The Feed-in excess solarcharger power setting is also activ in the external control mode. I can set it to disabled in the menue Optimized (with BatteryLive) and then switch back to external control this works as long as i reset the device. After that feed-in is again activ. Also i watched that the power settings are sporadicly changed so it seems that other program parts are still activ in external mode and disturb the external control loop. As I understood in the external mode i have the control except BMS limitations. So maybe I am wrong or there are some bugs in the software.