[Columbotrek]

My UPS APC and Cyperpower care about voltage and frequency (60Hz =+- 2Hz) Get those right and what ever THD is there, they have not cared. The THD story is more than distortion from the power source but includes the trash reflected back onto the line from reactive loads.

 

[Columbotrek]

Here's my Onan 4.0 BF 4000 watt generator made in 1977. It's my backup and the first generator I used my new meter on. If I'm reading the meter correctly, the THD shows 6.0 at about 2800 watts. HZ was 60.33. Not as good as an Inverter gen, but not too bad for $100.


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Looks like a generator typically installed into an RV.