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Old 08-01-2014, 08:41 PM   #1
Join Date: Jul 2014
Location: Vail
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Running the A/C with lower Amps

During our last trip, we spent a few days at a friend's house. The friend was nice enough to install a 30A socket for us; however, the socket was on a 20A circuit.

I was able to successfully power the 15k BTU A/C without tripping the breaker, as long as the water heater was running on propane (water heater would trip the 20A breaker). Both my fridge and A/C were running on the 20A circuit.

Am I potentially causing damage to the A/C by running it on a 20A circuit? If the A/C needed more than the 20A, then it would just trip the breaker right?

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Old 08-01-2014, 08:48 PM   #2
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Probably not, if the voltage stays at 120 in your trailer when the A/C is running. Look in your electrical panel, if the A/c is on a 15 amp breaker then you are good to go. If you are worried, run the fridge on propane as well then it only uses some 12 volt power for the controls.

If your voltage drops below 110 when the unit is running you could damage the A/C.

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Old 08-01-2014, 09:36 PM   #3
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If the supply voltage drops below its requirement, the amperage draw goes up. So you'll trip the breaker before damage will occur.
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Old 08-01-2014, 10:39 PM   #4
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Generally they say anything that has a underwriter labratory label will run safely if the voltage is within 5% of 120 volt
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Old 08-02-2014, 06:15 AM   #5
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Agree with all of the above. Been running the a/c on 20 amp breakers (when forced to, Rallies at fairgrounds or at home) since 1977 with no issues. Also some of the newer a/c units will shut the compressor off on low voltage conditions.
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Old 08-02-2014, 07:17 AM   #6
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We successfully ran the A/C and Fridge using a 20A circuit (I used a Dog-Bone adapter) quite a few times when we owned the X23B. I don't recall having the TV on at the same time tho. A 15A circuit would not run the A/C.

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Old 08-02-2014, 07:40 AM   #7
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Thanks for all of the responses. This gives me peace-of-mind.

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