Pace BMS Integration for Home Assistant

A Home Assistant integration for Pace Battery Management Systems (BMS) via Modbus RTU over serial connection.

Features

• 📊 Real-time Monitoring

  • Pack voltage, current, and state of charge (SOC)
  • Individual cell voltages (up to 8 cells)
  • Multiple temperature sensors (cell, MOSFET, environment)
  • Remaining and full capacity
  • Cycle count and state of health (SOH)

• ⚡ Binary Sensors

  • Charging/Discharging status
  • MOSFET states
  • Dynamic icons based on state

• 🔧 Configurable Protection Parameters

  • Overvoltage/Undervoltage protection (pack and cell level)
  • Overcurrent protection (charging and discharging)
  • Temperature protection (charging, discharging, MOSFET, environment)
  • Balance settings
  • All parameters adjustable via Home Assistant UI

• 🛡️ Status Monitoring

  • Warning flags
  • Protection flags
  • Fault status
  • Cell balancing status

Requirements

• Home Assistant 2023.1 or newer
• Pace BMS connected via USB-to-RS485 or direct serial connection
• Modbus RTU communication configured on BMS

Installation

HACS (Recommended)

1. Make sure HACS is installed
2. Add this repository as a custom repository in HACS:
   • Open HACS
   • Click on "Integrations"
   • Click the three dots in the top right corner
   • Select "Custom repositories"
   • Add https://github.com/OwlBawl/Pace-BMS as repository
   • Select "Integration" as category
   • Click "Add"
3. Click "Install" on the Pace BMS integration
4. Restart Home Assistant

Manual Installation

1. Download the latest release from the releases page
2. Extract the Pace-BMS folder to your custom_components directory
3. Restart Home Assistant

Configuration

Adding the Integration

1. Go to Settings → Devices & Services
2. Click + Add Integration
3. Search for "Pace BMS"
4. Enter the configuration:
   • Name: Friendly name for your BMS (default: "Pace BMS")
   • Port: Serial port (e.g., /dev/ttyUSB0, /dev/ttyACM0)
   • Baudrate: Communication speed (default: 9600)
   • Slave ID: Modbus slave address (default: 1)

Finding Your Serial Port

Home Assistant OS -> Settings -> Hardware - All Hardware

Lovelace card example inculuded (change you device name prefix in entities)