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Old 09-11-2020, 10:16 AM   #1
Greyghost
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Shore power

Howdy folks, We are currently in Tucson Az. and when we arrived I plugged in my new EMS-PT50X for protection. Well we've been here 6 weeks and the first 3 or 4 weeks no issues. So lately we been having the power to the rv turn off then back on. The unusual thing is that this occurs in the evening. Spoke to the manager and he has an electrician looking into it. When the post gets to 133v it shuts down? My question is do these surge protectors give you EXTRA protection? By that I mean does one volt make that much difference? I'm not an electrician btw, and we haven't used this protector until we arrived in Tucson. In addition, the manager says no one else has made a similar complaint, he has a Momentum with the on board protector and has no problems. We have a 3791rd btw, thanks.
 
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Old 09-11-2020, 10:44 AM   #2
jcurtis934
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Yes, the electrical management systems provide protection over not having one. An electric heater or fireplace may not be sensitive to over/under voltage, but electronics, fridges, etc are. Most tv's don't have a management system and even those that do may be on another transformer than you. Your experience may just be crappy utility service regulation to the park or part of it.
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Old 09-11-2020, 10:51 AM   #3
Carl n Susan
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Most folks think an EMS protects against low voltage. But over voltage can also be an issue. 132 is the upper limit and the EMS did its job.
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Old 09-11-2020, 01:13 PM   #4
Greyghost
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Understanding the ems function, I guess I'll have to wait until 3pm when the electrician arrives. My frustration is from 10 pm until 9am I have no power, and it's getting old quick! The funny thing is we came from Myrtle beach(2 months) and never had an issue, no ems used. Lucky I guess? Thanks for the imput.
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Old 09-11-2020, 01:36 PM   #5
BB_TX
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Utility companies are required to supply power of 120 vac +/- 5%. That is 114 to 126 vac. So that power is well beyond what it should be. Apparently demand during the day is pulling it down. But as evening approaches and demand decreases the level is rising too much.

Still sometimes called 110 or 115 vac, those are old voltage levels before 120 was decided on as the standard voltage level.
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Old 09-11-2020, 01:57 PM   #6
mhs4771
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Here's the spec right from the manual for your unit:

High/Low Voltage Protection: The EMS continuously monitors AC power When AC
power deviates below 104 volts, for more than six (6) seconds, or rises above 132
volts, the EMS automatically shuts down power to the RV. Once the AC power rises
above 104 volts or drops below 132 volts, the 2 minute 16 second (136 seconds)
time delay counts down and power is restored automatically.

So it's working exactly like it should.
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Old 09-11-2020, 04:23 PM   #7
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Since you didn't use the EMS at your previous campground you don't know if they had power issues or not. In our experience, over 10 years of full time, most campgrounds don't but those that do don't want to fix them. Where we've found issues and made them give us a different spot we've come back the next year and the same spot still had the same problem such as an open ground even though they knew about it the year before.
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Old 09-11-2020, 09:47 PM   #8
sourdough
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^^^^^This seems to me to be the way it is. Some parks have flaky power. They probably know it and if I experience it (due to EMS) I bring it to their attention. Most say "Oh really, we'll check it" but they don't. If it's an overnite stay we deal with it unless we lose power completely, make notes in our travel folder and don't come back. If we came in for a longer stay I push the issue; I've moves sites a few times and left a few times.

I think the power problem will continue to deteriorate in parks unless owners upgrade their systems. What used to be fine - everyone had 30A, park never full etc. has now morphed into full parks and everyone trying to come in with a 50A rig. Time will tell
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