Thank you for explanation ! And yes that is exactly how i expect it to work . But for me MSOCL is 20%. And in a screenshot i have sent you it was still using solar only to charge battery and loads were still fed by Grid. And it was wayy above minimal SOC. It started to supply energy to loads only after battery reached 100% (exactly) . Then MPPT had to throttle down because battery was full and loads were not as high as Solar production. Which is lost energy that could have been used instead of cycling battery.
It is kind of visible on this graph. You can see smooth raise in SOC and also battery current .