Total harmonic distortion (THD) of portable generators
I’m looking for some insight on the total harmonic distortion (thd) metric for portable generators. I currently own a new Westinghouse WH7500E Generator which is 7500 continuous watts and 9k peak watts. However, it has come to my attention that it has a 9% thd. As such, I’ve become a bit paranoid that it will do damage to the electronics in my home and fail to adequately operate the variable speed blower on my furnace.
My panel is wired with a 30amp inlet and an interlock kit.
My question is how a manufacturer can state a specified thd figure when it is pretty much all based on the rpms which are not electronically governed like standby or inverter generators.
I was considering buying a Briggs and Stratton 8k running/10k peak model because they state a thd of 3-6%.
Isnt thd largely dependent on different loads initiating and the rpm engine at that time? I don’t understand how Briggs can claim a lower thd number than the Westinghouse model. Am I overthinking thing entire thing?
Lastly, whether I keep the Westinghouse generator or move on to a Briggs, will the installation of an aftermarket natural gas kit have a material impact on the frequency or thd of these generators? I know there’s an adjustment for the air/fuel ratio but I don’t want to install it if it will negate the manufacturer’s stated specs for thd.
Thanks in advance for the information!