Mastodawn

Something in my house is sucking a *lot* of energy and I would like to find it and make it stop doing that. Anyone have specific recommendations for multi-circuit power-usage-tracking devices? (I have 13 240V and 18 120V circuits across three panels, suggesting I will probably need three such devices; the most populated panel has 10 120V and 2 240V.)

Other requirements: ideally #homeassistant compatible, not internet based (currently have devices on zwave and non-internet-facing wifi, adding zigbee soon for unrelated reasons), works with normal US split phase power. Assume I am a reasonably competent electrician and am comfortable putting a current transformer around a wire.

#homeautomation

Show thread

Delta Sierra Oct 27

@emily I highly recommend https://www.egauge.net/

Handles a mix of 120/240V circuits (30 120V or 15 240V or a mix of those; you can even set up logic for a single CT on a 240V load if you don't mind a loss of accuracy). Integrated data logger and webserver, no cloud nonsense required. Data output via Modbus TCP/RTU, CSV, and I think the JSON API is available now too. Second-granular data for the most recent ten minutes; minute-granular for a year after that, 15-min for 30yr after that.

You can even import data from Modbus TCP/RTU devices, or from one meter into another meter.

I have one on my house and one on my garage/apartment. You can see the data here if you'd like: https://celestial-bastion.egaug.es/

I also have a bunch of environmental sensors and other measurements (THD, L1-L2 voltage imbalance, line frequency) but you have to click the dropdown in the top left corner of the graph to see that data.

Full disclosure, I also worked for them from about 2013 to 2022.

Energy Metering Systems | eGauge

eGauge home and commercial energy meters connect electricity usage and solar production to the internet for users to monitor in real time. Certified high accuracy (ANSI C12.20 0.5 percent).

Show thread

emily, blinkenlight witch

@notthatdelta oh this is nice. probably not cost effective considering I need three of them, but I'm glad someone made it.

Show thread

Delta Sierra Oct 27

@emily Yeah they are quite expensive, but the price/feature ratio is unmatched. There's even some limited oscilliscope functionality in there!

If all three of your panels are on the same service, you can get a voltage reference from one panel and extend CT leads to the other two panels. And it's totally possible to bundle loads in a single CT if you're running up against the port cap (assuming you don't mind "mixing" two loads together in your readings).