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Old 05-18-2017, 03:56 PM   #1
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Question EMS works?

So the good news is the 50 Amp EMS works. Bad news, first hot day and the EMS keeps shutting down the A/C. Error code reads PE06 which is low voltage. I installed the EMS because the campground we are at only has 30 amp service and the campground owner assured me that it would be fine as long as we only ran 1 of the 2 A/C units and watched concurrent use of other high voltage items.

I tried both A/C units seperately, the 15K and 13,500 K in the bedroom, same result from both. I'm really extra concerned because it's mid week and the park is empty, hardly anyone pulling power.

Before I go talk to the campground owner, I have a question. The power box on my site was further than my cord would reach. I have the 50 amp cord plugged into a dog bone dropping it to 30, then plugged into a 30 amp extension cord. It's a heavy duty RV extension cord. Will the extra cord cause the voltage drop? After I installed the EMS at home, I tested it out with the same configuration plugged into a 110 outlet and the A/C ran fine. We are on a dirt road, every vehicle has to pass us to leave. We figured the one saving grace from the dirt and dust inside was going to be running the A/C to keep the windows shut and dust out. My wife is not going to be happy.
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Old 05-18-2017, 04:36 PM   #2
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Maybe the polarity at the post is reversed?

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Old 05-18-2017, 04:44 PM   #3
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The extra extension cord could very well cause the voltage drop, especially if it is hot outside. You can measure the voltage with the A/C running if you have a voltmeter.
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Old 05-18-2017, 06:17 PM   #4
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The EMS has a digital read out. The polarity is fine, shows E0 which is no fault. The PE06 L2 104 means the EMS cut power to the RV because the voltage dropped to 104 on leg 2. Voltage of less than 107 can damage A/C compressor. I just walked around and most of the people here are running A/C. I was hoping to avoid having to pull all the blocks and move the 5th wheel 5 feet forward to plug it in. Either way, I only have 30 amp, that is all they have in the park.
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Old 05-18-2017, 06:27 PM   #5
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I would move to another site and try it there. May be a pain to move but I'd be afraid to stay at that site. Could be the extension cord. If you don't try another site I would be moving on anyway. Not worth burning out an AC.
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Old 05-18-2017, 06:50 PM   #6
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the ems is a money saver !
I stayed at a park the 'maintenance man' said the pole was fine, just take you ems off, I said no thanks - will leave this site or this park before I do...
Your voltage drop is because of the resistance of the extra length cords, BUT why go to a 30 amp site in the first place ? use your 50 !

1 AC won't keep us cool ever
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Old 05-18-2017, 07:21 PM   #7
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There are no other sites. If I pull out, there is no refund. I'm not throwing away $2,500. This is our first 50 amp 2 a/x RV. We lived with one a/c for years and even no a/c. In New England finding a seasonal rental is not easy. They all have good and bad. They all want a down payment and deposit around Labor Day. This was our second choice. Our first choice was where we have friends. We walked away from a beautiful site in a nice park after 13 years and were prepared not to camp this summer. The owners were rude and greedy. They went up $100 a year and added nothing. We will make this work for this summer. I guess I will try moving it forward first.
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Old 05-18-2017, 07:52 PM   #8
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Well what ever you do I wouldn't remove the EMS. It's doing exactly what it's designed for; to protect your unit. It's your choice but if they can't provide service that's not going to ruin your unit, that doesn't say much for that campground. In the future (as you've learned) don't stay somewhere where you have to use an extension cord. I would ask for the owner. That's crazy.
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Old 05-18-2017, 08:11 PM   #9
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You could try one of these to boost the voltage.
https://hughesautoformers.com/
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Old 05-19-2017, 10:07 AM   #10
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Could it be that the EMS is a 4 pole 50 amp plug that is plugged into a 3 pole 30 amp reducer and it is not seeing enough voltage across both lugs?
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