Technical support
Selection generators

CONSULT TO CHOOSE A GENERATOR SET
Before decide to equip standby power system for office, factory, project... Beside finance we also must calculate the rated power to choose a right gen-set, this is very important to avoid over load (not enought) or under load (waste).

To choose exactly gen-set, we must calculate many parameters such as KVA, I, K… So, here we advise to choose upon real power and experience.

Before choose gen-set, we must calculate every real power (KW) of load equipments, after that we convert to KVA upon power factor (cosφ) as follow:

Kind of Load

Power factor cos φ

Motor, Airconditioner, Freezer, chiller

0.8

computer, fluorescent lamp

0.4

Resistor or resistive lamp

1.0

KVA = KW/cosφ

Then, we sum KVA power of all load equipments 

Choose a new 100% generators set:

Choose gen-set with safety factor 1.15, mean that choose gen-set by taked load KVA and safety factor multiplication.

Example: Total Load Power: 150KVA

Choose a generator set: 150KVA x 1.15 = 172.5KVA

Choose a second-hand generators set:

Depend on every unit we have safety Factor from 1.15 – 1.3

Example: Total Load Power: 150KVA

Choose a generator set: 172.5KVA – 185KVA

NOTES:

When choose a gen-set we note some opinions as follow:

- Load power will increase in the future à need standby looad for this

- Started current high sich as Motor, compressor...

-  Load change up/down unusually.

-  Equipments generate reverse power such as Crane, elevator, big motors...

-  When choose gen-set we should base on continuos power because standby power can not over load running and in Viet Nam Power usual cut off hafl/whole day.

Contact cell phone 0903 760 787 for advise.

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0903.760.787