engine size : 10-20% above the total average operating KW

Alternator size : 20 - 30% above total average demand

( with the precaution that peak demand in KW / KVA shall be met by those equipments ) you may be able to select the most efficient fuel saving system.

regards.

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Users who posted comments:

Akihito Shigeno (1); Anonymous Poster (1); Chris Leonard (1); dgoldwaters (3); ereneduarte (2); PWSlack (1); rakesh_semwal (1)

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