mutliplus-II grounding question , static system

[theimportanceofbeing]

hi all quick question


I'm looking at grounding my victron multiplus 2 , 3000/48 model

Static off grid, 4kw of solar with on an mppt , 15kwh gel batteries . LPG(propane) generator for back up. Ground rod installed near system (25 foot away).

The plant is to run 1.5mm² or 2.5mm² earth cable from ground rod to the multiplus case ground lug (#F on this diagram)






Is that all correct ? am I missing anything

Help much appreciated

 

[theimportanceofbeing]

Bump

 

[mactech]

I just installed mine. Electrician said yes.

 

[740GLE]

How are you connecting your AC loads to the multiplus?

 

[hwy17]

You should have a main AC breaker panel and that's where neutral and ground are bonded and where the ground rod is connected. Inverter gets grounded to the main panel.

 

[theimportanceofbeing]

How are you connecting your AC loads to the multiplus?

Consumer unit box , with RCD , breakers , earth bar

You should have a main AC breaker panel and that's where neutral and ground are bonded and where the ground rod is connected. Inverter gets grounded to the main panel.

I'm not sure about neutral ground bond or how it's done here in the UK ? I don't think our consumer units have a neutral ground bond

 

[Pierre]

I would suggest at least 6mm2 for all grounding cables.

 

[timselectric]

Consumer unit box , with RCD , breakers , earth bar



I'm not sure about neutral ground bond or how it's done here in the UK ? I don't think our consumer units have a neutral ground bond

The utility does it for you.
If off grid, you do it.
The Multiplus may do it for you. (Check the settings)

 

[Adam De Lay]

All the PE/Ground connection points are bonded together inside the inverter. If your breaker box already has a ground inside it, when you connect that to your MP2, it should be grounded as well.

If your breaker box has a g/n bond already, you'll need to disable the "ground relay" in the MP2. By default that relay is enabled.

 

[timselectric]

If your breaker box has a g/n bond already, you'll need to disable the "ground relay" in the MP2

In the UK they rely on the grid to provide the N/G bond.

If your breaker box has a g/n bond already, you'll need to disable the "ground relay" in the MP2

It wouldn't, being a consumer unit.

By default that relay is enabled.

Perfect
(but, still should confirm)

 

[theimportanceofbeing]

The utility does it for you.
If off grid, you do it.
The Multiplus may do it for you. (Check the settings)

Victron manual confirms neutral ground bond when in inverter mode , unbonded when AC is incoming

Thank you for your answers much appreciated

In the UK they rely on the grid to provide the N/G bond.


It wouldn't, being a consumer unit.

Perfect
(but, still should confirm)

that's true in town but out here in the rural parts of UK we have what's called TT system , each house has it's own ground rod and I think the ground is kept completely separate from the neutral

Understanding Earthing and Bonding in the UK: An Essential Guide

This guide explains the importance of earthing and bonding systems in the UK, and how they must be maintained for safety. Read on for an overview of the different types of systems available and their benefits.

noticed.uk

 

[theimportanceofbeing]

So to confirm, wire the earth cable to the earth pole.... lol

 

[timselectric]

that's true in town but out here in the rural parts of UK we have what's called TT system , each house has it's own ground rod and I think the ground is kept completely separate from the neutral

In a TT system, the RCD is even more important. Because it's the only protection against electrical shock hazzard.

 

[theimportanceofbeing]

I would suggest at least 6mm2 for all grounding cables.

Ok will do thank you

In a TT system, the RCD is even more important. Because it's the only protection against electrical shock hazzard.

That and a healthy dose of common sense !

 

[timselectric]

Electrical safety systems are designed to protect the people who don't have common sense. lol