EDECOA ED-BW_COMM V3.1 ESPHome Firmware

Replace the original cloud firmware of the EDECOA ED-BW_COMM V3.1 (ESP32-C3) with ESPHome and integrate your EM624A inverter directly into Home Assistant.

---

Features

• ESPHome firmware for the original ED-BW_COMM V3.1
• Local communication (no cloud required)
• Native Home Assistant integration
• OTA firmware updates
• Real-time inverter values
• Voltronic / PIP protocol support
• UART debugging

---

Tested Hardware

Device	Status
ED-BW_COMM V3.1	✅
ESP32-C3	✅
EDECOA EM624A 6.2 kW / 48 V	✅
ESPHome	✅
Home Assistant	✅

---

Hardware

Original EDECOA ED-BW_COMM V3.1 WiFi module.

Rear side of the PCB.

---

UART Configuration

Confirmed working configuration:

Parameter	Value
TX	GPIO4
RX	GPIO5
Baud Rate	2400
Data Bits	8
Parity	None
Stop Bits	1

No hardware modifications are required.

The original ED-BW module can be flashed directly using its USB interface.

---

System Architecture

                Home Assistant
                       ▲
                       │ API
                       │
                 ESPHome Firmware
                       ▲
                       │
             ED-BW_COMM V3.1 (ESP32-C3)
                       │
                 RS232 / PIP Protocol
                       │
                 EDECOA EM624A

---

ESPHome Web Interface

Live monitoring of the inverter directly from the ESPHome web interface.

Features include:

• Live sensor values
• UART debug log
• OTA updates
• Web server diagnostics

---

Energy Control Center Example

The firmware is also used as part of a custom ESPHome based Energy Control Center.

Integrated systems include:

• EDECOA EM624A
• JK-BMS
• Victron SmartSolar
• Hoymiles HMS-2000
• Zendure Hub
• go-e Charger

---

Installation

1. Backup the original firmware

python -m esptool -p COM7 read-flash 0x000000 0x800000 backup.bin

---

2. Copy

esphome/edecoa-edbw.yaml

into your ESPHome configuration directory.

---

3. Configure secrets.yaml

wifi_ssid: "YOUR_WIFI"
wifi_password: "YOUR_PASSWORD"
fallback_password: "CHANGE_ME"

---

4. Flash via USB

The initial installation must be performed over USB.

Subsequent firmware updates can be installed over Wi-Fi using OTA.

---

Repository Structure

docs/
    images/

esphome/

home-assistant/

tools/
    uart-finder/

---

Troubleshooting

If no inverter data is received:

• Verify TX = GPIO4
• Verify RX = GPIO5
• Confirm 2400 baud
• Disable serial logger (baud_rate: 0)
• Check the RJ45 cable wiring

---

Disclaimer

This project is not affiliated with EDECOA.

Flashing custom firmware replaces the original firmware.

Always create a firmware backup before flashing.

Use at your own risk.

---

Contributing

Contributions, bug reports and pull requests are welcome.

If you test another inverter model, please include:

• inverter model
• ESPHome version
• board revision
• UART logs

---

License

MIT License