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Old 07-28-2015, 06:43 PM   #15
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The National Electric Code states that a circuit breaker can support only 80% of the breaker rating as a full constant on load. So a 15 amp breaker is rated only for 12 amps continuous load. An air conditioner causes a power surge during startup and for a few micro seconds the current draw can easily exceed the amp capacity of the breaker and then the current draw drops to run mode. Thus if the air conditioner cycles, there may little or no spare amp capacity for the other items that are also running on the circuit.

By using a #12 gage wire extension cord to the external power source, there will be less voltage drop and increased amperage draw and less chance of tripping the breaker at the power source.

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Old 07-28-2015, 10:06 PM   #16
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Linked here is a thread where I measured current draw with my kill-o-watt. I was plugged in at home into a 20 amp circuit. No problem running the AC at an acceptable voltage.

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Old 08-08-2015, 08:15 AM   #17
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All - thank you for the good responses and discussion. Turns out the 15 amp service as quoted on-line is actually 20 amp. We hooked up yesterday evening about 5PM and everything is working well. Temperature was in the 70's with a nice breeze off the lake, so we did not need the A/C. Today's high is in the 70's and my try the A/C just to check out. Our A/C is on a 20 amp circuit.
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Old 08-08-2015, 08:38 AM   #18
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A side note: How the Wally Byam caravanners made it through the African plains is a marvel to me. 2-30 A/C, 2 windows down, 30mph.
We have it good.
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Old 08-08-2015, 12:14 PM   #19
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Here are my draws...

Nothing on

Refrigerator only

Refrigerator and all interior lights

Air Conditioning and everything above

My AC is an original Armstrong 11,500 BTU, not super efficient... But it is reliable!

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The fact that I am opinionated does not presuppose that I am wrong......

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