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OpenDTU-OnBattery

OpenDTU-OnBattery is a fork of OpenDTU, which adds support for battery chargers, battery management systems (BMS), and power meters on a single ESP32. Its Dynamic Power Limiter can adjust the inverter's power production to the actual houshold consumption. In this way, it is possible to implement a zero export policy.

Documentation

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 releases.

Project State

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!

Project History

The original OpenDTU project was started from a discussion on Mikrocontroller.net. The original ambition was 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 controller, 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.

In early October 2024, the project moved to the newly founded GitHub organisation hoylabs and is since maintained by multiple community members.

Acknowledgments

  • Special thanks to Thomas Basler (@tbnobody), the author of the upstream project, for his continued effort!
  • Thanks to @helgeerbe for starting OpenDTU-OnBattery, for his dedication to the project, as well as for his trust in the current maintainers of the project, which act as part of the hoylabs GitHub organisation.
  • We like to thank all contributors. With your ideas and enhancements, you have made OpenDTU-OnBattery much more than @helgeerbe originally had in mind.