We are operating a generator (Stirling engine in particular) that outputs a certain active power in the range of 6.5-8.9 kW. The power output is adjusted with pressure variation. The electrical machine is rated at 400V and 15.5A nominal voltage and current. For calculating the power factor is it correct to assume that the power factor varies between 0.62 to 0.83????
I'm not sure whether changing the power output changes the current draw so as to lower the apparent power and maintain the same power factor at different loads, or the apparent power is defined as S=sqrt(3)VI with the nominal values?
One thing to mention, there is no information concerning the set power factor of the engine. The results I provided are the actual output of the engine.
Your help is appreciate in advance