Generator Size

I have a Dometic B3000+ air conditioner and run it on a Honda 2.0 with a short 20amp lead (minimizes voltage drop) the Honda runs the AC but is under considerable load, fairly noisey if you are near other camps. One piece of advice, DON'T buy a cheap generator.

The Honda eu20 will run your a.c but at full revs and it will use a 1lt of fuel an hour, so be prepared to get up in the middle of the night to re-fuel. Also make sure you turn off your battery charger and electric hot water system. With the cost of fuel now we found it just as cheap to stay in a Caravan Park for the night.
Cheers
Rick P

Air conditioner usually take more than 2 times the rated output for starting up. So you need one that can cope around 2.5kw surge. Honda 2.0 seems to be the only one that can take higher surge than its rating. However, there are portable generator that goes up to 3kw and not as bulky as honda eu30i. I suggest looking into those as I have seen a few which was pretty impressive. If you have the extra bucks to spend, Honda will not let you down. Otherwise, you can get a reasonably good quality 3.5kW generator for 40% of what a Honda EU20i woulda cost

A Yamaha 2.4 will do the job and then some. Fantastic reliable unit.

If you really have to run a air conditioner all night when you go "camping" then in my opinion you should stay home in your comfortable house and not annoy others with your noise....bad enough next door to one in a caravan clattering away with listening to one out in the bush...cheers

The Honda 2 kva struggles on some caravan air conditioners.
A 2.4 kva Yamaha is a better choice for the larger van’s air conditioner’s