Multiplus II 5000 GX (GX switched off for 16 hours)

Q&A and troubleshooting
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1

Dear All,

On Saturday 6 September 2025, I installed a Multiplus II GX 5000 in my PV system. I registered on the VRM Portal and set the parameters, including ESS. The inverter worked correctly for this week. This morning (13 September), I noticed that the inverter display was off, black, with no writing, and even pressing the button next to the display did not turn it back on (the AC power supply in the house was not interrupted). Looking at the router, I saw that data transmission to VRM portal had also been interrupted. Unexpectedly, in the early afternoon, the display turned back on and the inverter was connected to the VRM. At this point, I thought it was some kind of GX standby mode rather than a real fault. I asked a friend who owns a Multiplus II and he gave me two pieces of advice: 1) I set the “keep screen always on” option to ON in VictronConnect connected via Bluetooth, 2) I connected a USB key with a small LED that flashes every few seconds to the Victron USB port to increase the current consumption of the GX system. Do you think it could be a fault or did I set some parameter incorrectly that causes the GX to switch off?

Thank you for your help. As the product has just been purchased, I would like to know whether I should contact the dealer to find out if there is a fault or if everything can be managed by settings.

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2

Do you have a battery connected to the system? And the power switch in the correct position?

3

Of course, i have a 16S 280Ah Lifepo4 battery. Even during the 16 hours when the GX was switched off, there was no interruption to the AC power supply in the house, so I conclude that the inverter was working correctly and that the problem was with the GX.

4

Is there power in the batteries? How has it been wired can you share the diagram so we can see the system setup

5

My PV system has been in operation for three years and the battery is always full and working properly. I only replaced the old inverter with the new Multiplus II GX 5000 a week ago. As you can see from the VRM, there is a 16-hour gap between last night and this morning. As I wrote, the AC supply was never interrupted. So the problem is with the GX, not the inverter or the battery.

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6

One PV is supplementary not fundamental to a battery Grid based system so has no bearing on it turning on or off.
Without knowing how it’s wired and configured it’s a guessing game but you seem to have reached your hypothesis

You say you changed an inverter is it like for like?

How is the multi wired ac in ac1 out ac2 out?

What size is the PV array? AC DC? How is it wired to the multiplus.

Without going through the basics nothing can be ruled out. But that’s just my two cents

7

So, looking into my crystal ball, I would guess that the GX board had failed. Keep an eye on it and then contact the dealer if necessary.

If the internet connection is down, the data is temporarily stored until the internet is back up, so there should not have been any gaps.

I am not aware of any way to deactivate only the GX board. It’s either all on or all off.

The Multiplus GX includes the normal Multiplus and a GX device, which is why the 230V network continued to run normally.

8

I agree with everything except that some people have successfully connected an external GX and they have been advised to disable the internal GX.