I have 3 Multiplus-II 48/3000 with 8 Pylontech US2000C installed and everything works fine, except when the battery is nearly full and the heating rod is switched on to use the excessive pv power. In that case the ESS is getting confused and is ignoring the grid set point exporting power to the grid unnecessarily.
The grid set point of the heater is -200W and the grid set point of the ESS is 0W. As you can see in the picture the Multiplus stops charging and starts inverting although there is power fed to the grid.
The pylontech batteries can be charged also.
The heater is adapting its power every 2.5 sec so in my opinion the Multiplus should have enough time to regulate its power.
Has anyone an idea what I can do to get the desired behavior?