DaMar42

Yes, exactly, LVGL is used in the project. There are 2x MCP2515 CAN controllers used in the PCB design. ESP32-S3 actually does not have any CAN peripheral, only "old" ESP32 does. But that one does not have hardware support for parallel LCD connection.

I am working on something similar with use of ESP32-S3. It is in early development process, but it can get data from Seplos BMSes in slave mode. Right now I am trying to emulate "master" BMS against Axpert King set in "PYL" mode. The idea is that charge/discharge voltage/current limits will be reported to the inverter by my device, not by the Seplos BMS. My expectation is that if I manage to support Pylontech protocol (V3.3) the device will be compatible with more inverters. The are also CAN ports for future developments of CAN protocols.
Basic specification of the device:
Integrated 48VDC DC-DC converter (device is powered by battery pack voltage) 4x RS485/RS232 interfaces (connection of BMSes, inverters, smart meters or other BMS master devices) 2x CANBUS interface (connection with inverters) 8x digital input (e.g. control switches, storage system enclosure tamper switches, DC contactor state switches, etc.) 4x analog inputs (e.g. auxiliary thermistors) 4x 5V output (e.g. auxiliary LED indicators) 2x relay output (e.g. for generator control) 2x bi-stable relay output (for main DC contactors) 2x 48VDC FAN output with PWM speed control and RPM monitoring (forced cooling if required) Ethernet interface (connectivity to backend cloud services and IoT platforms) Wifi interface (connectivity to backend cloud services and IoT platforms) Bluetooth LE interface (future smartphone apps possible) miniPCIe slot (optional cellular modem -2G/4G, NB-IoT, LTE-M) 7” 800x480 touchscreen 10x RGB LEDs (SoC and alarm state indication) 2x backlit panel switches (START/STOP – emergency galvanic disconnect from the load using DC contactors) USB (type A connector) for connection of mass storage devices (long term logs, etc.)