Join Date: Dec 2019
Location: West Boston suburb
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Apparently, the Honda eu3000i doesn't have over voltage protection? Geez. I never thought about that and am very surprised.
That model Honda has a single alternator output winding. The output voltage is regulated by the inverter controller using a feedback circuit. I think you're going to need a service manual, along with a CD - Circuit Description- to troubleshoot this unusual problem. Or, at least, someone with knowledge about how the Honda inverter circuit works (you might be able to find this by Google searching).
One thing: Is your voltmeter (DVM) a "True RMS" type? If not, then a/c harmonics can erroneously skew the voltage reading and send you off scratching your head.
Hopefully, somebody else will have more insight. Wishing you good luck!