deye-esp32-bridge
This PCB and Software is used to create a board which communicates with your Deye/Sunsynk inverter and also the BMS of your battery (SeplosBMS and PaceBMS are supported for now).
BOM
- PCB (designed with easyeda and produced by jlcpcb)
- AZDelivery ESP32 Dev v4
- 2x RS485 Serial Converter
- DC/DC Step Down Module
- 3x RJ45 connectors
- 12V din rail power supply
Prepare RS485 Serial Converter
Make sure that your RS485 converter is terminated by about 120R. Measure the resistance between B- and A+. Should be something between 110-130 Ohms. If you cannot measure any resistance, you need to shorten the the two small pins next to the B- connector. On my boards it was labled with R13.
Deye Setup
- Goto Advanced Function and set to Slave and Modbus SN 01
Flash ESP32
- Adapt your wifi settings in the secrets.yaml
- Connect your PC to the micro USB and run:
esphome run deye-esp32-bridge.yaml
Wiring
- Connect any 7-24V DC source to the screw headers (do not use CN2 PINS 7+8 from deye inverter, they only work for about 100mA). Make sure that JP2 is closed.
- As an alternative you can connect directly to the USB of the ESP32. Make sure that JP2 is not closed. This method makes often problems with the RS485 connection.
- Connect your inverters BMS RJ45 to the CAN IN RJ45 of the PCB.
- If you want to connect your inverter and BMS via CAN. connect your BMS to the BMS IN RJ45 of the PCB.
- Connect your Seplos BMS to RJ3
- I used RJ45 cables without shield connected to the RJ45 connector
Component Description
| Component | Function |
|---|---|
| JP1 | If closed, connects GND from Deye to GND of the BMS |
| JP2 | If closed, connects the DCDC Converter to the ESP32 |
| JP4 | If closed, connects GND from Deye to GND of the PCB |
| JP5 | If closed, connects GND from the BMS to GND of the PCB |
| U2 | Additional general purpose I/O / GND / 5V / 3V3 |
| R1 | Optional resistor, needed if connecting DS18B20 to U4 |
| RJ1 | Connects to the BMS port of Deye |
| RJ2 | Connects to the CAN Port of the BMS |
| RJ3 | Connects to the RS485 Port of the BMS |
Software
- The esphome configuration file for deye is based on the work of klatremis (https://github.com/klatremis/esphome-for-deye)
- The esphome configuration file for seplos is based on the work of syssi (https://github.com/syssi/esphome-seplos-bms)
Disclaimer
This repository contains files for demonstration purposes only. Use the files on your own risk. I am not responsible for any damage!
License
Shield: 
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
