Since I used to buy and sell RV's Ive had a bunch and a 4KW Genny will operate a typical RV rooftop AC, 13,000 or 15,000 BTU. I've even had a few that only had around a 2750 genny that still started the AC but that was a 13,000 BTU not a 15,000 and that really crowded the genny when it started and was pretty marginal. However, the 4KW units never had a problem and you can even run the microwave while the AC was on which NO WAY with a 2750. IM NOT TALKING ABOUT ANY SORT OF SOFT START OR ADD ONS just typical run of the mill RV AC's.
MOST (never say never, depends on AC and genset, it is possible) of the guys (and I've seen a ton as I do a lot of RV travel and dry camping) who have the older Honda 2000 can not run a rooftop AC with much success, while the Honda 3000's I've seen CAN RUN A RV ROOFTOP AC. I see a bunch of them (Honda 3000) in the back of a pickup truck of guys that haul fifth wheel trailers with the gennys and AC units humming away.
Okay, most fairly modern smaller RV's have a 120 volt 30 Amp 10 gauge 3 conductor (Hot, Neutral, Ground) power cord that use a TT 30 P 2 Pole 3 Wire Grounding Plug. If the RV has such Ive seen some gennys that have the matching 120 volt 30 amp 2 pole 3 wire grounding TT 30 R 2 pole 3 wire grounding receptacle right on board you can plug your RV cord into. If not you would need an adapter that goes from a standard household type 120 volt 15 amp to the RV 30 amp receptacle, available even at Wally World and any RV shop.
Of course, larger modern RV's have a 120/240 volt 3 pole 4 wire grounding plug and 50 amp cord so they can run two 120 volt rooftop AC's, one on 120 volt leg the other on the other 120 volt leg.
Next, the guys that run those cheap loud screaming noisy Champion or cheaper brand of gensets aren't very popular with neighbors lol TOO LOUD and not nice n quiet like the Honda or Yamaha units, but of course, the good quiet ones cost a lot more.
BOTTOM LINE ADVICE FROM A VERY EXPERIENCED RV USER. Id suggest at a minimum a 3000 unit (like the Honda) or else a typical RV genset like an Onan 4000. I would NOT even consider a 2750.
Your money your choice so do as you like, NO WARRANTY ON THE ABOVE as there are always exceptions out there depending on the genny and AC units used and perhaps modifications, IM ONLY TALKING generic run of the mill typical standard units of which I've used or observed literally hundreds over many years. Others may have different experiences.
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