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kaplan78 avatar image

"Ground Relay" setting, on or off?

Hello, I have a Multiplus 2000/12/80. The Ground Relay setting is on by default. Based on my reading it looks like I should turn it off. I don't have a ground relay wire hooked up and I didn't buy an autotransformer. All I have hooked up to my multiplus is the battery, chassis ground, shore power, AC, and battery temperature cable. Am I missing anything or should this be turned off? Would having it turned on have caused any issues?


Thanks for the help!

RelayGrounding
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"Would having it turned on have caused any issues?"

Yes - if you don't have an RCD installed, you have risk of life with a single insulation fault in your installation.

6 Answers
markus avatar image
markus answered ·

Hi, this is an important setting, if you have an RCD involved in your installation or not. If you have no RCD it is better to turn it off in my opinion, to have an isolated IT network, when running on inverter power.

But please, if you are not sure, involve an electrician for your own (and others) safety and read: wiring-unlimited

Regards,

Markus

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Thanks for the info, based on what I'm reading I should turn it off since I'm not using RCD. However, since I'm using GFCI outlets it may still be useful since RCD and GFCI are both a type of circuit breaker which shuts off electric power when it senses an imbalance between the outgoing and incoming current. Does this make sense?

I would love to find a local electrician to assist, but they seem to be hard to come by for vehicle house battery systems. Any suggestions on where to find one would be much appreciated. I'm comfortable with all my settings and configurations except for this one.

In my region GFCI breaker sockets are not available, so I have no personal experience with it. I would strongly advise to ask a professional installer, how they should be implemented. It is also a matter of local laws and regulations. Ask a Victron Distributor in your location or R/V and caravan servicing companies. They usually have electricians with knowledge of local laws and regulations.

Thanks Markus, I'm reaching out to a few local van builders to see if I can pay one of their electricians to look over my setup. I'll reach out to a Victron Distributor as well, thanks for the advice and information!

Good idea! You are welcome!

I’m having similar issues finding an electrician who wants to wire up a off grid solar inverter. If they do solar, they want me to buy equipment from them. If they don’t do solar, they don’t want to mess with solar.


what setting did you go with? I plan on using gfci outlets as well.

wkirby avatar image
wkirby answered ·

This is a very important setting and is specific to your installation, specific to the type of earth system that your installation uses - there are a few.
You shouldn't need to ask about this setting. It should be absolutely clear to you.
If you are unclear then please, please consult your electrician. It's very important.

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marekp avatar image
marekp answered ·

RCD and GFCI have the same function.

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jmarc avatar image
jmarc answered ·

Ve Config Inverter page only says "Ground Relay". Help mention it allows to Enable or Disable the function. But it Does not specify if the Tick mark is to Enable (I would assume) or Disable the function. But when it comes to safety Assuming is not a real option.

Can someone confirm if. I would suggest to up date the help to make it clearer.


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Hi @Jmarc@aeandmengineering.com,

checkbox ticked = ground relay enabled

checkbox unticked = ground relay disabled

I will forward your suggestion to name this option a bit better to the devs.

Regards,

Markus

Okay I am not using any rcd breakers and my old system the gfci’s worked and all I did was put the two multis between incoming power via shore or generator and the motorhome main AC panel. I currently have them configured in Split phase one inverter feeding each leg of the AC panel and I have the ground relay shut off on the slave inverter but enabled on the master per another users recommendation. Is this correct. If it worked before would any of that change and is the gfci’s a good way to test if I disable it

kaplan78 avatar image
kaplan78 answered ·

Yeah I'm not using RCD breakers. I have a Paneltronics panel (one 30 Amp main, with three 15 Amp breakers). Then off each 15 amp breaker I have a GFCI outlet for additional protection.

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Murray van Graan avatar image
Murray van Graan answered ·

Hi @Kaplan78. Leaving it on should be perfectly fine, it connects the inverter neutral to chassis ground. If you don’t have an RCD tripping, leave it on

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No, please not. See my answer above.