Hi. I am using a Sonoff POWR3 to read my electricity usage and also a POWCT that reads the same electricity usage because they are both connected to the same Live wire. Why do they give different readout. The POWR3 gives a 700Watt lower reading than the POWCT. Which device is giving the correct readout? For the total amount usage for today the 1 says 1.98kWatt and the other 2.8kWatt
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I have a POWCT, there is a difference of about 1 kW between the utility meter and this device based on a monthly consumption of 300 kWh. The discrepancy between the official meter and the POWCT is less than 1%. This one is likely the more accurate of the two. I don't have experience with the other model, but I hope this information helps.