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OpenDTU on Battery / Zerosolar PCB

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A housing for the OpenDTU on battery for the Zerosolar board with CMT2300A, ready for connection to the battery CAN bus.
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updated May 4, 2025

Description

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This is my personal solution for the Zerosolar CB Rev. 5 with CMT2300a that I bought for my Hoymiles inverter.

 

✅ Compatibility

  • Designed for SZ-OpenCB-V.5_0 by Nick Förster (2024)
  • Compatible with ESP32 and CMT2300a radio module
  • Intended for Hoymiles inverter integration

 

🔧 Mounting Details

  • The CAN bus connection is routed via an angled pin header, discreetly installed underneath the ESP module.
  • Exact mounting positions and details are available in the original model documentation.

 

🛠 Recommended Print Settings

  • See recommendations in the base model (OpenDTU on Battery / Zerosolar PCB)
  • Optimized for standard FDM printing
  • PETG recommended for durability

 

🌦 Use Cases

  • Designed for PV monitoring with Hoymiles inverters
  • Suitable for indoor or semi-sheltered installations
  • Integrates cleanly into existing OpenDTU setups

 

🧩 Design and Functionality

  • Compact design adapted specifically for the Zerosolar Community Board Rev. 5
  • Hidden CAN bus routing for minimal cable clutter
  • Compatible with other models from the OpenDTU/Zerosolar ecosystem
  • Please refer to the main version for full wiring and functionality details

Tags

hoymiles opendtu onbattery zerosolar polyntech

Model origin

The author remixed this model.

OpenDTU Zerosolar PCB
 by quantenquark
 

Differences of the remix compared to the original

🔀 Differences Between the Models

An RJ45 socket and a bracket for the SN65HVD230 CAN bus transceiver have been added. This upgrade enables battery readout capabilities via CAN bus.

⚠ Depending on your battery model (e.g. Polyntech, Pytes, etc.), the RJ45 pinout may vary, so be sure to check your device’s manual before connecting!

See also detailed instructions:
📖 OpenDTU-OnBattery Wiki (github.com)

 

The CAN bus is connected via a right-angle pin header neatly tucked under the ESP module. This was chosen as the most space-efficient and cleanest solution for internal wiring and ensures clear cable routing.

Sources for electronics and parts:

 

 

Update 20.12.2024:

Added more detailed photos for better insight into the enclosure

Uploaded version V12 (CAN) & V13 (CAN breakout)

License