📄 OpenDTU Zerosolar PCB

A compact enclosure specifically designed for the OpenDTU Community Board (SZ-OpenCB-V.5_0 by Nick Förster) with pre-soldered CMT2300A module – ideal for PV monitoring setups requiring minimal space and clean wiring.

If you like this model, I’d truly appreciate a like! Your support means a lot and inspires me to keep creating and sharing more designs. 💖

✅ Compatibility

This case supports:

• OpenDTU Community Board SZ-OpenCB-V.5_0 (2024-01)
• All ESP32 variants with 0.96" or 1.3" OLED displays (different VCC/GND layouts supported via jumpers)
• Designed for the CMT2300A pre-soldered version

📌 Other radio modules for Hoymiles HM types may also work, but radio model and connection differs.

🛠 Recommended Print Settings

• Material: PETG or ASA (for UV/weather resistance)
• Infill: 25–30 %
• Layer height: 0.2 mm
• Supports: Optional – minimal needed
• Walls: 2–3 perimeters

🌦 Use Cases

• PV system monitoring via OpenDTU
• Clean indoor or protected outdoor installations
• Ideal for Hoymiles HM/HMS family

🧩 Design and Functionality

• Minimal footprint with no cable clutter
• Enclosure accepts both OLED display sizes
• Rear-mounted SMA antenna improves reception
• Jumper-configurable board support for flexible display/power pinouts
• Updated version improves PCB retention and fastening points
• Optional CAN bus transceiver upgrade available (see related model in my collection)

📋 Materials List

• 1× printed enclosure (this model)
• 1× SZ-OpenCB-V.5_0 Community Board
• 1× ESP32 dev board
• 1× 0.96" or 1.3" OLED display
• 1× CMT2300A pre-soldered (or alternative radio module)
• 1× 15 cm 868 MHz SMA antenna (3 dBi)
• 4× M2.3×8 mm screws (DIN 7981)

📦 Case Compatibility & Credits

• Designed independently due to the community site going offline
• Based on board by Nick Förster (Foerster Solutions)
• Original PCB info:
  • 💻 solarzero.org
  • 📩 [email protected]
  • 🛒 ebay shop:  https://www.ebay.de/itm/405595200167

🔗 Related Models in My Collection

If you are interested in my upgrade with CAN-BUS transeiver please find the file in my collection:

🔌 OpenDTU on Battery / Zerosolar PCB 

References:

In you are happy with the model I would appreciate you hit the Like button.