lumapu/ahoy

Various tools, examples, and documentation for communicating with Hoymiles microinverters observed · 2026-08-28

github.com/lumapu/ahoy · homepage · C++ · NOASSERTION (other) observed · 2026-08-28

Health v2 · maintenance only

42/100

Activity 36
Release rhythm 18
Longevity 100

Flags: no_license

How is this computed?

round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.

gap_med: 156
age_days: 1629
days_rel: 386
days_push: 386
n_releases_24m: 2

Full methodology

Adoption not part of the score

1012 stars · 237 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

AhoyDTU is open-source firmware for ESP32/ESP8266 that communicates with Hoymiles microinverters via radio (NRF24/CMT2300A), providing a local web interface, MQTT, and REST/JSON APIs to read live solar data and set parameters like power limits. It acts as a cloud-free replacement for the vendor DTU and integrates with smart home systems like Home Assistant and ioBroker.

Use cases

monitor my Hoymiles solar microinverter without the cloud
read real-time power, current, and daily energy from HM/HMS/HMT inverters
set a power limit on my inverter for zero export to the grid
integrate solar inverter data into Home Assistant via MQTT
visualize PV production in Grafana or InfluxDB
build my own DIY DTU for Hoymiles inverters with an ESP32
troubleshoot individual solar panels by monitoring per-input voltage and current

When to choose

you have a supported Hoymiles MI, HM, HMS, or HMT microinverter and want local, cloud-free monitoring
you want MQTT/REST integration into an existing smart home setup
you need inverter control such as dynamic power limiting for zero export
you want per-panel diagnostics to optimize panel orientation or detect shading

When to avoid

you have an HMS-xxxxW WiFi inverter with an integrated DTU, which is not supported
you need a commercially licensed solution - the project is CC BY-NC-SA (non-commercial)
you need a certified, plug-and-play commercial DTU product rather than DIY firmware on your own ESP hardware

Facets

application · maturity active

monitoring web-framework iot embedded iot energy self-hosted hardware iot embedded self-hosted hoymiles microinverter solar pv-monitoring dtu nrf24 cmt2300a zero-export firmware smart-home-integration mqtt automation esp8266

4 sources

readme: https://github.com/lumapu/ahoy · fetched 2026-08-28 · 8d1435a1dade
homepage: https://ahoydtu.de · fetched 2026-08-29 · c5b2d1a7780f
site_page: https://ahoydtu.de/web_install · fetched 2026-08-29 · 79d1c04886a6
site_page: https://ahoydtu.de/faq · fetched 2026-08-29 · 3e0f273ea658

Member repositories

Repository	Role	Health v2
lumapu/ahoy	main	42

For agents

markdown · JSON · MCP: product_card(name="lumapu/ahoy")

Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem