Sal, "clean power" can be expressed as a definitive number in total harmonic distortion. Few voltage regulators these days do not use PWM (digital) voltage regulation including primary excitation on multi megawatt power generators. It's the STATOR that determines the purity of sinusoidal waveform on an AC generator that is not part of an inverter system. For years I had as souvenirs 150 lb thyristors used as part of the DC megavolt transmission line running through Nevada.
Rejection due to "excessive" THD can be caused in two ways: One is the inverter is junk and rejects waveform more than say 4% distorted. The other is to have a generator (A Generac comes to mind) that loves to outgas electricity with more than 10% THD.
Onan has been around for a long time. I don't believe they would stoop to the point of reducing stator copper to where THD starts infuriating the clientele.
I am definitely not zeroing in on the poster. The inverter manufacturer design and spec department had and has their head somewhere where it should never go. There is a huge difference between an off-grid inverter charger and a UPS. A UPS can get away with claims of needing "perfect" input to charge batteries. An inverter with a charger on the other hand IMPLICATES it is going to be used with a generator.
This point should demonstrate the need for small generator manufacturers to concentrate on inverting output. The old 6.5 NH Onan produced relatively clean waveform.
But the inverter manufacturer is "generating" pure DOUBLESPEAK to the public. Converters built so poorly they cannot handle cheap generator waveform is included.
"We Never Intended For Our Super Duper All Terrain Tires To Be Used Off The Freeway!"
Sheesh!
