OpenDTU ESP32 DIY Kit for Hoymiles – NRF24L01 & Display

OpenDTU ESP32 DIY Monitoring Kit for Hoymiles Microinverters

Build your own solar microinverter monitoring station with this complete OpenDTU DIY Kit. Powered by the high-performance ESP32 microcontroller and paired with the robust NRF24L01+ wireless module, this plug-and-play kit gives solar enthusiasts and DIY makers everything they need to track inverter output in real time — no proprietary cloud required. Made in Mainland China.

Why Choose This OpenDTU Kit?

• High-Performance ESP32 Core: The ESP32 delivers significantly faster processing than the older ESP8266, ensuring smooth, responsive data handling and reliable wireless communication.
• NRF24L01+ Wireless Module Included: Features the upgraded NRF24L01+ with integrated antenna for a stronger, more stable RF connection to your Hoymiles inverter.
• Wide Hoymiles Inverter Compatibility: Works seamlessly with HM300, HM350, HM400, HM600, HM700, HM800, HM1200, HM1500, TSun 350, TSun 400, and TSun M800 models.
• Complete Kit – Ready to Build: Everything arrives in one package — ESP321 board, NRF24L01 module, connecting cable, and display. No hunting for missing parts.
• Metal Construction: The antenna socket hardware is built from metal for durability and reliable signal connectivity.
• DIY & Maker Friendly: Ideal for home solar hobbyists, electronics enthusiasts, and open-source energy monitoring projects using OpenDTU firmware.

Specifications

What's in the Box?

• 1 × ESP321 Microcontroller Board
• 1 × NRF24L01+ Wireless Module
• 1 × Connecting Cable
• 1 × Display Module

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Learn More About Solar Energy Monitoring

Interested in how solar energy systems work and the importance of monitoring your output? Visit Energy.gov's Homeowner's Guide to Going Solar for authoritative guidance on home solar setups and best practices.

Note: Color may vary slightly from images due to monitor brightness and lighting conditions. Please allow minor measurement tolerances.

Frequently Asked Questions

Q: Which Hoymiles inverter models is this OpenDTU ESP32 kit compatible with?

A: This OpenDTU kit is compatible with a wide range of Hoymiles microinverter models, including HM300, HM350, HM400, HM600, HM700, HM800, HM1200, HM1500, as well as TSun 350, TSun 400, and TSun M800. If your inverter is one of these models, this kit is designed to work with it out of the box.

Q: Do I need to supply any additional components to get this DTU kit working?

A: No — the kit includes the ESP321 board, NRF24L01+ wireless module, a connecting cable, and a display module. You will need to flash the open-source OpenDTU firmware onto the ESP32 board (freely available on GitHub) and have a basic understanding of DIY electronics assembly. No soldering is required for basic assembly.

Q: Why is the ESP32 better than the ESP8266 for this OpenDTU build?

A: The ESP32 offers significantly faster processing speed, dual-core architecture, and more memory compared to the ESP8266. This translates to more responsive data monitoring, better handling of wireless communication with the NRF24L01+ module, and greater stability for your solar inverter monitoring setup.

Q: What is OpenDTU and how does it work with Hoymiles inverters?

A: OpenDTU is an open-source, community-developed Data Transfer Unit (DTU) firmware that communicates directly with Hoymiles microinverters via the NRF24L01+ wireless module. It allows you to monitor your solar panel output — including power generation, voltage, and current — locally on your own network without relying on a third-party cloud service.