I have a small ESS system consisting of
1.6Kwp of PV via 2 MPPT 100/20 controlers
Multiplus II 48 3000
BMV 702
I keep having issues with the SOC jumping to 100% too early resulting in the SOC becoming inaccurate, the batteries discharging too much then cutting off and sustain kicking in. Looking at the VRM data I can see that when I charged the batteries fully with the multi the SOC jumps to 100% even though the tail current hadn't dropped below the setting in the BMV. The BMV is selected on the venus device as the chosen battery monitor.
Pictures below include the graphs and BMV settings. My understanding of the maths behind it is that the current needs to be less than (124 * 0.04) = 4.96A as well as voltage over 52.8V and 3 mins of both values being true.
Is there something simple I am missing?