I have a similar issue, currently on 46, with SMA SI’s … has been an issue for a couple years where the SI believes the signal from the batrium drops and at best it simply trips the relay connection, at worse it restarts the whole inverter and and very worst it turns the inverter off completely.
I have monitored CAN traffic while it was happening a couple times and it appears the batrium is sending signals when the SI believes it is not. The logs clearly show the SI stating the SOC is out of range or it has lost the BMS signal while the batrium is sending the right SOC or a signal in general.
I have sought out help from other DIYer’s and documented some of the information on other forums but haven’t reached out here yet. Batrium SMA Sunny Island Integration issue? | Page 2 | DIY Solar Power Forum