emonHP - Heat Pump Monitoring

As of Aug 2026 emonHP V2 hardware is not yet released

Introduction

emonHP V2 is a system for monitoring heat pump operation. It is designed to work with OpenEnergyMonitor, but can be used as a standalone system.

The system provides the following interfaces:

• MBUS
• RS485
• Level, pulse, and OneWire inputs
• USB-C
• 40-pin Raspberry Pi header

Getting started

Getting a board

• Purchase a heat pump monitoring system from the OpenEnergyMonitor Shop
• Build your own!
  • With KiCad installed, run ./generate.py in the pcb directory (tested on Linux and macOS only) to generate manufacturing files (KiCad PCB, Gerbers, BoM).

emonHP

Note

Setting up as an integrated emonHP system requires a Raspberry Pi 4 or 5. These expose extra UART ports on the 40-pin header which are not available on older versions.

Connect the Raspberry Pi to the 40 pin header.

Warning

Power must only be applied to one of the emonHP's USB-C port or the Raspberry Pi's power port, never both.