OhMan's distorted waveform is a product of harmonic distortion. Readily apparent when genset is powerimg an inductive reactive load. This is why I chose Kato. Utility grade waveform. Delco H9000 volt reg droops three hundredths of volt 150 - 12,000 watts. Woodward electronic governor never have seen
Freq higher than 60.1 nor lower than 60.0
Contrator grade generator waveform can induce nausea. Distorted sinewaves and transformers do not like each other. Yotta see what an RV park full of rigs with cycling air conditioners does to service waveform. It'll give somone watching with a scope, diarrhea.