Reddit reviews kuman KW48 Electricity Usage Monitor Plug Power Watt Voltage Amps Meter with Digital LCD, Overload Protection and 7 Display Modes for Energy Saving (Backlight), white
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【Electricity usage monitor】 Monitor is the killer of the high-cost energy appliance, helping you lower power consumption and save money.【Overload Protection】Overload warning displayed on LCD, when the whole power exceeds the rated power 1650W of monitor, LCD will display "OVERLOAD" with booming noise to warn the user, and automatically disconnect the power.【Upgraded Digital LCD Display】 The power consumption monitor with a large clear backlight LCD display, full wide view clear visible, make it easy to read and record the data, especially in the darkness.【Wide Usage】This electricity usage monitor measures various parameters: power (W), energy (kWh), volts, amps, hertz, power factor and maximum power (W), time, days - kWh is vital as this is what your electricity bills are based on!【Various Parameters】 Power(W), Energy (kWh), Voltage, Amps, Power Factor, Cost and Minimum & Maximum Power, ideal for energy consumption monitor.
Yes, there are a few devices designed to measure AC power usage which you could just put before the extension cord leaves your house, like this one:
https://www.amazon.com/dp/B07VX3PWJX/
This one has the 'data hold feature' as they call it... which means it won't lose it's shit if it loses power or you unplug it temporarily, so you can get a good idea for a week or so, or even season-long usage amounts. :)
I'd take readings on different days as far as how many KWh it used, make sure you get a wide range of different environmental temperature conditions in your data-set so we see how it's going to affect the power usage. :)