Generator Sizing: Calculate & Consider Prime/Standby Ratings

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    Generator Sizing
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Generator sizing requires consideration of both apparent power (kVA) and true power (kW), with the generator itself sized according to kVA to prevent overheating. Diesel engines should be sized based on kW since they do not account for reactive power. The prime rating indicates the generator's continuous power output capacity, while the standby rating refers to its maximum output for emergency use. Proper calculations should factor in load testing results, including maximum apparent and true power measurements. Understanding these parameters is essential for effective generator sizing and performance.
Gopal
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Good day,

I have been working on load testing for generator sizing of various premises and I used a power and energy logger to do the load testing.

The results came out good, now that I got max apparent power in kVA and the max true power in kW.

My question is how should I calculate the generator sizing and what parameters should I consider in the calculation as I have never done this before, please let me know your thoughts on it.

Also what is the difference between the prime rating and standby rating for sizing the generator.
 
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Gopal said:
I got max apparent power in kVA and the max true power in kW.
My question is how should I calculate the generator sizing and what parameters should I consider in the calculation

The generator itself must be sized according to kVA. It is the absolute current in the generator that heats up the coils in the generator, and could harm the generator by doing so.

Say you have a diesel engine to produce the active power, it must be sized according to kW. The diesel engine cannot "sense" reactive power.

Gopal said:
Also what is the difference between the prime rating and standby rating for sizing the generator.

https://www.google.dk/search?q=prim...&oe=utf-8&gws_rd=cr&ei=d4pUVdCRIMfO7ga79oCQBw
 
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