iem3155_esphome's Introduction

ESPHome Modbus configuration for Schneider iEM3155 Energy Meter v1.2

Revision:

v1.2 (2023-09-08)
- Further code revisions to avoid wrong initial values on reboots (not power cycles)
- Minor fixes
  - Substitutions, icons, diagnostic sensors etc.
v1.1 (2023-07-17)
- Improved documentation
- Added two additional (calculated) sensors. The daily solar power self-consumption sensor rely on daily yield value from my solar inverter via a Home Assistant sensor
  - Daily solar power self-consumption sensor
  - Daily export power sensor
- Code revised to be more resilient to reboots (not power cycles)
  - Daily export power base value is now retained in RTC memory

This repo contains my production configuration and serves as a complete ESPHome example for the iEM3155 Energy Meter.

Extremely easy, full Home Assistant integration using ESPHome as wireless Modbus node.

iEM3155 ESPHome sensors exposed to Home Assistant:

iEM3155 device configuration:

Serial: 19200, EVEN, 1 (default)
Slave address: 0x01

Note

Ensure that Com.Protection in the device is DISABLED - Com.Protection is ENABLED by default !!

Otherwise partial reset of daily energy import registers will be IGNORED by the device (id: daily_energy_import_total + 3 x daily_energy_import_lX)

ESP8266 module:

Wemos D1 Mini v3

RS485 modbus module

XY-017 'Noname' AliExpress TTL <--> RS485 module
Simple, cheap module
Supports both 3.3 and 5v
'No hazzle' module with hardware automatic flow control

The iEM3155 device also offers some additional interesting features that might be useful for others. Tariff/tariff rates and overload alarm. There's also both a digital input and output port that can be utilized as well.

Check the iEM3155 user manual/technical datasheet for further info

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