This is my Setup
Yesterday, I've completly discharged my battey. Suddenly and without reason the SOC spiked to 95% and a bit later to 100% SOC.
Since then the SOC is stuck, even that the voltage is indicating that the SOC is definetly not 100% (see Screenshot below). Not only the SOC is stuck, also the activated ESS from the Multiplus doesn't charge or discharge anymore.
I was able to resolve the issue. At the end it was not related with the Multiplus or the BMS. The causing factor was a not 100% tightened screw. Before the reported error occurred, the battery was completely discharged with high current. It seems that the heavy usage charging and discharging caused to warm up the screwed connectors which caused that the screw terminals to loose the connection.
Your system is in a state known as sustain.
Check your bms has not switched off. Then set ESS to keep batteries charged until it has reached absorption again. (According to voltage)
That chart is from the internal multiplus meter so it doesn’t look like the system is configured to use your (unsupported) BMS. I would solve that problem first.
If the environment isn’t configured right, issues will follow.
