Running 2 AC units on 30 amp

Last DRV with two AC's I had no issue running both AC's on 30A. Turned frig and WH to gas.

Good point brought up about the 30A Pedestal at the camp ground.

You are obviously going to loading down this 30A service big time and since these get a lot of use by all of the 30A trailers the 30A connector may have been over heated and maybe even arced over a couple of time...

Look for burn marks around the connections and if you see them request another site - do not try to use the 30A connections that have obvious burn marks on them...


Google image

Using this burned socket will make your 30A side of your RV30A to 50A long DOGBONE adapter cord look like this in short order and will need to be replaced...


Google Image

The campgrounds are suppose to keep their equipment in good working order but with all of the high use you can imagine how hard this must be for the campground owners...

Keep a close eye on heat build-up in your cords.

Roy ken

I don't suppose maybe the rear mounted air conditioner has its own 120VAC PLug accessible... If so you could use an extension cord running to the camp ground pedestal and plug it into their 20AMP Service plug. This will draw from a different 120VAC zone and not draw from your 30AMP connection zone.

Using the 30AMP zone for both air conditioners is really going to power down your service. It may even get down to just having your converter/charger ON and both air conditioners. The real necessity for me would be to have lights and HDTV and a couple of fans - Maybe the fridge but that can be solved with a 5-day ice chest hehe... Run everything off of PROPANE that you can (Including the Hot water heater)... It still will want to see some 12VDC power for control boards that will be provided by the converter/charger and/or the battery don't let the battery get below 12.0VDC etc... Your battery should be charging when on shore power as long as the converter/charger in ON...

You also should consider that each of your two air conditioners are wired to your separate 50A 120VAC zones. You will have to make sure your RV30A to 50A long DOGBONE adapter will power up both of your 50AMP zones in your trailer.

Sort of like this diagram shows...



Note the RV30A to 50A long adapter has the two HOT zones wired together in the adapter like shown here... Some of these adapters may only be wired to one of your 50A zones... Something to check on...


DMBRUSS.com images

When plugged into the 30A Service at the campground pedestal will power up both of your 50A Zones but will only have to divide both zones with 30A of power. You will want to flip a few breakers OFF in the 120VAC power Distribution Center to make sure you will not power up too many high wattage items otherwise it will trip the Campground 30A Pedestal breaker. This would really help if one of your 120VAC Air conditoners has it own 120VAC Power cord available to plug into a standard 20A Receptacle. Then you could use the Camp ground 20AMP Service with an proper size extension cord and allow more items to be powered up on both of your 50A zones being powered by only a single 30AM 120VAC shore power connection.

If you 50A trailer has the washer/Dryer setup please note this may be a true 240VAC operation just for the washer/Dryer combo and will not work at all from using the RV30A to 50A long DOGBONE type adapter. Not living in this high-end world I have no idea what would happen if you tried to run those two units from a single 120VAC zone shore power source...

I have also heard some stories about GFCI breakers tripping when using the RV30A to 50A long DOGBONE Adapter... This may have something to do with any surge protectors your 50A Trailer setup is using...

Maybe others on here that has actually done these things will dime in with more info..

Just things to know about and check on...
Roy ken

If you put the fridge and water on propane only I would give them a go. Maybe wait an hour or two for the battery to be full charge before you try the second. And of course don't start them at the same time. No MW, hairdryer, electric coffee or toast etc. New units are getting more efficient and may draw less power. Check your adapter is not melting from a poor connection to the worn out pedestal connector and always good to check voltage stays 108+ in the RV. If the main breaker trips off just reset and keep one off from that point.

We camp lots of places with 30 Amp hook-ups using an 30/50 adapter. We just run the front AC during the day and at night shut it off and turn on the bedroom AC if needed.

In absence of a PMS as mentioned above, you are likely going to be limited to 1-AC at a time on 30 amp service.

First question to ask the tech on this subject is does the mh have an Electrical Management System. I would think that it does but could be wrong. Next question is how to use it to allow both units to operate on 30 amps. The system should look at all power usage and if sufficient power is available then let them both run, otherwise it allows one to run, and if both are running and you want to use another appliance shed one of the ac's. that's my understanding anyway.