this post was submitted on 02 Nov 2026
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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
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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.

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[–] dmtalon@infosec.pub 3 points 1 day ago* (last edited 1 day ago)

The CT clamp reads the current without having to be directly connected to the wire. It just 'clamps' onto the leg and is non invasive. https://en.wikipedia.org/wiki/Current_clamp

Here's one of my panels with the clamps on. The top clamps read total power, the individual clamps below are reading one leg each. for a 240v you need both since each leg is only supplying 120. My dryer also sometimes only uses 120v when it's not actively heating.