Earth on inverters

[DavidCh]

I will start by apologising, I know this has been done dozens of times but I just want someone to cross check me

I have a victron 12/800. I have moved the internal jumper so earth is connected to neutral.

Inverter goes to an A type RCBO and then to the normally closed connections of a 3 pole relay with L N and E switched individually. The output of the relay takes L and N to a double pole 10a circuit breaker and then to the sockets. Earth output goes to the common earth of the electrical system and is bonded to the chassis.

EHU earth is also connected to the relay and, when energised connects the EHU earth to the common earth. L and N go through a surge suppressor and then to a A type RCBO then go to a bank of circuit breakers (all double pole) for the charger, fridge etc; and also to the relay to energise it. One of these circuit breakers go to the normally open connections on the relay to supply power to the sockets.

This way I am protected if the EHU trips but I am still connected to their common earth.

I think this is correct but a cross check would be great.

 

[Raul]

Sounds ok to me, as long as your combined earth neutral bond is isolated from ehu supplied earth. When you on ehu, you use supplied earth, when ehu is disconnected, unplugged, you are using your own earth derived from you neutral bond. Usually when ehu present that bond is disconnected via relay, and when ehu disappears the bond is closed back. Hope this makes sense. The idea is to not have two paths to earth. The bond it’s only made once, at the supply.

 

[DavidCh]

Thanks, that is what I understood, I just wanted someone else to check my reasoning. It is incredibly difficult to get a clear answer. I will say I know a heck of a lot more about earthing and grounding than I did before. On the boat it was easy, fit a 3kw isolating transformer and stop worrying but the 24kg of weight put me off in the Motorhome . Can I ask your opinion on grounding, should I ground the sink and gas hob into the PE.

 

[Raul]

Thanks, that is what I understood, I just wanted someone else to check my reasoning. It is incredibly difficult to get a clear answer. I will say I know a heck of a lot more about earthing and grounding than I did before. On the boat it was easy, fit a 3kw isolating transformer and stop worrying but the 24kg of weight put me off in the Motorhome . Can I ask your opinion on grounding, should I ground the sink and gas hob into the PE.

I’m not sure about the sink, but anything like cooker boiler needs bonding. Pretty sure will be a connection to bond the PE. Mine has, including gas heater, all bonded.

 

[DavidCh]

Many thanks. It’s a complicated subject

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