• OpenDTU-OnBattery
  • What is OpenDTU-OnBattery
  • Documentation
  • State of the project
  • History of the project
  • Acknowledgment

This is a fork of OpenDTU.

OpenDTU-OnBattery is an extension of the original OpenDTU to support battery chargers, battery management systems (BMS) and power meters on a single ESP32. With the help of a Dynamic Power Limiter, the power production can be adjusted to the actual consumption. In this way, it is possible to implement a zero export policy.

The canonical documentation of OpenDTU-OnBattery is hosted at https://opendtu-onbattery.net.

You may find additional helpful information in the project's community-maintained Github Wiki.

To find out what's new or improved have a look at the changelog of the releases.

OpenDTU-OnBattery is actively maintained. Please note that OpenDTU-OnBattery may change significantly during its development. Bug reports, comments, feature requests and pull requests are welcome!

The original OpenDTU project was started from a discussion on Mikrocontroller.net. It was the goal to replace the original Hoymiles DTU (Telemetry Gateway) to avoid using Hoymile's cloud. With a lot of reverse engineering the Hoymiles protocol was decrypted and analyzed.

In the summer of 2022 @helgeerbe bought a Victron MPPT charge cntroller, and didn't like the idea to set up a separate ESP32 to receive the charger's data. He decided to fork OpenDTU and extend it with battery charger support and a Dynamic Power Limiter.

A special Thank to Thomas Basler (tbnobody) the author of the original OpenDTU project. You are doing a great job!

@helgeerbe: Last but not least, I would like to thank all the contributors. With your ideas and enhancements, you have made OpenDTU-OnBattery much more than I originally had in mind.