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Old 07-19-2023, 06:59 PM   #1
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Adding 2nd AC to Minnie Winnie 31k

Hey everyone, looking for advice and someone who has accomplished the task.

So far I have found no one to install.

Need to add a 2nd AC to a 2019 Minnie Winnie 31K, in the bedroom.

I realize being 30amp, I will need to run a 2nd 20 or 30amp outlet and will not run on a generator etc.

However, no dealer or repair facility wants to even attempt the job. It seems easy, as the rear ceiling vent is close to the rear closet and I do not mind the wires being run in a cable hide thing on the ceiling.

Am I'm missing something?

Has anyone done this and had success or failure or is it not viable.
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Old 08-02-2023, 08:53 PM   #2
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Welcome!
IMO, yes it is entirely doable. You are aware of the 30A limitations, so no issue there. You have a vent in the bedroom so a RV rooftop A/C unit will be a drop-in installation. You already have the wiring figured out, no problem there either.
I would call a mobile RV repairman. The only hard part is lifting an A/C unit onto the roof without damaging anything.
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Old 08-02-2023, 10:20 PM   #3
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Hi Jujubeadz & Ray,
So if I understand your plan correctly, you would run a separate 20 amp outdoor-rated extension cord to the new air conditioner, right? Every RV Park outlet I have seen have both the 30 amp service and the 20 amp service alongside, so you could just plug-in both.
The 50' 12 gauge outdoor-rated extension cord would be hard-wired in with what was the female end to your air conditioner & routed across the ceiling and then down through the closet. Coiling & stowing the excess with the male end in a compartment on the camp-side could be easily accessed when needed. Since you don't involve any other wiring in the motorhome, you can just rely on the 20 amp service outlet's independent circuit breaker.
I like your idea. Please take pictures so we can see the results.
Thanks, Eagle5.
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Old 08-03-2023, 02:18 PM   #4
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A was thinking about installing this on the RV exterior wall and running the A/C romex directly to this exterior box. https://www.amazon.com/WELLUCK-Water...093547&sr=8-15
Then a 10ga extension cord could be used when the 2 A/C unit was needed.
That would be very safe-labeled of course.

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Old 08-03-2023, 02:51 PM   #5
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Hi Ray,
I like your idea better. 12 gauge romex would lie flatter and be easier to route.
I believe you cannot buy a 10 gauge 20 amp 120 vac extension cord; isn't that right? Would not 12 gauge be sufficient for up to 20 amps?
Thanks, Eagle5
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Old 08-04-2023, 10:29 PM   #6
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Yes 10ga 15A extension cords are normally used by tradesmen, as they are expensive, just look at them on Amazon. However, I do think you are right about a 12ga extension cord, if they limit the length. a 12ga 50' cord will have a 3.29% voltage drop.
The only difference between 15A and 20A extension cords are the end prong configuration.
The wring in the trailer is 14-2 W/ground, so that's what is needed for the 2nd A/C unit.
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Old 02-25-2024, 05:41 PM   #7
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So, an update to the ac. Just purchased a Coleman Mach 15 and and the cables and such. Going to tackle over the next month.

Still trying to figure the best place to mount the plug and run the wire.

Hopefully I’m able to determine where the vertical aluminum studs are in the exterior wall.

I’ll post pics as I go.
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Old 02-25-2024, 09:42 PM   #8
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Quote:
Originally Posted by Jujubeadz View Post
So, an update to the ac. Just purchased a Coleman Mach 15 and and the cables and such. Going to tackle over the next month.

Still trying to figure the best place to mount the plug and run the wire.

Hopefully Iím able to determine where the vertical aluminum studs are in the exterior wall.

Iíll post pics as I go.
Rent/borrow a stud-finder, the new models detect metal or wood studs.
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Old 02-26-2024, 12:36 PM   #9
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IIRC, the 31K is very similar to the 31BE class A. If not you can ignore this:

I pondered this with our 31BE. My plan was to run the wire into the cabinet over the bed and down the cabinet against the rear wall into the storage in the passenger side. From there, I was going to cross over to the electrical bay and put an electrical box and cable.

My bright idea was going to use a long extension drill bit to run the wire inside the roof foam into the cabinet. Using an appropriate chase between the AC and the cabinet would be a lot easier.
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