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mbopp

Henrietta, NY, USA

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Posted: 02/07/18 05:00pm Link  |  Quote  |  Print  |  Notify Moderator

I ran a dedicated 12ga 20A circuit to my garage for the TT. I can run the AC with only a few volts drop on the line, but still above 110V.


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CavemanCharlie

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Posted: 02/07/18 05:12pm Link  |  Quote  |  Print  |  Notify Moderator

You can run it off of a 20 amp circuit. But, I would recommend that you purchase a voltage meter to plug into a outlet inside the RV to make sure that you have enough voltage. It's not a bad idea to have one anyway. Some parks have low voltage problems even though they have the proper 30 amp plug on the post.

pianotuna

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Posted: 02/07/18 05:23pm Link  |  Quote  |  Print  |  Notify Moderator

Hi,

If the voltage stays above 107 when running the air conditioner all is well. Be aware that amperage demand may increase the longer the unit runs.

My 13500 btu air conditioner starts out at about 1100 watts and peak continuous demand is 1900 watts.

Maximum continuous load for a 15 amp circuit should not exceed 1440 watts.

I do often use an autoformer to boost voltage so that I may safely run the roof air from a 15 amp source. The lowest shore voltage I've run it at (with autoformer boosting on the RV side) is 97. The autoformer did a 20% boost so I should be safe down to 90 volts.

As the day progressed and it became hotter, the extra amperage demand eventually caused the shore power breaker to trip.

* This post was edited 02/08/18 07:12pm by pianotuna *


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drsteve

Michigan

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Posted: 02/07/18 05:31pm Link  |  Quote  |  Print  |  Notify Moderator

One of our favorite parks has only 20A service, and it runs my 13.5K AC just fine. I also use a 20A outlet at home, no problems.


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wa8yxm

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Posted: 02/07/18 05:42pm Link  |  Quote  |  Print  |  Notify Moderator

Well many run one A/C on 20 amps. I did no problems. BUT do not try to run much of anything else and make sure batteries are full up.

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If you do wire a 30 amp outlet (Consider putting in a 50 instead, more in a bit) Make sure the electrician knows it is a 120 volt outlet.. NOT a 240 volt, Have him show you that it is 120 volt by metering the two FLAT slots (No lead to the round hole) make sure the circuit breaker is a sigle, not a dual ganged.

Now why did I say consider a 50.. All those warnings do not apply to a 50 amp outlet, the electrician will install it PROPERLY, no problem.

use a dog bone

IF you are worried that the cord will not be properly protected, Have him put in a 50 amp outlet and the proper feeder wire,,,, but only use 30 amp breakers.


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Cummins12V98

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Posted: 02/07/18 06:25pm Link  |  Quote  |  Print  |  Notify Moderator

STBRetired wrote:

Before I put in my 50A receptacle, I would run one of my 13.5K A/C units on a 20A circuit. I needed to use a 10GA extension cord to avoid excessive voltage drop.


Within the length of a 50' 12ga extension cord all would have been fine.


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nineoaks2004

Florida

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Posted: 02/07/18 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

I always run a 30 A circuit, with a breaker box near. It takes the same amount of time and very little extra costs.


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Colorado #5

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Posted: 02/08/18 07:16am Link  |  Quote  |  Print  |  Notify Moderator

This is all good stuff guys. thanks a ton!!! I'm considering wiring a 30amp outdoor box but hadn't thought to wire for 50amps instead. That gives me room to grow if we ever get a different coach. I'm a little foggy on testing for voltage drop. Can someone elaborate on that process? I do that in the coach while running the AC? With just a regular voltage meter?

STBRetired

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Posted: 02/08/18 07:21am Link  |  Quote  |  Print  |  Notify Moderator

Yes, measure the voltage inside the coach with the A/C running. A standard volt meter will be sufficient.


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Bobbo

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Posted: 02/08/18 07:40am Link  |  Quote  |  Print  |  Notify Moderator

Use a digital volt meter. An analog volt meter won't be accurate enough.


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