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Old 06-29-2009, 08:35 PM   #1
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Two AC Units on 30 Amp???

Any time you see a motorhome or large trailer with 2 AC units the rig is usually wired for 50 amp service.

My question is: What's the trick or hardware necessary to run 2 AC units on 30 amps? I know it's been done.

Thanks,
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Old 06-29-2009, 08:54 PM   #2
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One at a time, or two 30 amp connections.

Andy suggested adding a second 30 system for a second AC when I was considering that addition. It would be easier than converting to 50 amps. You can use a 50 to 30 amp adapter to power one of the 30 amp systems since most (all?) sites with 50 amp connections also have 30 amp service.

I haven't added the additional AC and 30 amp system, but this time of year I get that funny gleam. In the evenings when the sun sets, the 15,000 Btu Carrier I put on (see http://www.airforums.com/forums/f427...ead-40795.html) keeps it very comfortable.

In the worst conditions, lots of direct sun and high temps, I close off the bedroom and wear shorts and minimal shirts. Fans also help, but I really am gone most if the time during the day.
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Old 06-29-2009, 09:08 PM   #3
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Quote:
Originally Posted by vswingfield View Post
One at a time, or two 30 amp connections.

Andy suggested adding a second 30 system for a second AC when I was considering that addition. It would be easier than converting to 50 amps. You can use a 50 to 30 amp adapter to power one of the 30 amp systems since most (all?) sites with 50 amp connections also have 30 amp service.
That's an elegant solution I hadn't thought of.

Thanks,
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Old 06-29-2009, 09:16 PM   #4
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Quote:
Originally Posted by Steve Heywood View Post
That's an elegant solution I hadn't thought of.

Thanks,
Hi Steve,

I liked it too. Wiring in a second 30 amp cord and adding another smaller breaker box is much simpler (read that cheaper too) than going through the extra hassle. Of course there will be the need to deal with two cords, but that could be part of the arrival show. "Hey look, that guy has two cords on his!"
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Old 06-29-2009, 09:38 PM   #5
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Hi Steve,

I liked it too. Wiring in a second 30 amp cord and adding another smaller breaker box is much simpler (read that cheaper too) than going through the extra hassle. Of course there will be the need to deal with two cords, but that could be part of the arrival show. "Hey look, that guy has two cords on his!"
As I see it the most difficult part would be snaking the wiring up to the rear AC unit. I would add an exterior plug (like the newer units come with) at the rear of the coach for the extra 30 amp cord. Most of the time the second AC unit wouldn't be needed and neither would the second 30 amp cord.
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Old 06-29-2009, 09:47 PM   #6
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Quote:
Originally Posted by Steve Heywood View Post
As I see it the most difficult part would be snaking the wiring up to the rear AC unit. I would add an exterior plug (like the newer units come with) at the rear of the coach for the extra 30 amp cord. Most of the time the second AC unit wouldn't be needed and neither would the second 30 amp cord.
My thinking exactly!

I was also thinking about trying to snake some speaker wire across the inside of the living room. Smaller wires, but the same problem in miniature. If I get any blinding insights for either, I will let you know.
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Old 07-05-2009, 02:03 PM   #7
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Instead of 2 - 30 amp services, use the 2nd air on a dedicated 20 amp cord. Most campgrounds that I have been to have a second 110 V 15/20 amp circuit at the powerpole, plug into that one for the 2nd AC.

I did this on a 34' Class A that was dual air, 30 A. Originally the rear air would ONLY run when the Genset was on
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