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How can I determine the necessary power of a generator set ?

How can I determine the necessary power of a generator set ?

 We propose a simple, practical way to determine the necessary power of a generator in five steps: 

1).Make a list of all the appliances (charges) and machines which will be connected to the generating set. 


2).Note down for every machine the power in Watt, the kind of charge (resistive / inductive) and the Power factor or cos phi. 


3).When cos phi = 1, then: 1 VA = 1 W.
When cos phi < 1, then: VA = W / cos phi

For electric motors (rule of thumb): take the power of the electric motor in HP and multiply it by 2.This is how we calculate the number of kVA the generator needs for starting the electric motor. 


4).Add all the obtained power in VA. 


5).Use a safety margin of ?20% on the result of step 4.
The conversion of the HP’s of the electric motor into the kVA’s of the generator is a THUMB RULE which is correct in 90 % of the cases but NOT ALWAYS!
When using this procedure to determine the necessary power of the generating set, you have to be sure that the power stated by the manufacturer of the generator is the real power, not the "commercial" power 
EXAMPLE: your need a generator for a 500 Watt heater, 5 strip lights of 50 Watt and a compressor of 2 HP
 

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