Hi,
Couuld someone please explain this? I have a pool pump running starting at 9am, The graph of the current consumption shows a constant 3.7a within a small margin of error. The is a fairly constant at 240v. My power graph looks 
very wrong.
The expected power would simply be VxA=W this looks very wrong can someone please let me know how to correct this. For clarity i out a ammeter on the cable and the it reads 3.3 amps. its a 1kW pump.
Now added all meters on the same cable.
i dont understand
Please check whether there is "phase mismatch" in your installation.
https://www.iammeter.com/newsshow/blog-meter-accuracy#phase-mismatch-in-installation
the power is active power , active power =U * I * power factor
If you want to compare the three phase power ,please also make sure the voltage must be powered by the same phase .
Otherwise , the active power would not calucated correctly.
Please help, where to understand how to wire the CT to the WEM3080T. I understand the CT has a direction, but the two wires RED and BLACK which enter the underneath of the WEM3080T, which way round? red on the left? all of you videos do not show this and I assume this alters the direction of the power?
Please help me understand what the correct "factor"? I assume ist supposed to be 1 or the power calculations are very wrong.
Also are the A,B, C independent of each other? 
i have resolved this positive (red) to the left
For the CT diretion , there is K->L mark on the bottom of the CT and you need to keep the direction of K->L with the wiring diagram tutorial illustrated
Regarding the Power Factor:
The power factor is calculated using the formula:
Power Factor = Active Power / (Voltage × Current)
Of course, this value can differ for each phase depending on the load characteristics.
The power factor essentially reflects the phase angle difference between voltage and current.
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For a purely resistive load, the voltage and current are in phase, meaning the phase angle difference is close to zero.
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For purely inductive or capacitive loads, the phase angle difference approaches 90 degrees.
However, this assumes there is no phase mismatch in the installation.
In a typical three-phase WYE system, the phase voltage waveforms are separated by 120 degrees.
As I mentioned earlier, if you mistakenly supply Ua (voltage input for phase A) with the voltage from phase B, while the CTa (current transformer for phase A) is still clamped on phase A, this creates an artificial 120-degree phase shift, even if the load is purely resistive.
Example:
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Voltage: 220V
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Current: 1A
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Load type: Purely resistive
Correct Active Power = 220V × 1A = 220W
But if Ua is powered by phase B instead of phase A, a 120-degree phase angle is introduced.
Measured Power = 220V × 1A × cos(120°) = 220 × (−0.5) = −110W
This discrepancy is a classic case of installation phase mismatch.
Many thanks, I have completely rewired the monitors and checked the phases. The good news is that the solar monitors provide perfect measurements. I am now trying to calibrate the grid and special load. For these, I have "factors" which are not 1, which I assume is due to the ffeact that there are different devices causing load. Most appliances would be motors (fridge compressor, pool pump) and some a mixture, for example dishwater, which would have a motor and heater element, hence some induction and some resistance.
From you explanaition, it is not posible to get accurate readings of power usage in any household which has inductive loads, since the inductive load "factor" is cos 90 = 0, (angle shift approaches 90 deg)
So the important question, what measurement mechanisms due the power companies use in their household (first meter in the house from grid), and how to set up an iammeter system to match the same? Since the amperage is always correct, why not just sample each second and calculate power this way? what is the purpose of the "factor" and how to disable?
Normally ,the residential energy consumption cost (electrical billing)is calculated by the active energy, the unit is kwh.
Of course ,there is also reactive energy concept , unit kvarh, but this is usually concern only in industry field, such as the factory .
Hi,
So to clarify, the active energy (billed) is the same as restitive [with factor 1]??
Why does the WEM3080T, calculates the power using both inductive and resistive, even though most residential meters bill on resistive? this means there is always an error between the reporting of iammeter and the actual bills. What am I missing?
a few more questions,
1) since i rebuilt "My place" it would be nice to be able to zero the cumalative energy "import/export energy" production totals to start fresh? Can this be done simply?
2) Why when i turn on netmetering do i get a zero current output as the sum, even though the phases output do not sum to zero.
thanks
So to clarify, the active energy (billed) is the same as restitive [with factor 1]??
of course not , as I said ,the residential home electrical billing is calculated by active energy (kwh), only the industrial factory need concern about the resistive energy (kvarh).
So you can calculate the bill by simple multiple the electrical price to the kwh value(if it is fixed rate electrical price)
IMAMETER supports many billing template, please refer to https://www.iammeter.com/docs/set-power-tariff
You can think this question simply, the meter measures kwh data, represent the active energy ,which is used to calculated the electrical billing.
No matter what the power factor is ,the kwh would be measured by the meter ,and to be used to calculated the billing.
"Why does the WEM3080T, calculates the power using both inductive and resistive, even though most residential meters bill on resistive? this means there is always an error between the reporting of iammeter and the actual bills. What am I missing?”
All IAMMETER`s product can not only measure active power and energy but also reactive power and energy ,as IAMMETER also provide solution for industrial ,https://www.iammeter.com/applications/monitor-factory-energy-consumption and in industrial energy management, the reactive parament is also needed to be concern
1) since i rebuilt "My place" it would be nice to be able to zero the cumalative energy "import/export energy" production totals to start fresh? Can this be done simply?
These data is stored on the meter ,for security concern , it can not be reset by cloud . if you want to reset the kwh data ,you can only send a command via RS485 (connect wire on the meter)
In fact ,if you rebuild the "place" ,although there is a original data on kwh, it does not matter. IAMMETER-cloud only use the kwh difference value (not the absolute value) to calculate the billing and hourly/daily/monthly energy consumption analysis.
2) Why when i turn on netmetering do i get a zero current output as the sum, even though the phases output do not sum to zero.
there is no meansing of the current sum value in NEM mode, so we put zero .So as the voltage value(we use the value of phase A here).
If we put the sum current result here ,as the current is no sign,it would be confused.
Ex: power A : 1100W (positive value) , current 5A(PF =1)
power B : 1100W (positive value) , current 5A(PF =1)
power C : -2200W (negative value) , current 10A(PF =1)
so the nem power would be zero. but the current sum would be 20A.
In NEM(net energy metering) mode, only need to concern about the power(sum) and the two kwh data(forward ,reverse).
If you concern the current value ,you can view the current value of each phase, no need to concern the sum result