The problem started ca 2 weeks before. I got alarms in the morning "low current" and when charging the batterie from ca 80% "high current". Here is the normal loading-curve which i hat for the last 3 years.
I went for 4 days to friends and swiched my current users to the grid and let the solar system just idleing. After coming home i swiched the grid off and the solar system worked again. Next day i saw an total different loading-curve and hat alarms of an "internal failure"
without changing the current usage the batterie is deloading now to ca 40% . Alarms at ca 49.3 v "low current failure" and from ca 52 v "high current failure"
I changed the master-BMS with no better results.
I can remember that i updated then whole system ca 2-3 weeks before.
This is my system configuration
