My system started giving an issue yesterday during peak load time (around 2.5kw load) in an island system comprised of the above Multi, an SMA PV Inverter and a Blue Nova battery. Before yesterday the system ran stable for at least 4 months continuously. (At that stage I had an issue with the Blue Nova not getting fully charged due to settings for repeat Absorption cycle - so the Multi to SMA linking worked correctly and has been for at least four years) The symptom is that the PV Inverter kicks in for around 3 seconds every about 5 minutes and is then pushed into standby mode again. The load is then supplied by the battery until it goes into protection mode ( Low Battery Light) . I checked individual cell voltages on the battery to make sure there is no hidden issue there and they were all above 3V. The same issue has happened today - I have just upgraded the firmware (2624465) and checked the PV Assistant for latest version.
The Bus Monitor shows the following:
Not in Phase
UMains (Red) 0V
Power 0 VA
IOut 8.7 A
Power 1987 VA
Freq Out 49.9 Hz
Freq In ... Hz
This shows same when the load is increased to 2.5kW
I would really appreciate some assistance to what could be at fault and how do I go about resolving the issue. Thank you...