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Old 06-20-2013, 10:42 AM   #21
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Originally Posted by jeeplj8 View Post
As I did want to to run the A/C for a little while packing up, I went ahead and dropped 133 on a 10/3 extension cord at HD. I justified that expense by buying a new grill while I was there.

The 10/3 is capable of carrying 20 amp that far, and it ran fine for the hour I wanted to load everything in. It is heavier per foot than 30 amp RV cord, which I thought was interesting.
Part A - Yes, it happens to me all the time...

Part B - Yes, 20-25 amps in 100 feet of 10/3 is quite doable (I do that at my buddies farm).
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Old 06-20-2013, 10:56 AM   #22
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Herk is right in his first statement. But to expand on that, when you first start drawing current through the 50' Home Depot cord, it is cool and resistance is low. Thus you will see very little voltage drop across that cord and the AC will be within the 20 amp draw that it needs to run at the house and RV breakers. Over the next ten minutes though, the cord heats up, and this provides more resistance. With the added resistance, there is a larger voltage drop across the cord. As it was stated earlier, the AC wants the same amount of watts. So therefore, since voltage at your house outlet is still 115-120, it's only calling for 18 amps plus maybe an extra amp or so to keep the cord hot while at the RV breaker, you just hit 20.5 amps.
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Old 06-20-2013, 11:07 AM   #23
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Originally Posted by wneise View Post
Herk is right in his first statement. But to expand on that, when you first start drawing current through the 50' Home Depot cord, it is cool and resistance is low. Thus you will see very little voltage drop across that cord and the AC will be within the 20 amp draw that it needs to run at the house and RV breakers. Over the next ten minutes though, the cord heats up, and this provides more resistance. With the added resistance, there is a larger voltage drop across the cord. As it was stated earlier, the AC wants the same amount of watts. So therefore, since voltage at your house outlet is still 115-120, it's only calling for 18 amps plus maybe an extra amp or so to keep the cord hot while at the RV breaker, you just hit 20.5 amps.
18 amp draw at start up maybe.

12.5 running.

My 13.5k has never seen 15 amp running
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Old 06-20-2013, 11:42 AM   #24
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I wired up a 30 amp RV outlet to the outside of my garage nearest the camper. I used a #10 awg wire and a 30 amp 110 breaker. I also bought a 30 foot 30 amp RV extension cord and have no problem running my AC in the camper. You can buy the RV outlet at Menards, Lowes or Home Deopt for about 30 dollars.
Just remember its 110 NOT 220.
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Old 06-20-2013, 11:47 AM   #25
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Originally Posted by f1100turbo View Post

18 amp draw at start up maybe.

12.5 running.

My 13.5k has never seen 15 amp running
And that's at 115 volts at the RV panel.
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Old 06-20-2013, 11:49 AM   #26
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And that's at 115 volts at the RV panel.
75' rv cord plugged into my shop.

Directly off my ems monitor in the camper.
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