Excellent technical support
My Growatt SPH-10000TL3-BH got instable after a custom integration where it did not accept MODBUS commands and locked up from time to time. Even though I bought the inverter 3 years ago, Growatt Technical Support helped me by remotely upgrading the firmware after which my problems were solved. I would like to specifically thank Yicheng Zang from Growatt Netherlands for helping me. Due to his help I can now control charging and discharging remotely through Homeassistant. Much appreciated!