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Unless you are running it maxed out + the sensitive electronics I wouldn't worry about it, the harmonics as you see with no load is about ~4% which is fine, it probably doesn't start distorting alot until under a 60%+ load, if you want to condition it tho obv will not hurt anything and everyone...

they are indeed terrible but easy to buy for like $50 bucks a pop repair them (generally just lack of maintenance) and flip for $200 after a good wash, oil change, re adjustment of governor and avr pot and load test.

No surprises all pretty clean except 831 with gen head I don't think I've ever seen a single cylinder non inverter generator ever under 9% THD, all the crappy throw away portables (by this i mean the typical tube cage honda clone engine with an "insert name of place you bought it from here"...

I'm trying to talk myself into buying another set and you are ruining it lol

Except we are discussing swapping the MEP-831a from an inverter running an extremely clean ~1.1% THD to a normal genhead which increased THD to 11.8% which is a 1000% increase in dirty power lol especially when the IEEE 519 recommends not using sensitive devices on anything higher than ~5% THD...

There is a nice write up here https://electrical-engineering-portal.com/harmonics-influence that will explain the negative effects on multiple different types of devices like even normal motors will run hotter than normal, degradation of fuses etc It isn't that all these devices will not run on...

mep-831a is the cleanest by far, since single cylinder I'm sure that's why they decided to use an inverter...its a shame they are a pita, I am looking to buy one on sunday fully working for $800 (hopefully) and was curious the THD if/when I am forced to swap out the inverter but if it is going...

11.8%!!! oh lord thats worse than my harbor freight predator 9000 at full load (9.6%), we now know what not to plug sensitive devices into haha...very much appreciate you taking the time to do this I wanted alot of this info for awhile now but only have an 803!

The 803 should be a bit better than the 802(probaly only noticeable under a load as no counter magnetism slowing down motor under no load), what causes the distortion is the engine slowdown/speedup inbetween powerstrokes of each cylinder so generally the less downtime of a powerstroke the more...

Perfect and thanks for the results, I figured the 831a would be the cleanest with an inverter and the dirtiest without one since single cylinder engine, however when you get time can you post the 831a under a load aswell as that is obviously when the distortion matters, 3-4% is pretty typical on...