ESPHome - Aurora Inverter Monitor

This project aims the integration between Power-One (ABB) Aurora Inverters and ESPHome using an ESP8266/ESP32 board.

The communication runs over the RS485 interface of the Inverter using a TTL-to-RS485 moudule. The module is attached to the ESP board using the pins declared in InverterMonitor.h:

#define RX 14               //GPIO14
#define TX 27               //GPIO27
#define TX_CONTROL_GPIO 26  //GPIO26

The Aurora Communication Protocol used in the communication is handled by the jrbenito/ABBAurora library.

ESPHome Sensors

This Inverter Monitor exploits the communication library to expose some of the available inverter's data:

Sensor name	Unit of measurement	Accuracy decimals
v_in_1	V	2
v_in_2	V	2
i_in_1	A	2
i_in_2	A	2
power_in_1	W	0
power_in_2	W	0
power_in_total	W	0
power_peak_today	W	0
power_peak_max	W	0
inverter_temp	°C	2
booster_temp	°C	2
cumulated_energy_today	Wh	0
cumulated_energy_week	Wh	0
cumulated_energy_month	Wh	0
cumulated_energy_year	Wh	0
cumulated_energy_total	Wh	0

NOTE: power_in_total is the sum of power_in_1 and power_in_2 values.

More sensors can be created based on the DSP_VALUE_TYPE enum values.

An additional text_sensor named connection_status is exposed to monitor the connection between the ESP and the inverter.

Building and Flashing

The full guide of the esphome ccommand line interface can be found in the ESPHome documentation.

Installing ESPhome cli

pip3 install esphome

Generating and compiling the source code

esphome config.yaml compile

Uploading the binary to the ESP device

esphome config.yaml upload