Understanding Genset KVAR
Short answer: The power factor and kVAR's don't matter, because you're using a generator, not the national power grid.
Detailed: Your generator can supply a rated output of kVA, at any power factor. The rating reflects the amount of electrical current the armature windings in your generator can sustain. without burning the insulation.
If you were paying for electricity from a power utility company, they would charge you based on the amount of electrical current you took from them, because current makes their power lines hot also, that heat costs them money, and there is a limit to how much current the power lines can carry, just like there is in your generator. So if you're using the current, someone else can't, therefore, they  charge you for it.
VAR's (kVAR's) is the electrical power which (most commonly) magnetizes the field in an electric motor (energy storage), and is returned to the supply each half cycle. It is not consumed by the motor, just borrowed. So in the case of your generator, motors are borrowing and returning power twice every cycle. The diesel engine driving your generator only knows about the kW's, so you won't save money or fuel by correcting the power factor with an auto-switching capacitor bank (to handle the borrow/return) in this case, as you would if drawing power from the national grid.