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A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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In terms of raw data, any properly calibrated equipment should be identical.
You could build one yourself or have a look at how to get readings from your actual electricity meter. Both can be found on the open energy monitor project page. If you self build i guess you could use a lower value CT that amplifies lower currents and just not use it at higher loads?
Mains power fluctuates a LOT though so youll definitely need averaging to some extent
Many residential tools can’t even be calibrated. Even if they are, calibration stability is a concern. The difference between a cheap instrument and a good one is short and long term repeatability.
Thanks for pointing open energy monitor, that seems overkill for what I need.