Forum Discussion

ShadySkins's avatar
ShadySkins
Explorer
Jul 11, 2018

Using a 30 amp EMS with a 50 amp coach

Is it safe to use my portable Progressive Industries EMS-PT30X (30 ammp EMS) with my 50 amp coach (using a dogbone)? We are camping at Frontier Town in Ocean City MD starting next week and will have both 30 amp and 50 amp service available. However, I would feel better using my EMS to plug into the pedestal. So... EMS into 30 amp service, dogbone adapter into EMS and finally 50 amp coach into dogbone.

I literally bought the EMS-PT30X from Amazon 33 days ago and I'm outside my return window.

Unexpectedly we upgraded from a 30 AMP TT to a 50 AMP TT this week and I still want to use my EMS. My TT is prewired for a 2nd A/C, hence the need for 50 AMP service.

Going from a 2011 KZ Spree 321BHS to a 2018 Grand Design Imagine 3170BH
Seeking Advice
  • SoundGuy's avatar
    SoundGuy
    Explorer
    Jul 11, 2018
    ShadySkins wrote:
    Is it safe to use my portable Progressive Industries EMS-PT30X (30 ammp EMS) with my 50 amp coach (using a dogbone)?


    Totally. Be aware that in another concurrent thread one forum member ran into a situation where the park has rules against plugging any rig wired with 50 amp service into a 30 amp campsite service. Have never seen this before but apparently it's happening more and more. Can't say whether you would run into any restrictions on a site offering both 30 amp & 50 amp service. I suppose a better long term solution might be to sell the 30 amp EMS you just bought and use the proceeds to buy the 50 amp version, even though it'll cost.
  • ShadySkins's avatar
    ShadySkins
    Explorer
    Jul 11, 2018
    SoundGuy wrote:


    Totally. Be aware that in another concurrent thread one forum member ran into a situation where the park has rules against plugging any rig wired with 50 amp service into a 30 amp campsite service. Have never seen this before but apparently it's happening more and more. Can't say whether you would run into any restrictions on a site offering both 30 amp & 50 amp service. I suppose a better long term solution might be to sell the 30 amp EMS you just bought and use the proceeds to buy the 50 amp version, even though it'll cost.


    Thanks for the feedback. I just recently read that entire thread :)

    In the meantime, Amazon is letting me return it outside the return window as a one time courtesy. I literally just ordered the 50 amp version.
  • pianotuna's avatar
    pianotuna
    Nomad III
    Jul 11, 2018
    Safe, yes. But you may find it quite limiting to the needs of a 50 amp power center. Why? Because 30 amps is 3600 watts, and 50 amps is 6000 watts on two legs (12,000 watts in total).

    I'd suggest you try to sell the 30 amp--and upgrade to a 50 amp.

    The weird part is that for 50 amp a good EMS is much more important. A loose or poor neutral connection can fry one leg of your RV in short order.

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