So, looking at the link posted above by SSki, I see Onan states on page 3,
"1996 Introduction of the FIRST variable speed inverter based generator"
I would think since Onan made the statement in their own product manual they would know what they're talking about. I sure wouldn't expect them to publish such a false claim for all these years.
The OP may or may not know what they are trying to say but I gotta' go with Onan on this one. Looks like Onan has had inverter based generators since 1996.
Maybe they've recently come out with some newer model inverter based generators but 1996 is still when they came out with the "FIRST" one. Only one can be first.
I'm also unsure how the OP's experience with lithium batteries makes him an expert on Onan generators. :h
