Welcome to the DiyBatteryBMS wiki!

The DIY Battery BMS has the following features:

• Receive data from a Victron Smart Shunt (different models supported) in the Victron Text Protocol

• Send Charge Voltage
• Send Charge Current
• Send Battery Voltage
• Send Battery Current
• Battery charge request flags Currently a fake Battery Temperature is sent, this will be changed in the future.

• UI for monitoring and configuration changes of all parameters.
• MQTT sending of data in JSON format
• Reduce charge current by SOC
• Smart adjust charge current reducing as full voltage is hit, allowing balancing time
• Force Charge by Inverter for Off Peak Charging (triggered via MQTT)
• Adjustable Charge Voltage and Current
• OTA Updates
• LCD Display 20x4

Recommended hardware:

esp32dev (https://www.amazon.co.uk/gp/product/B0C9THDPXP/)

esp32plus (https://www.amazon.co.uk/dp/B0BHZ8H6LM)

Lilygo CAN485 (https://www.aliexpress.com/item/1005003624034092.html) - use ESP32-ESPCAN build.

LCD (https://www.amazon.co.uk/dp/B07V5K3ZVB) - not tested with Lilygo CAN485 board

Isolated CAN Bus Adapter (https://www.amazon.co.uk/Coolwell-Isolated-Expansion-Raspberry-SN65HVD230/dp/B0C7VX6G6P)

Non-Isolated Adapter - Does work and cheaper but can be blown if not careful. (https://www.amazon.co.uk/AZDelivery-MCP2515-Receiver-Development-Compatible/dp/B086TXSFD8/)

Victron Smart Shunt (https://www.amazon.co.uk/Victron-Energy-SmartShunt-Battery-Bluetooth/dp/B0856PHNLX)

For detailed installation please see the Install wiki page!

• Follow the install page
• Follow How to Wire the CAN Bus Adapter Page
• Follow How to Can to Inverter Connection Page
• Connect the Victron Device to ESP using the How to Connect to Victron Shunt Page
• Power up your ESP Device
• Connect to the Access Point it creates and configure it to connect to your network - http://diy-batterybms.local or http://192.168.4.1
• Connect again http://diy-batterybms.local, configure the options as per your setup, go through each page - BMS / Settings.
• Get a beer, your done :)