# BYD-Battery-Emulator-For-Gen24 ⚡🔋
This software converts the LEAF CAN into Modbus RTU registers understood by solar inverters that accept the BYD 11kWh HVM battery. This enables a very easy way to use EV batteries for plug'n'play storage solutions.

![alt text](https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/main/Images/Fronius.png)

## Hardware requirements 📜
This code fits on the LilyGo ESP32 T-CAN485 devboard , see https://github.com/Xinyuan-LilyGO/T-CAN485

You will also need a Nissan LEAF battery, any model year will do

Finally, you will need a hybrid solar inverter that accepts the BYD battery communication standard, for example the Fronius Gen24

## Installation basics 🪛
1. Connect one end of the LilyGo RS485 to the Gen24 Modbus
2. Connect the other end of the LilyGo to the CAN side of a LEAF battery
3. Wire up high voltage cable between the Gen24 and the LEAF battery
4. Add a 12V power source to power the LilyGo and the LEAF battery (uninterruptible PSU or 12V lead acid recommended in parallel)
5. Manually handle pre-charge circuit + positive/negative contactor on LEAF battery for now (circuit will be improved soon)
6. Enjoy a big cheap grid connected battery!

## Wiring examples 💡
Here's how to wire up the communication between the components.
![alt text](https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/main/Images/Wiring.png)

Here's how to connect the high voltage lines
![alt text](https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/main/Images/HighVoltageWiring.png)

Here's how to wire up battery low voltage wiring
![alt text](https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/main/Images/BatteryControlWiring.png)

## How to compile the software 💻
1. Download the Arduino IDE: https://www.arduino.cc/en/software
2. When the Arduino IDE has been started;
Click "File" in the upper left corner -> Preferences -> Additional Development >Board Manager URL -> Enter the URL in the input box https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
3. Go to "Boards Manager", and install the ESP32 package by Espressif Systems
4. The arduino settings should be set to "ESP32 Dev Module" with the following settings;
![alt text](https://github.com/Xinyuan-LilyGO/T-CAN485/blob/main/img/arduino_setting.png)
5. Press Verify and Upload to send the sketch to the board

## Dependencies 📖
This code uses two libraries, ESP32-Arduino-CAN (https://github.com/miwagner/ESP32-Arduino-CAN/) slightly modified for this usecase, and the eModbus library (https://github.com/eModbus/eModbus). Both these are already located in the Software folder for an easy start.

It is also based on the info found in the following excellent repositories:
- https://gitlab.com/pelle8/gen24
- https://github.com/burra/byd_battery
- https://github.com/flodorn/TeslaBMSV2

## Like this project? 💖
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