I have had my off grid setup running now for 8 years. Its 2 x Phoenix 24-3000 units running identical firmware, and operating in parallel. A few weeks ago, I finally got around to adding a Cerbo GX-S. The Cerbo is using the latest firmware (installed 2 weeks ago). Today, my inverters kept dropping out the power, and coming back on every 15 minutes or so. The only clue was a warning on VRM portal of " Phase 1 master missing on VE Bus". So, I disconnected the Cerbo from Ve Bus from my parallel inverters and the problem has stopped. Perhaps there is a bug in the Cerbo firmware. My parallel inverters have operating for 8 years trouble free, both have the latest identical firmwares.
How did you configure them to be in parallel?
How was the Cerbo included in the VE.Bus wiring of the system?
At one of the ends, or in the middle of the bus?
Could you try and reproduce the issue, but by changing that variable around, and also try replacing the ve.bus cables themselves.
The Multi’s don’t depend on the GX to stay in sync for parallel operation, but it’s possible there is some kind of new interference that has been added. That is usually in the wiring itself.
The Cerbo was connected to the “Master” inverter on the Ve.Bus. The second Ve.Bus port on the Master inverter, as per the long term
parallel connection pairing was connected to the “Slave” Inverter as it has been for years. The second Ve.Bus port on the “Slave” has nothing connected (empty).
Tomorrow I am going to troubleshoot the Ethernet cables with a network testing tool to see if there are any faults in the cable itself.
Tested the Cat5 cable with a network tool, and the cable checks out ok. Have been no problems since I disconnected the Cerbo from the inverters. Will reconnect the Cat5 cable on the Ve.Bus with the Inverter and see what happens.