How to fix battery charging issues with Cerbo GX

DIY
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The battery should be charging. But I think the Cerbo GX doesn’t use the same formula as VRM.

I have a Solax with an ET112 meter configured as a PV inverter on the AC-IN, and I don’t have an external meter on the MP-II. I understand that it should be doing the maths (as VRM is doing).

Is this a bug, or should I add another meter for the AC-IN?

I’ve enabled remote support in case you’d like to take a look. The VRM ID is 949269 (I’m not sure if I should post it)

2

Do you have a grid meter before the PV inverter with the ET as well?

Even the vrm has it wrong it has put the pv inverter after the victron which is not its position on the GX.

So this is the set up? If you dont have a grid meter the inverter will try to use its physical terminal input measuring with will not be grid input figures. So the ‘calculation’ will be very incorrect, because it has no idea about whether their are ac loads now before the inverter.

flowchart LR
    GRID["🔌 Grid"]
    PVINV["☀️ PV Inverter"]
    ETMETER["📊 ET Meter"]
    JCT((" "))
    VINV["⚡ Victron Inverter"]
    ACLOADS["🏠 AC Loads"]

    GRID -->|"AC In"| JCT
    PVINV --> ETMETER -->|"AC coupled"| JCT
    JCT -->|"AC In"| VINV
    VINV -->|"AC Out"| ACLOADS