Energy monitor

Posted May 16, 2025 21:33 UTC (Fri) by Cyberax (✭ supporter ✭, #52523)
Parent article: A kernel developer plays with Home Assistant: case studies

> There is a crucial difference here, though: the Home-Assistant integration for Refoss devices, which interfaces directly with the monitor and needs no cloud connectivity, is written and provided by Refoss itself.
> Home-Assistant compatibility is the first bullet item on the above-linked product page.

That is super-refreshing to see, thanks for the tip, I bought this device to show them support!

I'm using an Emporia monitor: https://www.emporiaenergy.com/energy-monitors/ but it required a custom firmware for fully local control. They are at least not hostile to people using their API, but in the long term it can change :(

Energy monitor

Posted May 22, 2025 12:58 UTC (Thu) by kpfleming (subscriber, #23250) [Link]

There's another option for this, which is 100% local (no cloud at all), but is more costly as a result: https://www.egauge.net/

This device doesn't just perform metering, but also data logging (for up to 10 years, in flash storage), and other functions. While the manufacturer doesn't provide or support an HA integration, they do offer a fully documented and supported API over WiFi/Ethernet, and there's a great third-party HA integration for it (https://github.com/neggert/hass-egauge).

This was particularly attractive to me as it means I configure the device to perform all the integrations, summations, etc. itself, and not 'lose' any of that data when HA is rebooted, has crashed, etc. I like using HA to gather and display the data, but not to compute the data, as it becomes a point of failure for the data computation.