question

You mention a potential “faulty update”, so the obvious question… did you update something, or is your GX device set for Automatic updates?

The first thing I would do would be to turn OFF the whole system, disconnect the PV, then disconnect the MPPT from the battery for a minute or two. Then reconnect (starting with MPPT battery) and power up again. Effectively a complete reboot. You may have done this?

Check for any connections that may have come loose during the powered down period.

If that fails then you could check the GX firmware update (if it was done automatically? ) you have an option to roll back to the previous loaded firmware?

1. Yes it is set to auto update.
2. I have no PV, just batteries and shore power as displayed in the pictures
3. I have turned off the entire system several times, for hours, I always turn off the whole system when I leave the boat.
4. I have checked all connections, and checked if there is power on the systems, I did that again this morning, it also shows in the pictures that everything is connected, only the charger does not turn on.
5. How do I roll back to a previous version?
6. Is there any way to turn on the charger manually?
7. What about "Active AC Input: Disconnected", is this how it should be? Because it says disconnected and at the same time underneath that (see pic1) it says 233V 50Hz, that does not make sense to me.

As a workaround I connected the charger that came with the batteries today and it started charging right away, as expected, same grid power. So why a 150 euro charger can charge my batteries and a 2000+ euro system can't is a big mystery to me.

Use the rocker switch at bottom of Multiplus to switch to charger only.

I did this already, this is displayed in pic3 and pic4 of my 1st post

On the console go to Settings >Firmware then click on Stored backup firmware, there you can boot from the previous version

Ok, I will go and try that now, thanks!

Autoupdate was set to Check only. I think it's on on the smart shunt. Updated it to latest version, but it still does not work. I will try again tomorrow, otherwise return it and buy something more simple.

Have you previously updated the MP2 firmware? This sounds like a configuration issue to me. Are you connected to VRM or have a MK3 adapter? Check your settings on the charger tab.

A couple of thoughts.

First, to eliminate the "quality" of the AC In (shore power), have you tried other AC In sources? (distortion of input waveform can be a reason for the Multiplus to reject even if the Voltage and freq are within limits) This is something that may have changed without you being aware?
If you go to the Devices page on the console and look at the Multiplus line... what charge mode does it "think it is in"...?
Thirdly has the Smart Shunt been Synchronised manually ? (there are references in the manual)

Either the AC In is unacceptable or, the "system" thinks that the battery is fully charged, even though the SOC and battery voltage shown suggest it isn't? (communication problem?)
Have you checked actual voltage at the battery with a multimeter? These are only suggestions.

There could also be a hard fault... however, it is important to rule out possibilities.

Check your inverter country code settings.

The inverter might not like 50.1Hz for AC In.

The setup has worked for about a year and a half now but all of a sudden the Victron refuses to charge the batteries. [...] I haven't changed anything in the setup, so the only thing I can think of is a faulty update or the Victron broke down within 2 seasons.

You first say that this setup worked well for 1.5 years and then you say you never charged anything in this setup.

Can you explain what you mean by that?

Thanks everybody but I think I will just replace the Victron with a few simple inverters. I already have chargers and they work perfectly on this grid. Replacing those, if they ever break, will cost me 150 euro's and 10 seconds instead of 1500 euros and 4 days. I really don't want this overly complicated and frustrating stuff on my boat anymore.