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Old 07-31-2016, 07:50 AM   #31
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Is the EMS the surge protector?
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Old 07-31-2016, 07:58 AM   #32
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Is the EMS the surge protector?
Yes it is...Electrical Management System
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Old 07-31-2016, 08:02 AM   #33
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Yes it is...Electrical Management System
Thanks, Jim.
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Old 07-31-2016, 08:09 AM   #34
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It's not that you use a 15,20,30, etc. sized circuit that is important. It's the voltage drop that occurs when the AC compressor kicks in and pulls max amps. The resistance of the wiring from the current source (usually the main breaker of the supplying power panel) to the AC compressor motor is what causes the voltage drop. Unless you want to get into integral calculus, Ohms law expresses the relationship of the voltage, current, and resistance of the circuit. (V = I x R) Since you can't change the voltage or current, the only variable that you can change is the resistance and you do that by changing the wire size supplying the AC power. Increasing the wire size lowers the resistance and reduces the voltage drop.

A typical 15 amp 120v circuit uses 14 gauge wiring, a 20 amp uses 12 gauge, and a 30 amp uses 10 gauge. So the higher the amp rating of the circuit, the larger the wire size supplying the outlet.

But that is only part of the story as the power cord from the outlet to the AC is part of the circuit. The resistance of the wiring circuit is the sum of all the wiring sections - so a 20 amp outlet with a long 14 gauge extension cord could have enough voltage drop to harm the AC compressor.
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Old 07-31-2016, 08:14 AM   #35
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Long story short -
If you want to get the lowest voltage drop, don't use an extension cord to plug your trailer in. Pull out your power cord from the trailer enough to reach the power outlet and use the 30 amp to 15 amp adapter at the outlet. This will give you the lowest voltage drop possible using a 15/20 amp outlet.

The same applies using a 30 amp circuit, plug the power cord from the trailer directly into the outlet. Any extension wiring will increase the circuit resistance.
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Old 07-31-2016, 09:54 AM   #36
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Long story short -
If you want to get the lowest voltage drop, don't use an extension cord to plug your trailer in. Pull out your power cord from the trailer enough to reach the power outlet and use the 30 amp to 15 amp adapter at the outlet. This will give you the lowest voltage drop possible using a 15/20 amp outlet.

The same applies using a 30 amp circuit, plug the power cord from the trailer directly into the outlet. Any extension wiring will increase the circuit resistance.
Good advice. A dogbone at the end of your existing power cord would be the easiest setup for a 20 amp circuit.
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Old 07-31-2016, 09:59 AM   #37
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Old 07-31-2016, 10:00 AM   #38
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Old 07-31-2016, 10:01 AM   #39
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Old 07-31-2016, 10:01 AM   #40
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...we have a 3 year old, brand new but never used yet Yamaha 2000 watt generator. I would like to take that along on some campouts, and would like to see if it can run the AC.
The Yamaha 2000 will most likely run the AC. Reace and others have successfully tested running the AC with the Honda 2000 of similar capacity. But, that'll be affected by altitude. Go higher and it may not be up to the task. Also, you will probably be able to run the AC and not much else except a light or two. If you want to reliably run the AC and have enough power in reserve to run other things, that means a 3000 watt generator.
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