Plug into a normal 20A circuit at home and try it without using other major appliances/devices (fridge off, water heater off electric, house batteries more or less charged so the converter isn't working overtime, etc.). The air conditioner on its own is fine on a 20A circuit; it has one in the RV, in fact. It's just the total of the air conditioner plus not very much else that could overload it. If all you have are 15A circuits, that could be a difficulty.
If you have an appropriately sized generator, you can check both at the same time.
