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Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io

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Questions about Zigbee, Wifi and Smart-Plug measurement accuracy (feddit.org)

submitted 1 week ago by [email protected] to c/homeassistant

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I want to dip my toes into the smart home world and decided that I want to use homeassistant and primarily use devices based on zigbee, as I do not want to overload my wifi with a bunch of devices.

Smart plugs seem to be most interesting to me as I would like to have accurate power measurements for my homelab and applicances. The keyword is accurate here. There seems to be some science showing that the accuracy of smart plugs can vary a lot. I have read that devices that are flashed with the tasmota firmware can actually be calibrated. Unfortunately this firmware is only available for wifi devices.

So my questions are:

Are there zigbee smartplugs that are known to be very accurate or can be calibrated to be very accurated?
Is preferring zigbee over wifi actually a good Idea? I mean both use 2.4 GHz, which is known to be crowded. When will wifi smart home devices become a problem?
Is a calibrated tasmota smart plug more accurated than a typical zigbee plug?
Is this inaccuracy reported in the paper even relevant for non-scientific use?

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[–] thehatfox 2 points 1 week ago

Some Zigbee smart plugs and sockets have configurable calibration settings. I have some SmartThings smart plugs that have calibration settings, and I think the new IKEA smart plugs with power monitoring have calibration settings too.

There are some resellers providing generic Wi-Fi smart plugs pre flashed with Tasmota and calibrated correctly. Not sure where you are located but in the UK I can recommend Local Bytes.

I've also seen people recommend Shelly devices for power monitoring for accuracy. The Powercalc integration developer used to recommend Shelly devices for measuring power use of new devices to create Powercalc profiles.

I wouldn't expect too much from accuracy from any of these smart devices though. They are intended for general consumer use to provide general ideas about energy use - they are not scientific instruments and probably shouldn't be treated as such.

If you are looking to monitor homelab devices specifically perhaps you should look at a more professional/enterprise PDU instead.

Remember that to properly calibrate any of these devices you will also need an accurate reference device to calibrate against.