Hello, I have a specific problem with my Growatt SPH3000 BL-UP inverter and a DIY 105Ah LiFePO4 storage system equipped with a JK-BMS v19. My system is configured for zero-export (0% grid feed-in) at the grid connection point. The goal is to cover the house load first and then use 100% of the remaining PV surplus to charge the battery, ensuring that no power is fed back into the public grid.
If all systems are activated, the inverter ramps up the PV power to reach 0W at the smart meter for zero-export. Once the 0W mark is reached and the modules generate enough power to simultaneously charge the battery, the inverter tries to divert the remaining power surplus to the battery. At this exact moment, the inverter stops, goes into self-diagnosis, and restarts. It feels like the controller cannot handle balancing the zero-export regulation and the charging process simultaneously in Lithium mode.
I have observed that when I switch the battery type to Lead-Acid, the system works perfectly. Zero-export and battery charging work at the same time without any crashes. Also, in Lithium mode, the inverter has no issues covering the house load from the battery as discharging works fine. The inverter receives battery data from the JK-BMS.
I hope someone can help me with this Problem.