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calveryc's avatar
calveryc
Explorer
Apr 02, 2020

Charge Controller/Converter issue?

I'm new here, thanks for having me. I'm also new to RV'ing and have run into a confusing issue with a new to me RV I bought a few months ago. While hooked to a generator I noticed my box fan seemed to be running at half speed. I checked my generator and it's putting out 120v but when I checked my 110v plugs in the RV I found something odd, when I went from ground to hot I got 65V, when I go from ground to neutral I got 65V, when I go neutral to hot I get 120V. Is this typical of RVs? In a home your neutral to ground should be 0, ground to hot should be 120V. If this isn't typical is this a symptom of a bad charger controller? Anyway thanks for the help.
  • opnspaces wrote:
    Also check to see if the problem occurs at the generator itself or is it only in the trailer? What's the rated output of the generator? Is it a 2000 W model or something smaller? Is there a make and model on it?

    Are you able to plug temporarily into a household outlet and see if the readings are the same?


    It's a 3650 watts continuous Champion.
  • 3_tons's avatar
    3_tons
    Explorer III
    When trying to chase down an electrical issue (of which I can no longer recall...) I ran into this exact same 65v gremlin a couple years back, but could never interpret it’s causation... What ever the cause, I could only write it off as a phantom meter reading as it turned out to be unrelated to the primary issue (??) at that time...Wish I could remember more details, but the 65v oddity still sticks in my memory...Though to my knowledge it hasn’t raised its ugly head since, I’m still a bit perplexed by this occurrence...Now that I read about this here (a validation), there must be some combination of sinusoidal events (half wave??) that can result in this kinda reading...

    Now I have something to think about in all my new found spare time - thinking cap ON - lol!

    On edit, I now believe this reading arose when running the genny (Honda 2000), but voltage at the inline killawatt meter (genny outout) remained normal at all times...

    With the OP’s post, now I won’t rest - dang !!
  • opnspaces wrote:
    No it's not normal and potentially dangerous. What kind of RV are we talking about, a motorhome or trailer or truck camper? Is the generator built in or a portable?

    If a portable check if the shore power cord has a replacement end on it. If so unplug and disassemble the plug and make sure there are no stray wires jumping from screw to screw and allowing a voltage leak.


    Checked the cord and it doesn't have a replacement end on it.
  • Here we go with "bonded", Earthed", "grounded", "floating neutral". Get some popcorn!

    Don't know about the box fan at half speed.
  • Also check to see if the problem occurs at the generator itself or is it only in the trailer? What's the rated output of the generator? Is it a 2000 W model or something smaller? Is there a make and model on it?

    Are you able to plug temporarily into a household outlet and see if the readings are the same?
  • opnspaces wrote:
    No it's not normal and potentially dangerous. What kind of RV are we talking about, a motorhome or trailer or truck camper? Is the generator built in or a portable?

    If a portable check if the shore power cord has a replacement end on it. If so unplug and disassemble the plug and make sure there are no stray wires jumping from screw to screw and allowing a voltage leak.


    It's a Travel Trailer (R Vision Trail Lite), portable generator, Okay I'll check the cord.
  • No it's not normal and potentially dangerous. What kind of RV are we talking about, a motorhome or trailer or truck camper? Is the generator built in or a portable?

    If a portable check if the shore power cord has a replacement end on it. If so unplug and disassemble the plug and make sure there are no stray wires jumping from screw to screw and allowing a voltage leak.
  • jdc1 wrote:
    It's not grounded.
    If the camper is not grounded? Edit: So how would I check to make sure I'm getting the correct voltage to the plugs?

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