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Old 07-19-2012, 06:22 PM   #1
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Voltage at RV park

As a new MH owner I am interested in finding out if a voltage reading of 106 volts is sufficient to run one of my airconditioners on my MH. Just had this experience at a RV park in N.Y. 30 amp service, short -30 ft. line into the motorhome and when the AC was not running my digital plug in voltage meter indicated 115v. My AC unit starts up staggering the fan first and then about 10 seconds later the compressor starts. At that point the voltage dropped to 106 volts and stabilized there. I notified the park owners and their answer was, nobody else is complaining about the power. I ran the unit the first night but luckly it got really cool and I didn't need the AC for the rest of my 4 day stay. Is 106 volts going to damage my penguin AC units? I would like to know if anyone has ay experience with kind of problem. I never run two AC units unless I am connected to a 50 amp service or I am running my APU. Thank you taking the time to comment on this..
Cal Hyatt
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Old 07-19-2012, 06:45 PM   #2
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106 AC volts in my opinion is risky. I woudn't run my coach on that low power. One of the problems I have seen, especially on 30 amp circuits, is the park recepticle gets burned because some people don't turn off the park breakers before connecting or disconnecting. The fact that your voltage drops when you add load makes me think that might be the problem. I would also suggest you purchase a surge, low voltage portector for your RV. It will save you burning up electronics because of poor park power.
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Old 07-19-2012, 06:46 PM   #3
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Well all I know is my Progressive Industries EMS-PT50C is set to cut off at 104 volts at the pedestal. It states it's set operating range is 104 volts to 132 volts.
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Old 07-19-2012, 06:49 PM   #4
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The limit for most RV ACs is 108Vac minimum. The range is 108V to 132V. Yes, you can damage the unit by running it too long at 106V or at 132V. Don't do it. Next time, ask for a different space or your money back and move on.

At the least, the RV park should have sent their handyman out to check the posts outlets because if the outlet is in bad shape due to age or abuse, it could be part of the problem of low voltage (when under load). That's because the contacts get squished by repeated usage. The plug in end of your cord needs to be clean, bright, and straight.
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Old 07-19-2012, 07:41 PM   #5
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Low Voltage Solutions / Protection

I suspect the low voltage is due to excessively long power cables running from the connection box back to the main distribution box and/or using wire that is too small in diameter for this level of load. Both are the park's problem so I agree that your only real solution is to move to a new site closer to the distribution panel or find another park. If the problem was in the plug and showing a 10 volt drop across the contacts would cause the contacts and plug to burn up. It could not sustain that much power disipation for long.

I too would suggest a low voltage protector that would drop your MH off line if the voltage gets too low....and 106 is likely too low and certainly marginal.

I had a similar problem at the last park I was at. The next day when many of the MHs left, the problem went away due to less load on the distribution cables.


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Old 07-19-2012, 08:35 PM   #6
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Most newer A/C units don't like operating below 108 volts. 106 is getting a bit low.

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Old 07-19-2012, 08:53 PM   #7
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I had a wiring fire in my previous MH caused by low voltage at the pedestal. It was winter, so I was running two ceramic fan heaters instead of the AC, but the load was probably equivalent. Since then in our current (no pun intended) MH I have installed a permanent surge protector and voltage regulator.
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Old 07-20-2012, 08:44 AM   #8
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Voltage drop is a symptom of insufficient conductors to handle the amperage load. Your AC is engineered to a specific kVa (volt-amps). When voltage is low, amps increase to compensate. High amps=heat=damage. This is common especially in older installations. If you're lucky, it won't fail straight away, but you're significantly reducing the life of its motor windings. One way to avoid this situation is to install an automatic voltage regulator inline with your service. It will protect your voltage-sensitive loads, but not the campgrounds conductors... their breakers are supposed to do that
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Old 07-20-2012, 11:47 AM   #9
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I have a VC-50 power master/booster: PowerMaster autoformers You might want to consider this or one of the other brands that available.
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Old 07-20-2012, 01:44 PM   #10
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Quote:
Originally Posted by calhyatt View Post
As a new MH owner I am interested in finding out if a voltage reading of 106 volts is sufficient to run one of my airconditioners on my MH. Just had this experience at a RV park in N.Y. 30 amp service, short -30 ft. line into the motorhome and when the AC was not running my digital plug in voltage meter indicated 115v. My AC unit starts up staggering the fan first and then about 10 seconds later the compressor starts. At that point the voltage dropped to 106 volts and stabilized there. I notified the park owners and their answer was, nobody else is complaining about the power. I ran the unit the first night but luckily it got really cool and I didn't need the AC for the rest of my 4 day stay. Is 106 volts going to damage my penguin AC units? I would like to know if anyone has ay experience with kind of problem. I never run two AC units unless I am connected to a 50 amp service or I am running my APU. Thank you taking the time to comment on this..
Cal Hyatt

Last summer, end of July, I was experiencing the same thing. The CG never tells you, but there is no way if the park is full and all the coaches are running their a/c in the 110-115 degree heat that the park power can keep up. I had to run the genny during the day.
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Old 07-20-2012, 04:29 PM   #11
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Looks like its been covered....
Mine is set to cut out at greater than 10% over/under. (108/132)
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Old 07-20-2012, 05:40 PM   #12
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plus or minus 10% is the max and minimum anything over or under will damage you electric motors ,controls and electronic's.
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