I might repeat myself but i am scratching my head and the problem is not solved.
My ESS is 3 phase, with Multiplus-II 5000 on firmware 474, Venus on 2.60. I use external control.
Sometimes one of the Multiplus units on one phase apparently decides to ignore the setpoints and starts doing odd things .. with the result being a wild ride between feed-in and consumption.
The situation resolves after some time, but that can take an hour or so. The other multiplus'es follow the instructions without issue.
this is the problematic phase only, SP is setpoint.
The overview of all 3 phases for a longer interval is here:
you can see that normally the inverter follows the instructions well ..
Any advice appreciated.