Greetings from Belgium ! I am currently installing an OpenEnergyMonitor on my main fusebox. I live in Belgium, and my house is connected with 3phases - 3wires (no neutral, 220V between phases, 132V between phase & ground). Half of the country is wired like that, another half is wired with 1phase 2…

Hi Robert, I understood why emonTX was unable to correctly calculate the total power of my setup. I used L1-L2 as voltage reference, and measured i1 and I2 I thus moved the voltage measure to L3-L1, and kept CT1 and CT2 on L1 and L2. This works and correctly correspond to the 2watt-meter approach…

Welcome to the OEM forum, and thank you for your kind words. What do you mean by [image] pitouze: to make it compute the correct total power A fundamental principle of power measurement in a polyphase system is that you need one less wattmeter than the number of wires. That means, for a 3-w…

Thank you Robert for your reply. In my config, I don’t have neutral wire. Between all phases I have 220V, and between each phase & gnd I have 136V. With a small schematic of my breakerbox : [Capture%20du%202019-06-10%2008-41-18] (this installation configuration is very common in my country) So…

I’ll come back to this later.

I think I got the math on this problem CT1 measures current on L1 CT2 on L2 CT3 on L3 current in the load1 = i12 between L1 & L2 load2 = i23 between L2&L3 load3 = i31 between L3&L1 so CT1 measures i12 + i31 CT2 = i12 + i23 CT3 = i31 + i23 CT1+CT2+CT3 = 2* (i12 + i23 + i31) if I want load…

[image] pitouze: I can estimate the total power : Ptot = V12 x i12 + V23 x i23 + V31 x i31 When you measure the line currents, I think my sketch as published will give you the total power in all your loads in power1 (the first data item sent by radio, see sendResults( ) for its position in o…

Hello, I am from Belgium too :slight_smile: I just bought the EmonTX Shield to monitor my power consumption with an Arduino. I am exactly in the same configuration as ‘pitouse’ [pierre jauniaux] (3phases - 3wires (no neutral, 220V between phases, 132V between phase & ground)). as I am in the early …

If you look at page 4 of the documentation, near the middle, you’ll see the setting WIRES explained… If you change that in the sketch to #define WIRES 3-WIRE that changes everything so that the third phase is regarded as a neutral, the a.c. adapter is connected between phase 1 and phase 3, and ph…

Hi, thank you very much for your swift answer. This is perfect ! Best regards, Michel

Hey Michel, Keep me updated if it works “out of the box” in your case. In my understanding, we have to modify more deeply the sketch to make it work in our case. I didn’t have the time to modify the sketch yet and run some tests. With our configuration, the system can be totally unbalanced in curr…

Hi Pierre, I will do some tests, I effectively have some concerns, because I fear that when a load is consuming power between Phase1 and Phase2, this will not appear in the measurement (both measures on L1 and L2 will be of same value and opposite sign thus the sum will be zero). We have in our conf…

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3 phases - 3 wires, no neutral - power computation

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