[AC_DC]

I think that it is a bug and not a feature, because the power measurement of the 3 main phases (200 A sensors) coincide exactly (+- 2%) with the measurement of the built-in electricity meter, so the real power is measured there and not the apparent power as with the 50A sensors. If it were a feature for 3 phase systems, then the apparent power should be measured everywhere – right? I wish Emporia would take care of this problem, because from my point of view it is a pure software problem, because hardware-wise all necessary information is available (current, voltage, phase shift) to determine the real power. Evidence of this is the correct determination of the real power with the 200 A sensors. There is no reason why this should not also work for the 50 A sensors.

[AC_DC]

Hi,

Does it matter which color (black, red, blue) is connected to which phase?

I installed my Vue in a 3-phase system in Germany. Some devices (e.g. cooktop) show an idle power of 70 W, although according to the manufacturer the standby power is < 5 W. And 70 W real power in idle mode is simply impossible.
I have now made another attempt and have connected the Vue to only one phase (the phase to which my cooktop is also connected).
I have only connected one 200A sensor on the main line and one 50A sensor to the cooktop supply line, and also only one power supply for the Vue (black wire from wiring harness). In this configuration, the Vue showed 0 W idle power of the cooktop and when I turned the cooktop on the Vue showed 2000W – so everything was installed correctly. When I then reconnected all three phases (black, blue and red wire from wiring harness), the Vue again showed 70 W idle power for the cooktop and I didn’t change anything at cooktop. I guess that the 70 W is essentially apparent power and the Vue does not assign the phases correctly to the 50A sensors. Thus, the problem only occurs when connected to a 3-phase grid with 120 degrees phase shift between the phases. Is there a solution for this problem. Is it possible to manually assign the 50A sensors to the corresponding phases?

[AC_DC]

Hi,

Emporia writes the following on their FAQ page:

“… The Gen 2 samples voltage and measurement channels at approximately 24,000 samples per second. Twice per second, the Gen 2 uses these measurements to calculate root mean square averages for each of the voltage channels, and then intelligently pairs current channels with the correct voltage channel to calculate and report REAL power for each of the 19 CT’s in the app….”
see: https://help.emporiaenergy.com/hc/en-us/articles/4408877035415-How-does-it-work-

At another place one can read:

“… Through the wire harness, we’ll be able to detect voltage as well as other detailed power related information like phase, frequency and offset. We use those values to provide the most accurate measurements possible although not all are shown in the app at the moment…”
see: https://help.emporiaenergy.com/hc/en-us/articles/4408885421463-How-the-wire-harness-works

I therefore assume that the assignment of current sensors and corresponding phase is made automatically by the internal software. For small amounts of apparent power, the algorithm works quite reliably (Current and voltage have only a small phase shift) , but for large amounts of apparent power and thus very large phase shifts between current and voltage, it obviously no longer works. In this case, an option for manual assignment of current sensor and phase in the software would be desirable.

I am in contact with Emporia customer service and will report my results.

 

[Author]

Posts