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Topic: Difference in digital readout panels on Xantrex and Progressive Industries EMS (Read 1109 times) previous topic - next topic

Difference in digital readout panels on Xantrex and Progressive Industries EMS

While I don't think we have a problem, I find this situation perplexing.

We have a Xantrex ProSine 3.0 and a Progressive Industries EMS-HW50C.

Only in the evenings do I see this happen.  Right now the Xantrex display panel shows incoming voltage for Line 1 - 140V.  Line 2 - 139V.

The readout panel for the Progressive Industries EMS reads Line 1 - 125V.  Line 2 - 125V

Does any one know why this happens?
George Stoltz.  Retired from full-time living in a great Foretravel and now are back to living in a traditional sticks and bricks in Florida.

Re: Difference in digital readout panels on Xantrex and Progressive Industries EMS

Reply #1
We don't have a Progressive EMS for comparison, but when we have had unusually high voltage readings on our built-in coach monitoring panel (we have the Xantrex 2500, IIRC), the problem has been either a poor ground connection in the campground or another unit on the same leg/circuit of the campground which had a wiring problem, polluting the ground.  When this happened, our Surge Guard indicated a "voltage on ground" error. 

We've also seen a flickering red LED on the built-in coach readout when this occurred.

Voltage is a funny thing - it's actually a difference measurement, not an absolute one.  So 125V is 125 volts above what the reference is (which should be 0 on ground).  Once can still have 125V difference between a voltage leg and "ground", yet if there's a phantom voltage on "ground", either because the connection isn't good (ground is "floating") or there's a miswired rig on the leg, then a unit which "assumes" 0 voltage on ground will display a higher reading.

So let's say there's a phantom 15 volts on Ground.  The voltage leg would be 120-125 volts above that, but a readout which assumed Ground was 0 would actually display 135-140 Volts.

In your case, if possible I would check on moving to a different site that's possibly on a different electrical circuit/leg unless the problem suddenly showed up with a particular rig's arrival (we had this happen).  It's a small but possible safety concern.

Michelle

Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

Lifetime Escapees' member SKP 82766
Former 1999 30IB Lazy Daze (2000-2004)
Former 2003 U320 (2004-2016)
Former 2017 LTV Unity (2017-2023)
Shopping for our next coach

Re: Difference in digital readout panels on Xantrex and Progressive Industries EMS

Reply #2
George....  I have noticed the same difference.  I have one of the portable EMS units and it normally reads lower, voltage-wise, than the Xantrax unit in our 2003 U295.  I think it is a Prosine 3.0.  Normally I check the voltage before I plug in with another voltmeter, but I don't recall which is closer (EMS or Xantrex) to the voltmeter.  Note that I see this difference without any obvious problems as shown by my RV circuit checker (see previous posts) or the EMS unit.

George
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

I Made a Mistake in the Basic Premise of This Topic. I Am Truly Sorry

Reply #3
What I reported as a difference in the read out between the EMS digital readout and the Xantrex panel was incorrectly described.

Here is my error.  I was looking at the 10-year-old and original "Power Line Monitor" bearing the Foretravel name and logo.  It is this device that is giving erroneous information. 

When using a voltmeter (thanks, George Hatfield) and comparing it to the Progressive Industries EMS digital readout,  I am within one volt between the two.  I will be more careful in future postings. 

 :(How long do I have to sit in the corner? :-[
George Stoltz.  Retired from full-time living in a great Foretravel and now are back to living in a traditional sticks and bricks in Florida.

Re: Difference in digital readout panels on Xantrex and Progressive Industries EMS

Reply #4
George.....  I made the same mistake.  The Xantrex panel does not have the line voltage readings.  It is the panel next to it (Power line monitor, Foretravel).

George
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

Re: Difference in digital readout panels on Xantrex and Progressive Industries EMS

Reply #5
I was moments away from calling Xantrex and asking for warranty service, but decided to take one more close look at the panel and discovered my mistake.  A real "DUH!" moment.  It is comforting to know that I have company.

George Stoltz.  Retired from full-time living in a great Foretravel and now are back to living in a traditional sticks and bricks in Florida.