question

@RL78

Have you looked at the VE bus error manual?

Error #8.

With an error like this I would start checking wiring, particularly the ground neutral since they are tied. Or if somewhere someone has mixed a L and N.

From all information I see on-line, the AC 2 output is for non-essential loads and is only active when the grid is connected (not inverting). AC 1 output is the main output and is active while inverting. AC 1 output use the one I believe you should be using for your emergency power loads.

I don't know for sure this is the cause of your error but I'd switch the loads to the AC 1 outputs for proper/expected operation and see of that clears the fault.

@Kevin Windrem

Sorry my fault, Output AC1 is of course used.

@ Alexandra

Yes I did read the error codes in the VE manual.

Error 8 is failed grounding relay test. In This case it looks like the unit is expecting an open connection, but detects a connection N to PE.

There is no connection between N an PE wired.

I did some tests tonight. It seems that I can connect the multi L2 and L3 neutrals without fail. After the Relay test I conneceted the N from L1 Multi also.

Till now it is working. I'll verify this next evening again.

Is it possiple that the Multi (GX) L1 is an older HW version ?

It seems to me like a timing problem when grounding relay test. (Multi L1 testing for no conn and one of the others coses the connection for testing...)

Any idea how to get rid of this problem ?

Does anyone know how, when and how often the grounding relay tets is done ?

Can I disable it in ESS german settings (Int NA protection setting) and use an external relay?

Good night for now, and thanks for your thoughts so far

Ralf

Does the neutral star point on the output possibly have a path back to the input neutral?

You said that star point does not have a connection to PE but have you checked that with a meter? Maybe a connection in the load distribution panel you do not know about?

I wonder if only the ground relay in the L1 unit is active in a 3-phase system which is why you get the fault only when the L1 neutral is connected to the Multi.

I don't think the GX device would have anything to do with this fault or the ground relay test. But you could disconnect it and try powering the system without it.

What happens if you make one of the other units the master?

Just guesses.

Hello Kevin,

I checked with a meter, but since the star point is connecterd in a neu distributer with no (not yet) loads and cabels installed there is no chance for a connection to a connection between N and PE.

It's just bars for PE an N with no connection to each other and some MCB and RCD for the loads. So far no loads are installed. I wantetd the system to be stable at first.

I think the problem my come that for example Multi L2 connects N to PE for thest, and Multi L1 tests for N to PE open...

Therefore i think its a timing problem.

GX disconnecting is ab bit tricky, I have to open the Multi L1 to do so.

I dont think that ESS can be operated without a GX ( the Grid meter is pluged here) but maybe an charger...

Same problem I see here is making an other multi the master. Isn't the master automatically the one with the GX ?

I do not have a Problem when I have Isolated the Neutrals from each other.

Therefore I an thinking timing overlap or something like this.

Thanks for you thoughts

Ralf

Hi there,

I did some trying and meassuring...

Via VE Configure I can't disable the ground relay.

Via Victron connect and MK3 connection I can, and I did.

I did some testig, it appears that if you disable the groundig Relay via Victron connect, that only the testing is disabeld.

I disconnected the AC in Phase and the AC in and AC out neutrals and could still meassure the connection from PE to N. AC out phase was disconhected via mcb.

Then I removed the PE from the in and out terminals and the connection was still there.

Same behavior at all three units.

Has anyone similar experience ?

Have a nice day,

Ralf