this post was submitted on 02 Nov 2026
30 points (100.0% liked)

homeassistant

21121 readers
54 users here now

Home Assistant is open source home automation that puts local control and privacy first.
Powered by a worldwide community of tinkerers and DIY enthusiasts.

Home Assistant can be self-installed on ProxMox, Raspberry Pi, or even purchased pre-installed: Home Assistant: Installation

Discussion of Home-Assistant adjacent topics is absolutely fine, within reason.
If you're not sure, DM @GreatAlbatross@feddit.uk

founded 3 years ago
MODERATORS
GreatAlbatross@feddit.uk
greatalbatross@lemmy.world
30
How to monitor 240v ac (US) power use? (lemmy.world)
submitted 1 day ago* (last edited 1 day ago) by AA5B@lemmy.world to c/homeassistant@lemmy.world
14 comments fedilink hide all child comments
 

Can anyone point to resources, reviews or experiences on monitoring power usage in 240v ac (US)?

Looking at the new energy dashboard features …. I have opower integration of my electricity usage and a nice graph. However most of my power usage is from a heat pump, and EV charger, and maybe a garage heater. All are 240v, larger current loads. So the new feature is something about graphing device usage with overall usage. So that would be cool to add

I started searching online and it doesn’t seem especially positive. I see a few clamp meters with integrations but also see reviews that they’re not very accurate.

you are viewing a single comment's thread
view the rest of the comments
[–] AA5B@lemmy.world 1 points 6 hours ago

I saw reviews where the clamps measured as much as 40% high. If my heat pump is 75% of my usage and it read that high, then when I look as a percentage of total use, it will be over 100% and my “untracked” usage will be invisible

I agree it’s expensive, but the emporia one someone else mentioned has more meters on one device. I do have smart switches which directly measure power consumption so lights are covered. I know there are outlets so I could probably cover things like a freezer if I wanted to. But there’s really only a handful of devices which use noticeable power