So I finally got my hands on a scope
and put it on our generator
output. We have a NextGen 5.5kw, which is a small high-rpm, 2-pole generator
using a Kubota engine
and Markon generator head
that is voltage regulated with a capacitor on the excitation winding.
I always knew the output of these generator heads was dirty, and now I know how much. The following graphs are:
1. Generator waveform with no loads
2. Waveform with 15A resistive load (waterheater)
3. Generator with 15A inductive load (air conditioner)
4. Generator with the 120A heavy transformer-based battery charger
that draws 15A
The battery charger
cleans up the waveform the best, which I don't understand because it should be an inductive load with a relatively poor power factor.
The manufacturer admits that these are dirty generator heads and tells me that these results are not abnormal.
Please note that everything on board works just fine with this power, although the power drawn is a bit more than on shorepower because of the lower peak voltage of the generator.