Power Consumption M...
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Power Consumption Meter

Senior Member

Hullo All,

After some advice and recommendation please.

I'm looking for a piece of hardware that can monitor the power consumption of a device. There are plenty of these sorts of things on Amazon - but I'd like one which can record and log quite a degree of granularity over time.

e.g. I don't just want the average wattage for the day, but I want to know the wattage per hour for example.

Ideally I would want a device which can either can export data or can be queried programmatically, rather than having to read and transcribe from the screen on the device.

I am not adverse to a bit of electronic tinkering if necessary, but I would like to be able to identify the error margin that the device is operating within. e.g. +/- 0.1% accuracy.

Does anyone have any suggestions, ideas or comments ?

Thanks in advance,


Topic starter Posted : 15/04/2021 1:56 pm
Community Legend

I believe you want (loosely) something like these:


One (or more) meter(s)+ a "data logger/concentrator". 

Forget about the 0.1% accuracy, from this kind of devices it is more likely 0.5-1.0%, but this range of accuracy is good for - say - 99.999% of possible uses, and it is "tough stuff" used in industrial plants for a relatively cheap price.

Of course there are much cheaper devices, but they usually have SD cards they write to, and depending on the intended use it could be inconvenient.



Posted : 18/04/2021 2:57 pm
Senior Member

@jaclaz Thank you very much indeed. Will investigate further.

Topic starter Posted : 19/04/2021 5:43 pm
Active Member

Also be aware that the cheap units do a really bad job of dealing with power factor. i.e. they report the wrong values, especially with low power devices.

We use this unit


Which has a serial output port.


Posted : 03/05/2021 5:14 am