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Old 05-19-2017, 12:42 PM   #11
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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?
I've used my EMS-PT50C Portable Surge Protector - 50 Amp reduced to thirty with no problems.
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Old 05-19-2017, 01:45 PM   #12
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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?
A 50 amp EMS works with 30 amp service.
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Old 05-19-2017, 01:54 PM   #13
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Yes I have a 50-30 dog bone reducer. I plug into 30 Amp side then plug the 50Amp Ems into the other end which is a 50 plug then plug my campers 50 into the EMS. Works fine.
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Old 05-19-2017, 01:54 PM   #14
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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.
The owners are very nice. I'll take a sumber with no A/C before I would have given the last campground another nickle. I'm not removing the EMS. The extension cord was my doing. I had it at home and when my friend parked my 5er for me, I hadn't checked the power cord for length. If I move my RV forward I can hook up to all utilities. I suspect my cord is only 25 feet. It's what came with the RV from the dealer. What I don't understand is why they are building new areas without 50 amp service. I suspect they would have to rewire everything coming from the street.
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Old 05-19-2017, 02:17 PM   #15
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Extra sets of contacts and small gauge wire will cause voltage drop. You purchased the system to protect your expensive AC units and it is working as intended. Clean the contacts, reduce the number of connections if possible. Get a voltmeter and measure voltage at the camp source with your AC running. If that is too low then ask the camp owner to fix the problem or refund your money. If you bypass the EMS and run your AC all summer it will fail later at your expense.
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Old 05-19-2017, 05:03 PM   #16
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what will help is to get 50 amp extension cords and only use the 30 amp reducer on the shortest run possible...

If you are in the dfw area I have 3 or 4 that I would let go cheap --> here some

check locally on craigslist etc...
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Old 05-19-2017, 10:06 PM   #17
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Yes I have a 50-30 dog bone reducer. I plug into 30 Amp side then plug the 50Amp Ems into the other end which is a 50 plug then plug my campers 50 into the EMS. Works fine.
I do the same thing also and have had no issues so far.
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Old 05-20-2017, 05:12 PM   #18
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I was able to take out the 30 amp extension cord and the 50 amp cord reaches with no slack. I ran the A/C for about 20 minutes and it was fine. I think taking the cord out of the equation is probably what I needed to do.

I need to pull my camper forward about 3 feet and I'll be fine. I'm going to ask one of the work campers to move my 5th wheel for me. I'll have it ready, all they have to do is back in and move it forward about 3 feet. The campground is building a new area that has more space and less pines. If I can't get one of those spots I probably won't come back.
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Old 05-20-2017, 07:16 PM   #19
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good deal !
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Old 05-21-2017, 04:46 PM   #20
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compressor

Background in refrigeration, degree in electronics, and worked for an ice machine manufacturer. Compressors are typically rated for +/- 15%. So at 107 volts you should not have any problems starting 1 compressor. The extension cord will cause voltage drop. I've worked in and around old hospital ER rooms that had old and long voltage runs. I've seen compressors start at a lot lower voltage.
Remember ohms law. As voltage decreases, amperage increases. As voltage decreases, resistance also increases.
The good news is that compressors have either an internal or external bi-metal overload.
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