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Open Roads Forum  >  Travel Trailers

 > What size 2nd AC should I add 13.5 or 15

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jeremy0011

Fuquay Varina NC

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Posted: 03/07/12 08:09pm Link  |  Print  |  Notify Moderator

I found out the hard way that a 13,500 BTU AC is not enough for my 35’ outback 312bh in the North Carolina summer. So I’m going to add another AC in place of the factory skylight.

My question is Do you think another 13,500 BTU unit will be enough or should I get a 15,000 BTU unit. Normally I would spring for the larger unit but I’m trying to keep my amp load as low as possible if it’s not needed.

I will be converting to 50 amps but I often camp in campgrounds with only a 30 amp circuit and a 2nd 20 amp circuit. If I only have a 30 amp site then I will plug the second AC and my outdoor kitchen fridge into the 20 amp outlet on the pedestal. I know if the site has a 20 amp circuit I will be ok but if I find myself on a site where the 2nd circuit is only 15 amps I will be in trouble with a 15,000 BTU unit.


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SWD

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Posted: 03/07/12 08:17pm Link  |  Print  |  Notify Moderator

Well I would stick to the 13500 unit.

Twomed

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Posted: 03/07/12 08:17pm Link  |  Print  |  Notify Moderator

Given your outline for camping I would move the 13.5 to position of second a/c and make the 15k my primary. Been there done that in a similar situation. You will be surprised how much cooler the 15k will be. Then the 13.5 will be there for those super hot days...hopefully you will have power. A 15k will run on a 20amp if you manage all your other usage.


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donn0128

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Posted: 03/07/12 09:41pm Link  |  Print  |  Notify Moderator

Since you are adding a second AC unit, go for a 15K unit. Put it in the main living area and move the 13.5k unit to the second location.


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tvman44

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Posted: 03/08/12 06:04am Link  |  Print  |  Notify Moderator

I installed a 15,000 for our 2nd A/C as there is little difference in price or current draw. A 15 amp should run the A/C by itself but nothing else. So far all pedestals I remember seeing had 20 amp & 30 amp & the newer parks also had 50 amp. When we end up with no 50 amp I use the 30 & 20 amps with no problems, I upgraded our coach from 30 amp service to 50 amp when we installed the 2nd A/C now we have 2 15,000 A/C units and in the south LA heat and humidity that is what we need..


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eHoefler

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Posted: 03/08/12 05:57am Link  |  Print  |  Notify Moderator

Since you only have 30 amp service already, you most likely will not have the pre-wire for the second A/C. Plugging it into a 20 amp receptacle that may be in the pedestal next to the 30 amp probably won't fly if there is no 50 amp service. A 30 amp pedestal is only wired with one leg and is rated for a 30 amp total max load for the pedestal, regardless which outlet you use. A 50 amp pedestal is wired with 2 legs, 220 volt, with a 50 amp total load capacity. The 30 amp receptacle is wired into one leg with a 30 amp breaker, the 20 amp receptacle is wired into the other leg with a 20 amp breaker. Still under the max load of the pedestal, 50 amp.


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Bob Landry

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Posted: 03/08/12 10:34am Link  |  Print  |  Notify Moderator

OK, I'll throw in a wrench. Do some research and make sure the ducting in your trailer is the same for 13.5K or 15K. If its the same you're good. If the existing duct is sized for 13.5, you may run into air flow and icing issues with the larger unit. It pays to check it out.


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jeremy0011

Fuquay Varina NC

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Posted: 03/08/12 08:26am Link  |  Print  |  Notify Moderator

Thanks guys, 15k it is I will move the 13.5k to the new location and install the 15k in the ducted location. Who makes the best 50 amp distribution panel and where can I find it? Thanks for your help.

jeremy0011

Fuquay Varina NC

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Posted: 03/08/12 12:52pm Link  |  Print  |  Notify Moderator

Bob Landry wrote:

OK, I'll throw in a wrench. Do some research and make sure the ducting in your trailer is the same for 13.5K or 15K. If its the same you're good. If the existing duct is sized for 13.5, you may run into air flow and icing issues with the larger unit. It pays to check it out.



Good idea. I will check but it’s a factory option to have the 15k and I would assume the duct work in the ceiling is the same. I might need a few extra vents installed.

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