{"product_id":"opendtu-esp32-diy-kit-hoymiles-nrf24l01-display-monitor","title":"OpenDTU ESP32 DIY Kit for Hoymiles – NRF24L01 \u0026 Display","description":"\n\u003ch2\u003eOpenDTU ESP32 DIY Monitoring Kit for Hoymiles Microinverters\u003c\/h2\u003e\n\u003cp\u003eBuild your own solar microinverter monitoring station with this complete \u003cstrong\u003eOpenDTU DIY Kit\u003c\/strong\u003e. Powered by the high-performance \u003cstrong\u003eESP32 microcontroller\u003c\/strong\u003e and paired with the robust \u003cstrong\u003eNRF24L01+ wireless module\u003c\/strong\u003e, 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose This OpenDTU Kit?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Performance ESP32 Core:\u003c\/strong\u003e The ESP32 delivers significantly faster processing than the older ESP8266, ensuring smooth, responsive data handling and reliable wireless communication.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNRF24L01+ Wireless Module Included:\u003c\/strong\u003e Features the upgraded NRF24L01+ with integrated antenna for a stronger, more stable RF connection to your Hoymiles inverter.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Hoymiles Inverter Compatibility:\u003c\/strong\u003e Works seamlessly with HM300, HM350, HM400, HM600, HM700, HM800, HM1200, HM1500, TSun 350, TSun 400, and TSun M800 models.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete Kit – Ready to Build:\u003c\/strong\u003e Everything arrives in one package — ESP321 board, NRF24L01 module, connecting cable, and display. No hunting for missing parts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMetal Construction:\u003c\/strong\u003e The antenna socket hardware is built from metal for durability and reliable signal connectivity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIY \u0026amp; Maker Friendly:\u003c\/strong\u003e Ideal for home solar hobbyists, electronics enthusiasts, and open-source energy monitoring projects using OpenDTU firmware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eESP321 OpenDTU Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMicrocontroller\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eESP32\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWireless Module\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNRF24L01+ with Integrated Antenna\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetal (antenna socket hardware)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Inverters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHM300, HM350, HM400, HM600, HM700, HM800, HM1200, HM1500, TSun 350, TSun 400, TSun M800\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × ESP321 Microcontroller Board\u003c\/li\u003e\n  \u003cli\u003e1 × NRF24L01+ Wireless Module\u003c\/li\u003e\n  \u003cli\u003e1 × Connecting Cable\u003c\/li\u003e\n  \u003cli\u003e1 × Display Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/038-inch-1280x720p-micro-display-diy-hdmi-driver-board-kit\"\u003e0.38\" 1280x720P Micro Display DIY Kit with HDMI Driver Board\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLearn More About Solar Energy Monitoring\u003c\/h3\u003e\n\u003cp\u003eInterested in how solar energy systems work and the importance of monitoring your output? Visit \u003ca href=\"https:\/\/www.energy.gov\/eere\/solar\/homeowner-s-guide-going-solar\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eEnergy.gov's Homeowner's Guide to Going Solar\u003c\/a\u003e for authoritative guidance on home solar setups and best practices.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Color may vary slightly from images due to monitor brightness and lighting conditions. Please allow minor measurement tolerances.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which Hoymiles inverter models is this OpenDTU ESP32 kit compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need to supply any additional components to get this DTU kit working?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Why is the ESP32 better than the ESP8266 for this OpenDTU build?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is OpenDTU and how does it work with Hoymiles inverters?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which Hoymiles inverter models is this OpenDTU ESP32 kit compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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. 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