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Old 08-10-2016, 04:52 PM   #1
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Voltage Disparity

At my son's place and plugged into 15amp receptacle. MH is 30amp. A 50ft 12gauge extension to the MH to an adapter to a short dongle into the MH. Voltage at house receptacle 115, voltage at MH end of extension 115, voltage through the adapter 115v. when plugged into MH my hardwired Progressive EMS says 109volts 3amp draw (fridge and converter only items on). I then checked with a voltmeter an AC receptacle at the front of the MH (other end of the MH from the EMS) and that receptacle shows voltage at 113volts.

So the voltage into the MH is 115, the EMS says 109 but a receptacle in the MH says 113. I am scratching my head - does my EMS readout have a problem?

Will contact Progressive in the next couple of days and talk to them.
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Old 08-10-2016, 04:56 PM   #2
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So either your EMS is off or your meter is off.....I put my money on your meter....
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Old 08-10-2016, 05:14 PM   #3
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Good thought. My meter is a good quality expensive digital meter. I dont think it would be the meter.
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Old 08-10-2016, 05:21 PM   #4
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Im assuming your getting the 115 off the end of the cord with no load? A minimal drop with a load would be normal, such as the 113 your reading on an inside outlet. Open the cover on your EMS and read right from the connections and see what you have
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Old 08-10-2016, 05:44 PM   #5
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Yes the readings are no load except the hardwired ems is loaded with fridge and converter.

I forgot to mention that the house receptacle and extension/adapter readings were from my portable trc ems that i haveleft over from last motorhome. The mh receptacle reading was done with the digital meter. The hartwired ems is a progressive.

Once I did readings outside with portable ems I removed it from the feeding extension cord and adapter.
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Old 08-10-2016, 05:48 PM   #6
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in that case, too many variables to be concerned over a couple volt difference
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Old 08-10-2016, 06:01 PM   #7
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The other suggestion of taking readings right off the hardwired ems is great. Had not thought of that step.

Have to wait now a couple of days to get that done. Let you know what i find.
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Old 08-10-2016, 06:05 PM   #8
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Quote:
Originally Posted by davel1971 View Post
in that case, too many variables to be concerned over a couple volt difference

Sort of. I got started on this because the hardwired ems had dropped to 104 volts and shutdown the power. So i started taking readings. Its not much of a drop from 109 to 104.

I guess i am wondering if i might hav a faulty progressive hardwired ems.
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Old 08-10-2016, 06:15 PM   #9
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the long cord will give a drop with a load.
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Old 08-10-2016, 06:38 PM   #10
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the long cord will give a drop with a load.

True. Maybe thats my answer. Just the recetacle reading in the mh from the digital meter showed 113 while the hardwired ems was showing 109.
I guess I need to open up the hardwired ems and take readings there to get a better understanding.

Have to do this at home hooked up to my 30 amp supply and see what I get.
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