Good Sam Club Open Roads Forum: Tech Issues: Generator and an EMS
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rvnutts

Hampton, Arkansas

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Posted: 06/19/21 12:15pm Link  |  Quote  |  Print  |  Notify Moderator

Hi all, we are new to dry camping. We have a Progressive Industries EMS. When i plugged the EMS into the generator, it would not power the rig. However, it did power the rig without the EMS. Note: the EMS threw up a PE code, open ground. I guess my question is, no EMS with a generator? Thanks!


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jdc1

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Posted: 06/19/21 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

Is it an inverter generator?

rvnutts

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Posted: 06/19/21 12:48pm Link  |  Quote  |  Print  |  Notify Moderator

Its a portable onan 3700. Maybe the EMS is not needed on the portable generator??? We always use it when plugging into shore power.

enblethen

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Posted: 06/19/21 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like the neutral and ground are not bonded. There needs to be a direct connection between neutral and ground.
Get a male 15/20 cord body. Install a jumper between the ground and neutral pins. Plug it into a receptacle.


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IAMICHABOD

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Posted: 06/19/21 01:56pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Sounds like the neutral and ground are not bonded. There needs to be a direct connection between neutral and ground.
Get a male 15/20 cord body. Install a jumper between the ground and neutral pins. Plug it into a receptacle.


A plug Like this one will solve your problem and make your EMS work properly.

Many inverter generators are not grounded,my Generac is, so no need for this plug.


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pianotuna

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Posted: 06/19/21 03:23pm Link  |  Quote  |  Print  |  Notify Moderator

EMS is not really needed with a generator.

What generator do you have?


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wa8yxm

Davison Michigan (East of Flint)

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Posted: 06/19/21 04:14pm Link  |  Quote  |  Print  |  Notify Moderator

The EMS wants to see neutral and ground bonded on the SERVICE side (park breaker panel) and most portable generators Ground is N/C since it's not needed and serves no purpose A bonding plug is easy to make

Or if you have a good Inverter Generator. Skip the Surge Guard when using the Generator. Same applies to ONAN RV generators. they self monitor and shut down if out of specs. At least mine did.


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MrWizard

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Posted: 06/19/21 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

I forget who makes the Onan portable GENERATOR (Cummins who owns Onan, has it Mfg for them, not Mfg in the Onan factory)
But the EMS should not be needed

The EMS protects against shore power outlets that are wired wrong, an open ground or neutral, utility power transient spike voltages, brown out low voltage that could damage appliances like the air conditioner or 120v fridge, etc..
Your Onan will shut down if overloaded, (does not create low voltage unless overloaded) and does not create transient spikes, won't have an open neutral or ground unless something comes loose due to vibration or damage

* This post was edited 06/19/21 07:58pm by MrWizard *


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rvnutts

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Posted: 06/19/21 07:52pm Link  |  Quote  |  Print  |  Notify Moderator

Hey thanks everyone! Ill let dh see your responses! Hopefully we will figure it out!??

bobsallyh

Livingston, TX.

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Posted: 06/20/21 11:26am Link  |  Quote  |  Print  |  Notify Moderator

rvnutts, go here. I too just added a Predator genny to our fiver, fired it up with EMS, Progressive, turned on. No power. This fixed the situation quickly.

https://www.rvtravel.com/rv-electricity-generator-neutral-bonding-basics/

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