Load factor of a generator set is used as one criterion for rating a genset. It is calculated by finding the product of various loads:
Load Factor = % of time x % of load
% of time = time at specific load / total operating time
% of load = specific load / rated load
Extended idling time and the time when the generator set is not operating does not enter into the calculation for load factor.
For example, assume a facility has a genset rated at 550 kW and runs it two hours a week. During those two hours, it runs at 400 kW for 1.5 hours. Find the load factor.
The formulas reveal the following
% of load = 400kW/ 550kW = 0.73
% of time = 90 min / 120 min = 0.75
Load Factor = 0.73 x 0.75 = 54.75%
From: Electric Power Applications, Engine & Generator Sizing (Caterpillar)
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