Multiplus-II inverter not switching On with VE.Bus cable to Cerbo GX Connected

DIY
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1

Multiplus-II 48/15000/200-100 230V connected via VE.Bus to Cerbo GX does not switch ON either from the Cerbo GX or the inverter switch once powered down. It can only switch ON once the VE.Bus cable is disconnected. However, it can properly switch off either from the Cerbo GX or inverter switch with Vee.Bus cable connected
Final Settings.vsc (5.8 KB)
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Once I plug back the VE.Bus cable with the inverter ON, everything works properly i.e. the Cerbo GX could display the output AC power from the inverter, correctly monitor the inverter status and correctly control turn-off the inverter.

Both the Cerbo GX and inverter are running the latest firmware. Updated their firmware versions on 19 March 2025.
What could be wrong?

2

Hi, just confirm that the GX is on 3.54 not a beta version? Thanks

3

Hello, Yes. The GX is running the version 3.54 and not beta.
venus-swu-einstein-20250128120635-v3.54

4

Thanks, and you confirmed on the GX that in the inverter tab, the soft switch was not set to OFF?
This is about the third recent post I have seen.

What batteries are you using?

Are you able to reproduce it? If so, can you try the redetect vebus system option in the GX device settings.

5

What is the actual version on the inverter

6

You are welcome.
Confirmed, the soft switch in the GX device was set to ON and it goes to OFF when the inverter is off. I have also tested that I can switch the inverter off from the GX device by toggling the soft switch but switching ON fails.

I have 6 x Dyness DL5.0C battery connected to the GX via VE Can BMS port. I have also tested without the battery VE Can BMS cable disconnected but doesn’t work.

I have also tried the redetect ve.bus system option multiple times but no luck.

7

Thanks, that helps. So is this reproducible then for you?

8

Hello, I will get you this information soonest.

9

Hello Nick,
No, it is not reproducible at the moment. I do not have another device to test it on. I am planning to visit the distributor in a few week to see if this issue exist on other devices or perhaps just this ones. I will do that and update on the findings

10

Thanks. It has been difficult to help as the issue seems to resolve after the initial install.

11

Hello LX,
The inverter is running firmware version v556 currently.