SOLO

self.meter_uart = UART(1, baudrate=9600, tx=13, rx=14)  <--> self.panel_uart = UART(2, baudrate=9600, tx=21, rx=22)   
┌─────────┐            ┌─────────┐            ┌─────────┐              ┌─────────┐            ┌──────────┐
│  Meter  │<--- A+ --->│         │<--- TX --->│         │<----- TX --->|         |            |          |
│         │<--- B- --->│  RS485  │<--- RX --->│  ESP32  │<----- RX --->|  RS485  |<--- A+ --->| Inverter |
│         │<--- GND -->│         │<--- GND -->|         |<----- GND -->|         |<--- B- --->|          |
│         │            │         │<--- 3.3V-->|         |<----- 3.3V-->|         |<--- GND -->|          |
└─────────┘            └─────────┘            └─────────┘              └─────────┘            └──────────┘

ESPNOW

Client: self.meter_uart = UART(1, baudrate=9600, tx=13, rx=14)
┌─────────┐            ┌─────────┐            ┌─────────┐
│  Meter  │<--- A+ --->│         │<--- TX --->│         │
│         │<--- B- --->│  RS485  │<--- RX --->│  ESP32  │<---> Wifi/ESPNOW
│         │<--- GND -->│         │<--- GND -->|         |
│         │            │         │<--- 3.3V-->|         |
└─────────┘            └─────────┘            └─────────┘             

Server: self.panel_uart = UART(1, baudrate=9600, tx=13, rx=14)
┌─────────┐            ┌─────────┐            ┌─────────┐
│Inverter │<--- A+ --->│         │<--- TX --->│         │
│         │<--- B- --->│  RS485  │<--- RX --->│  ESP32  │<---> Wifi/ESPNOW
│         │<--- GND -->│         │<--- GND -->|         |
│         │            │         │<--- 3.3V-->|         |
└─────────┘            └─────────┘            └─────────┘   

Inverter:

Tested

• Solax - X1 mini any model , Gen2/Gen3
• Deye - DSUN-3.6/5/6K-SG03LP1-EU

Meter with RS485 Modbus:

• EASTRON SDM230 1P or 3P
• CHINT: 1P or 3P
• Can be any Meter with Import/Export Watt.

Board.

• STM32 F411CE 8Mflash: https://www.aliexpress.com/item/1005001456186625.html
• ESP32 any board.

RS485 modbus

UART <-> RS485: https://www.aliexpress.com/item/32705625990.html

Info

version

• solo: esp32 or stm32 - need to change UART and config.py.
• espnow: use two board esp32. One as Server, second as Client. for wireless data exchange Inverter and Meter.
  • https://micropython-glenn20.readthedocs.io/en/latest/library/espnow.html

More Details:

• syssi/esphome-solax-x1-mini#20