Cajunco, sometime you can have a separate plug for the new A/C and not have to change the whole coach to 50 amp. It all depends on how much you want to spend.
I have a 30 amp connection in my storage garage and popped the breaker the minute I turned on my second air. It might depend if both units try to start at the same time.
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Also, keep in mind that if your '88 motorhome is 30 amp, you can probably only run one air at a time.
And, I also vote for the bedroom for the new location just for balance.
I have Seen lots of guys on here say they have 2 AC's on 30amps.. but if i have to i will change to 50amp.
The only thing i will have running with both AC's are on is the TV.
I will give it a try on 30amps in hopes that will work for both ac's ..
I think most of those dual a/c units on 30 amps will probably include a Load Managment System. You can add this if you want. It basically rank orders the high draw items... It will prevent both a/c units from starting at the same time. Induction coils measure the a/c load on individual items...and for example will shed the water heater, in favor of the second a/c unit.
The 50 amp conversion would be another idea.
What I'm likely to do is to install a weather-resistant 20amp Inlet box inside the pinbox... route that to a breaker/(fuse) box inside the basement area on our 5th wheel...to protect the circuit...then wired up to the a/c unit.
In the long run...having it run this way will do two things. Prevent the cost of a replacing the 30amp system with a 50amp system...which would be umbilical, inlet, wiring to the new distribution panel, a new distribution panel, a new converter that's compatible with the 50 amp panel, etc...
The second advantage of doing it this way...it if we were running late into the night...I got tired driving...and it's Summertime HOT out. I could have a portable generator in the bed of the truck...connect the bedroom a/c alone to the generator...and spend the night along the way with minimal hassle. We've only done this once...as we usually will plan our stops to include a state park or private park with at least water/electric hookups. But it would add an option. There are also some rallies that I would like to attend that have no hookups at all...and having at least one a/c unit working on a generator for a few hours now and then would be nice. We can get by on propane for most other things.
Cajunco, we have 3 A/C's that are also heat pumps. I went to the Monaco site and it says that we have 'Three low-Profile Ducted 15m bTu Roof Air Conditioners with Wall Thermostat and Heat Pump (42’ and longer Floorplans Only)'
Some say put it in the living room, some say the bedroom.....I think the best place to put it is up top, on the ROOF........just sayin....Dennis
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One way those people run two ACs on 30A is that they have the newer high efficiency ACs along with a system that 'sheds' loads when one of the ACs switches on. Those systems also toggle back and forth between the ACs. This prevents too much loading when the ACs try to start up.
With a 1988 rig, it would be much easier, safer, and far less expensive to wire into the genset distribution box with a rewiring that uses an extension cord to run to a 20A circuit provided by the RV park for the 2nd AC. IMO.