I installed a Multiplus-II 48/5000/70-50 with a unit of 4kW BYD battery. The system worked for 6 days without any issue. Then the system started triggering' Ground relay test failed ' . Then that error completely disappeared and the system started triggering internal error and low battery alarm. I have rechecked the wiring and the system several times, But I have not found any mistakes within my settings.
NOTE: I have installed several Victron and BYD systems, and this is the first time I am encountering such issue.
Thanks for helping.