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Old 01-20-2020, 09:15 PM   #1
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Running 3 AC units at once?

Recently I've seen several high-end fifth wheels sporting three roof AC units. Because I'll be staying in Tucson this summer (in a 2016 Bighorn with 2 ACs), the idea of a third unit has my attention. If all three are 15,000 BTUs I believe that they would need something like 41.5 amps (13.5 x 3) when running together. I understand that they can't all be turned on at once because of start-up demand issues, but it seems like they should all run fine with a standard 50 amp shore connection. The downside I guess is that you probably won't be able to run, say, the water heater and micro at the same time but I think that should be manageable. Or maybe I'm missing something here, just wondering what more knowledgeable folks might think about this. Truth is, if all three can run at once I'm going to have a hard look at one of these fivers real soon.
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Old 01-20-2020, 09:22 PM   #2
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50 amp service is 50 amps at 240 volts.

You have 50 amp x 2, at 120 volts available to you.

2 A/Cs on one leg and the third A/C with water heater on the other.

That will still leave you about 20 amps on each leg for other stuff.

Some reading.

http://www.myrv.us/electric/Pg/50amp_Service.htm
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Old 01-20-2020, 09:27 PM   #3
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Yeah, I run 3 at the same time.
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Old 01-20-2020, 09:28 PM   #4
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On the 50 amp service you have 100 amps available so as long as the electrical panel breakers is put in based on balancing load per line I see no reason you couldn't.
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Old 01-20-2020, 09:35 PM   #5
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Thanks guys, much appreciated!
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Old 01-20-2020, 09:40 PM   #6
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On the 50 amp service you have 100 amps available so as long as the electrical panel breakers is put in based on balancing load per line I see no reason you couldn't.
They do the best they can, but with 3 A/C's, obviously 2 have to be on the same leg.
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Old 01-20-2020, 09:48 PM   #7
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What are you guys doing with 3 AC's running? Do you just leave your milk/cold drinks on the counter? We have 1 AC in our fifth wheel and even in 105F temps, the inside is bearable, low 80's with the humidity removed.
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Old 01-20-2020, 09:51 PM   #8
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They do the best they can, but with 3 A/C's, obviously 2 have to be on the same leg.
Yes that a obvious but you would be surprised at the number of time I’ve seen people that have just pop them in that don’t have a clue on balancing lines.
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Old 01-21-2020, 07:39 AM   #9
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What are you guys doing with 3 AC's running? Do you just leave your milk/cold drinks on the counter? We have 1 AC in our fifth wheel and even in 105F temps, the inside is bearable, low 80's with the humidity removed.
low 80's in summer dont cut it for me or my shih tzu. we have 70-72 year around and it gets very hot and very cold in OK. 105-112 air temps plus 70% humidity are common here. I dont have 3 but my rog will do it with two. Even at 45ft long

Based on observations many rigs need 3 A/C in the summer here. I see this walking around the campground. and many cant stay cool even then
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Old 01-21-2020, 07:42 AM   #10
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Won't be a problem on a 50 amp plug in if the circuits are split intelligently. Which is not always the case.
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Old 01-21-2020, 09:29 AM   #11
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Id look and buy better builds then try and put a band aide on a bleeding wound adding a 3rd air.
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Old 01-21-2020, 09:52 AM   #12
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I live in Tucson. You'll be miserable in that trailer in the summer heat of Tucson. You may have 3 a/c running but the thin walls of your trailer and single pane windows won't keep the heat out. We used to go boating and camp during the summer heat. My Voltage never got below the 80's inside. My advice is to find a condo or motel for your stay if you want to be comfortable.

My Voltage has 3 a/c and there is a management system that lets all three run but only two of them have the compressor going. The system alternates between the three.

One other thought, most all of the area RV parks close for the summer season - people just don't camp in Tucson in the summer.
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Old 01-21-2020, 10:03 AM   #13
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One other thought, most all of the area RV parks close for the summer season - people just don't camp in Tucson in the summer.
I have been there for work in the summer and people just don't come out at all in the summer during the day.

Everything is done from late evening through the night including Golf and Baseball.
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Old 01-22-2020, 04:02 PM   #14
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Id look and buy better builds then try and put a band aide on a bleeding wound adding a 3rd air.
I think you could even ask your wife this one. $1000.00 for new A/C or at least $25,000.00 dollars or more, likley more, likley much more for a "better build" unit cause you could use it for a couple of months a year and the electicity is free. I`ll bleed thank you
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