Yeah, our Champion 3100 runs our AC unit without a hint of duress, even on eco-mode and at high elevations. Noticed that the Champion did indicate the same issue on my 120VAC monitor, I just silenced the alarm on the monitor and have already put over a 100 hours on the genny since I purchased it last April. Have an Onan onboard that has never set-off the AC voltage monitor with this issue, after a decade of ultra-dependable service, it was major overkill for most of our power needs.
Saw a deal on the Champion 3100 with remote start that I just couldn't pass on, just like the Onan, a quick press of the remote and away she goes. The Champion puts out a solid 122 volts whether powering our AC or hardly anything at all. The Onan would drop a few volts if under heavy demand, not enough to matter, just something I noted over the 1K plus hours of use. Currently looking for our next rig which will not have an onboard genny, I feel confident the Champion 3100 will serve us well for many years to come.