In the past, I've run my Airstream trailer's Air Conditioner (I believe it's a 13,500 BTU) using a Honda EU2200i generator without issue. I recently upgraded my electric system to include a Victron MultiPlus 12/2000. I have the 'shore power' cable running directly to the AC input of the multiplus (no automatic transfer switch), and AC out running directly from the multiplus to the AC panel.
In inverter mode and in pass-through mode (with the generator running), I can run all AC appliances without issue. The one exception being the Air Conditioner. Every time I turn that on, it gives me an 'overload' error. If I have the Multiplus in inverter mode (with the generator running), the inverter makes a loud 'inverting' noise, and shuts down due to overload error. If I have the multiplus in 'pass-through' mode, it doesn't make the loud noise, but still shuts down the system.
I had assumed that when in 'pass-through' mode, the generator would behave exactly like it did when it was wired directly to the panel. Clearly, that's not the case. I've tried increasing the input current limit (tried the max of 50A), with no change. Also tried inverter mode with and without the 'PowerAssist' enabled, again with no change.