ESPHome Inverter Monitor

A project to monitor inverters through ESPHome in Home Assistant, providing real-time data monitoring.

Prerequisites

• Home Assistant with ESPHome installed
• ESP32 (DOIT DevKit V1)
• UART connection to inverter (TX: GPIO17, RX: GPIO16)

Features

• Real-time monitoring of inverter parameters:

  • Input/Output voltage and frequency
  • Battery voltage and charging current
  • Power metrics (apparent, active, power factor)
  • Temperature and load percentage
  • System status and operation mode

• Connectivity:

  • WiFi connectivity with fallback AP mode
  • Home Assistant API integration
  • OTA (Over-The-Air) updates support

Optional Features

• Two relay outputs for external control (GPIO22, GPIO18)
• Status LED (GPIO2)

Installation

1. In Home Assistant, go to ESPHome dashboard
2. Click on "+ NEW DEVICE"
3. Select your ESP32
4. Copy the provided YAML file content
5. Update WiFi credentials in your secrets.yaml
6. Install the firmware to your device

Basic Configuration

substitutions:
  name1: "inverter"
  friendly_name: "Inverter"
  tx_pin: GPIO17
  rx_pin: GPIO16

WiFi Setup

Add to your ESPHome's secrets.yaml:

wifi_ssid: "your_ssid"
wifi_password: "your_password"
fallback_password: "fallback_password"

Relay Configuration (Optional)

If you want to add relay control, add these substitutions:

substitutions:
  sw1_pin: GPIO22 #Relay1
  sw2_pin: GPIO18 #Relay2

Communication Protocol

The device communicates with the inverter using UART with the following specifications:

• Baud rate: 2400
• Data bits: 8
• Parity: None
• Stop bits: 1
• Buffer size: 256 bytes

Sensors

The project includes various sensor types:

• Text sensors for status information and version
• Binary sensors for system status and operation modes
• Numeric sensors for all measured values (voltage, current, power, etc.)

Troubleshooting

• Check device logs in ESPHome dashboard
• Verify UART connections and baud rate
• Ensure proper WiFi credentials in secrets.yaml
• Monitor the "Last Response" sensor for raw communication data

Contributing

Feel free to report issues and propose improvements.

License

This project is open source. Feel free to use and modify as needed.