Thanks, I got it!
This is terrified me hahahahha!
Regarding to the standard issue, I did some research and guess this might be the reason.
Therefore, I am planning to trade in two more CTs for my project: one Arduino with three different rating CTs so that we can have better accuracy to deal with different conditions:
900A, 450A, and maybe 100A.
You are right, I bought the non-polarized capacitor and got them test on my room air-con.
Below is the divider resister voltage with polarized and non-polarized capacitor, as you can see, after I replaced the capacitor into non-polarized type, the divider voltage came equilibrium:
However, I tested both ways on my room aircon, they show quite similar reading. This corroborated your statement .
Below is the testing result:
a) Total rated power: 1835W
b) Total Rated Current: 8.10A
c) Max. Current: 10.6A
I set the temperature at 28A, hence I guess both of the reading is not correct and are higher. Besides, Non-Polarized Capacitor’s reading is slightly higher than Polarized Capacitor. It seems like Polarized one has better accuracy, but since the divider voltage is equilibrium with Non-polarized capacitor, I guess I will still stick with the non-polarized one :
- Polarized Capacitor:
- Non-Polarized Capacitor:
Finally, thank you very much Mr Robert, I think I have got my problem solved already.
The reason I build this project is for the solar project quotation purpose. Before we determine a solar system, client’s power load profile is the most important criteria. Normal commercial energy meter like Fluxo is much too expensive, as I may need to measure the power load at a few sites in one day. It is not realistic to invest so much money for few Fluxo energy meter just to log amps data, especially since I don’t need very accurate data.
This project is so meaningful, thank you Mr Robert and OpenenergyMonitor!