MitM Deye

Man In The Middle Adapter For Deye Communction Protocol

WARNING

I'm not responsible for any damaged caused by this software.

Use it at your own risk!

Idea behind it

Deye BMS does not allow setting request charge voltage, it is 58.4V always.

We intercept the message and change it to a value of our liking.

We also can change current limits without using the RS485 on inverter.

The rest of the frames are just passed on for each battery in my 2 pack array.

Features

• Modify charge current: from 0 amps to the values that BMS allows
• Modify discharge current: from 0 amps to the values that BMS allows
• Set offset to charge voltage (default 0.5V) to compensate voltage drop or fix voltage issues on some inverters, like Deye SUN12K
• Set charge limit to SoC 90% and automaticaly charge to 100% on each sunday for balancing
• Enable/Disable charging
• Enable/Disable discharging
• Control SoC 100% (don't send 100% to inverter until float voltage state is reached)

Limitations

We only modify these frames

0x351, 0x355

Requirements

- ESP32 C6
- MCP2515 if not using ESP32 C6
- CAN transceiver boards
    - 5V => TJA1050 CAN transciever boards with a 4k7Ω resistor on RX pin to ESP32
    - 3.3V => SN65HVD230 VP230 

This YAML was tested on ESP32 C6 with 2 CAN-Bus transceiver and modified ESPHome esp32_can component, to handle 2x internal CAN-busses

Tested with Deye SE-G5.1 Pro BMS and Deye SUN8K single phase inverter

Home assistant:

Plans:

• Build JK battery...
• Add JK inverter BMS into the mix:
  • 2xDeye - 200Ah
  • 1xJK200A - 280Ah (CAN/RS485)