Smart Home Plugs – Power Measurements

Have you ever wondered how much electricity your smart plugs are using up in your house just sitting there idly waiting for a command to turn on and off? Thankfully, Michael Ritter from the Home Assistant community took the time to test out a bunch of popular plugs using a power meter in between to get the values for us.

Michael used a standard off the shelf Power Monitor for these tests similar to this one. The smallest power consumption recorded on it is 0.1 watt so if you see 0.0 below in the pictures, it is assumed that the device required less than 0.05 watts. Each test state was about a minute or so to let the power value stabilize. Nothing was plugged into the devices so you can see the additional overhead added to the power consumption when on.

Here are the results:

Device – (With US Amazon links to some)OnOff
IKEA TRADFRI control outlet1.00.0
Osram Smart Plug1.90.5
Xiaomi Mi Smart Plug0.50.0
Innr SP1201.30.0
Gosund SP1 (Wifi)1.70.0
Gosund SP111 (Wifi)1.30.0
Shelly Plug S (Wifi)0.50.5

All of these plugs are pretty energy efficient with the Xiaomi Mi Smart Plug coming in with the best results with the Shelly as my second pick.

I run solar in my home so I’m always on the look out for energy vampires. Devices that sit in standby and just use up watts behind your back. It’s great to know that most of these smart plugs add very little overhead and save tons in the long run when combined with smart automation programs like Home Assistant.

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Thanks for sharing your research Michael and Happy Automating!