Refoss EM06P PRO Guide: Energy Monitoring and Solar Surplus Control with Home Assistant

What makes the Refoss EM06P PRO special?

Unlike its predecessor, the EM06, the PRO version introduces critical improvements for advanced smart home users:

• Local API and MQTT: Works 100% locally without relying on the cloud.
• Bidirectional energy: Distinguishes between consumed and generated energy, which is essential for solar panel installations.
• Built-in web interface: Direct configuration from your browser.
• Minute-level data: Detailed history for up to 5 years in the cloud, if you choose to use it.

1. Hardware installation

The EM06P PRO includes 6 labeled current clamps, A1, A2, B1, B2, C1 and C2, plus a power cable with three voltage reference wires: red, green and black.

Critical steps:

1. Voltage reference: Connect the three colored wires to phase and neutral. If your installation is single-phase, all three can go to the same point so the device can calculate real power in watts. Without this, the readings will be zero.
2. Current clamps: Place the clamps around the phase wires of the circuits you want to measure, such as lights, sockets, fridge or other loads.
3. DIN rail: The device is designed to fit directly into your electrical panel.

2. Initial setup and Refoss app

Before going to Home Assistant, you need to add the device to your Wi-Fi network:

1. Download the Refoss app and add the device. Bluetooth can be used for faster detection.
2. Connect it to a 2.4 GHz Wi-Fi network.
3. Update the firmware. This is essential to fix reading issues and enable the web interface.

3. Local integration: web interface and static IP

Access the device IP from your browser. From there you can:

• Assign a static IP, which is recommended so Home Assistant does not lose the connection.
• Configure MQTT if you prefer that protocol.
• View real-time consumption with a much more detailed interface than the mobile app.

4. Home Assistant integration through HACS

To unlock its full potential, we will use the custom integration available in HACS.

1. In HACS, search for and install Refoss rpc.
2. Restart Home Assistant.
3. Go to Settings > Devices & Services > Add Integration and search for “Refoss”.
4. Enter the IP address of the EM06P PRO.

You will get automatic entities for each channel: power, voltage, current and energy.

5. Automation: using solar surplus energy

If you have solar panels, the EM06P PRO can detect when you are exporting energy back to the grid. We can use that as a trigger to turn on, for example, an electric water heater.

Example YAML automation:

alias: "Solar: Use surplus energy with water heater"
description: "Turns on the water heater when there is more than 800 W of surplus solar energy"
triggers:
  - trigger: numeric_state
    entity_id: sensor.em06p_export_power
    above: 800

conditions:
  - condition: state
    entity_id: switch.electric_water_heater
    state: "off"

actions:
  - action: switch.turn_on
    target:
      entity_id: switch.electric_water_heater

  - action: telegram_bot.send_message
    data:
      chat_id: 123456789
      message: "🚀 Solar surplus detected. Turning on the water heater to save energy."

mode: single

Recommended gear

These are the devices used in this project:

• Refoss EM06P — Reviewed in the video: Official website (coupon: HHA5) · Amazon · AliExpress
• Meross EM06 — Budget option: Amazon · AliExpress

Conclusion

The Refoss EM06P PRO is the missing piece in many Home Assistant installations if you want a professional Energy Dashboard. It lets you stop guessing and start automating based on real data.