I have a three-phase electrical system at home. I connected three SONOFF POW Ring Smart Power Meters to measure consumption. This way, I can measure the values for each phase and see the total.
The SONOFF POW Ring Smart Power Meter clamps are connected immediately after the electricity meter.
However, last month, while the electricity meter billed 125 kW of consumption, the SONOFF POW Ring Smart Power Meter measured 100 kW. That is, there is a 25% discrepancy.
This month, there’s another 25% discrepancy in the readings.
What could be causing this? Do the clamps have a specific orientation that affects the readings? Or can a calibration factor be added via the EweLink web interface?
Hi, not every measuring device has the same degree of accuracy and each meter has a different interval at which it measures values.
I have IMS at home (important). Then I have a Smart meter for the Huawei inverter (measures almost the same as IMS) and I also have a watt router, which measures inaccurately.
In short
Sonoff Smart meter is not calibrated or does not perform calibration.
Some Smart meters that I have tried have a deviation setting. Therefore, a correction can be set so that the measured values are consistent.
The aforementioned inaccuracy is okay.
The suggestion for Sonoff is that the inaccuracy could be set to either + or - so that the inaccuracy could be corrected.
The terminals have a specific orientation for the current to flow. They are usually arrows that indicate the direction to the house or the network. The meaning of the arrows is determined by the manufacturer.
It is enough that one or more arrows are turned so that the measurement is wrong or the phase sequence is not followed.
Please check the orientation of the clamp and the correct order of the clamps on the phases (whether the phasing is maintained).