How to Integrate IAMMETER with Home Assistant for Real-Time Energy Monitoring

Integrating IAMMETER Wi-Fi Energy Meters with Home Assistant for Enhanced Energy Monitoring Why Integrate IAMMETER with Home Assistant Integration Methods 1. MQTT Discovery (Recommended) 2. MQTT (Manual Configuration) 3. Modbus/TCP sensor 3. Native Home Assistant Integration 4. Home Assistant Community Store (HACS) Real-World Use Cases A. Solar PV System Monitoring B. Control Water Heater with Solar Surplus C. Charge EV from Solar Energy D. Smart Appliance Scheduling Summary About IAMMETER Solutions Products System

Integrating IAMMETER Wi-Fi Energy Meters with Home Assistant for Enhanced Energy Monitoring

Integrating IAMMETER Wi-Fi energy meters with Home Assistant enables real-time insights into your energy usage, solar generation, and overall power flow. This integration helps optimize energy consumption, automate smart devices, and support sustainable energy practices.

Why Integrate IAMMETER with Home Assistant

Real-time electricity monitoring
Custom energy dashboards with Lovelace UI
Automations triggered by energy events (e.g., solar surplus)
Long-term data logging for cost analysis
Flexible integration methods: MQTT, Modbus/TCP, Local API

Integration Methods

IAMMETER supports several methods for integrating with Home Assistant, based on your technical preference and desired features.

A brief comparison of the different methods is as follows:

	Mode	Interface	IAMMETER-Cloud available
1	MQTT discovery	MQTT	No
2	MQTT	MQTT	No
3	modbus/tcp	Modbus/TCP	Yes
4	core integration	HTTP GET	Yes
5	HACS	HTTP GET	Yes

1. MQTT Discovery (Recommended)

IAMMETER meters with firmware version i.76.058.8+ support Home Assistant MQTT Discovery.

Benefits:

Fully auto-discovered in Home Assistant
Minimal setup effort
Near real-time data updates

Steps:

Upgrade to latest firmware
Enable MQTT Discovery in IAMMETER web UI
Connect IAMMETER to your MQTT broker (used in Home Assistant)
Devices and sensors appear automatically

Fore more details, please refer to Enable MQTT discovery in Home Assistant

2. MQTT (Manual Configuration)

This method uses standard MQTT publishing without Home Assistant’s auto-discovery feature. It is useful for users who prefer manual control or want to customize sensor configurations in YAML.

Benefits:

Manual control over sensor naming and configuration
Works on older firmware versions that do not support discovery
Lightweight and flexible

Steps:

Enable MQTT in IAMMETER’s web interface.
Set the MQTT broker address, username, and password.
IAMMETER will publish topics like iammeter/SN/Power and iammeter/SN/Energy.
In Home Assistant, add MQTT sensors manually in configuration.yaml, for example:

Fore more details, please refer to Home assistant mqtt sensor-IAMMETER

3. Modbus/TCP sensor

Use Case: If you need data every second, Modbus/TCP is ideal.

Benefits:

Fast polling (1s interval)
Reliable industrial-grade protocol

Steps:

Enable Modbus/TCP in IAMMETER configuration
Set up modbus: integration in configuration.yaml
Define sensor: entities using register addresses

Fore more details, please refer to request the data of IAMMETER`s energy meter from modbus/tcp in Home assistant

3. Native Home Assistant Integration

IAMMETER is officially supported in Home Assistant's core integrations.

Steps:

Go to Settings > Devices & Services
Click + Add Integration > Search for "IAMMETER"
Enter meter IP address and connect

Integrate IAMMETER`s energy meter into Home assistant by Native Home Assistant Integration

4. Home Assistant Community Store (HACS)

IAMMETER also maintains a custom component for deeper customization.

Steps:

Install HACS in Home Assistant
Add IAMMETER repo from HACS
Configure YAML or use UI for setup

https://www.iammeter.com/docs/summary-home-assistant#hacs-custom_integrations

Real-World Use Cases

Here are some practical applications that IAMMETER users have implemented via Home Assistant:

A. Solar PV System Monitoring

Monitor real-time solar production, grid import/export, and household consumption.
Visualize energy flow and optimize self-consumption to reduce reliance on the grid.
Track daily, monthly, and yearly solar performance using Lovelace dashboards.

Monitor your solar PV system in Home Assistant

B. Control Water Heater with Solar Surplus

Automatically turn on the electric water heater when solar generation exceeds home consumption.
Prevents grid export and increases self-consumption.

Heat the water heater using solar surplus

C. Charge EV from Solar Energy

Use IAMMETER + Home Assistant + OCPP-compatible charger to initiate EV charging when solar export reaches a threshold.
Example: Only charge EV if export power > 3 kW for 10 minutes.

Control the EV charging power with regard to the solar PV output and grid power reading