Hi everyone,
Back in October I shared EnergyMe-Home here for the first time, my open-source, fully local 16-channel smart energy meter based on the ESP32-S3. The response from this community and people around the world gave me the boost to push this project past the hobby stage.
There are now 40+ units running in homes across 12+ countries (and others are joining soon, such as the USA or Ireland). The board is now at revision 6.1, which went through a full final revision, being now galvanically isolated while still retaining the compactness (3 modules DIN) and the 16 channels.
So far, I showed twice at Maker Faire Rome (2024 and 2025), and I'll be at Open Sauce in San Francisco in July too, so if you're around, come say hi!
Best way to get a feel for it: there's a live demo simulating a device one to one → demo-energyme-home.energyme.net.
Why it fits HA: local and private (no cloud or subscription needed, ~10 years of hourly history stored on-device with no SD card), simple HACS REST API integration (available here) with no MQTT broker required (just IP/energyme.local + login and sensors flow, though MQTT, Modbus and InfluxDB are there if you want them), and ~200ms updates on the main channel for real load-based automations.
Some useful infos:
- Accuracy: 1% or less vs utility meter when properly calibrated.
- Three-phase: works by deriving the other phases and assigning each channel a phase in the UI; split-phase is also supported.
- CTs: any clamp with a 3.5mm jack under ±500mV; I now also sell matched 30/75/150A ones.
Full disclosure: I'm the creator, and you can now buy it, but it stays fully open-source (hardware + firmware, OSHWA IT000025), and you can build the whole thing from the repo if you prefer.
Everything (demo, docs, shop) is at energyme.net, also on Tindie, shipping worldwide from Milan. Repo and hardware files: GitHub.
Thanks again to everyone supporting this in the beginning, and let's hope to further expand the community to develop the best and most accessible smart energy meter ever!
