3-phase power instead of voltage for P1 smart meter

[McWil]

Domoticz nicely detects new smart meters using DSMR 4.x protocol and provides 5 devices, power, gas and 3x voltage. It would be much more useful to register (and graph) the power usage of the three phases (that are also in the P1 telegram) rather than the three voltages. Should be relatively easy to change when parsing the P1 telegram...?

Martijn

[pwhooftman]

power usage isn't measureable per phase in a 3 phase system. The power usage is formed by the 3 phases combined, because the sine waves of each phase is 120 degrees shifted from the other phases.

[RichieB]

My E350 smart meter does report the power per phase via OBIS references 21.7.0, 41.7.0 and 61.7.0, see also this reference. As McWil says, it would be much more useful to display the power per phase instead of the voltage. How can we achieve this?

Edit: it looks like the E350 P1 OBIS references are hardcoded.

Code: Select all

1-3:0.2.8(50)
0-0:1.0.0(181021003949S)
0-0:96.1.1(xxxx)
1-0:1.8.1(002884.003*kWh)
1-0:1.8.2(000964.457*kWh)
1-0:2.8.1(000000.000*kWh)
1-0:2.8.2(000000.000*kWh)
0-0:96.14.0(0001)
1-0:1.7.0(00.871*kW) 
1-0:2.7.0(00.000*kW)
0-0:96.7.21(00013)
0-0:96.7.9(00001)
1-0:99.97.0(1)(0-0:96.7.19)(180704181350S)(0584036030*s)
1-0:32.32.0(00000)
1-0:52.32.0(00001)
1-0:72.32.0(00001)
1-0:32.36.0(00000)
1-0:52.36.0(00000)
1-0:72.36.0(00003)
0-0:96.13.0()
1-0:32.7.0(234.0*V)
1-0:52.7.0(233.0*V)
1-0:72.7.0(234.0*V)
1-0:31.7.0(000*A)
1-0:51.7.0(002*A)
1-0:71.7.0(002*A)
1-0:21.7.0(00.018*kW)
1-0:41.7.0(00.440*kW)
1-0:61.7.0(00.412*kW)
1-0:22.7.0(00.000*kW)
1-0:42.7.0(00.000*kW)
1-0:62.7.0(00.000*kW)
0-1:24.1.0(003)
0-1:96.1.0(xxx)
0-1:24.2.1(181021003505S)(02546.060*m3)
!1C83
~/XMX5LGBBLA4415427303

[domoticzag1]

power usage isn't measureable per phase in a 3 phase system. The power usage is formed by the 3 phases combined, because the sine waves of each phase is 120 degrees shifted from the other phases.

This is not true. You get 3 phases, 120 degree shifted in phase with the same magnitude, with a common ground. Power can perfectly be measured in these systems by measuring the current and voltage per phase and multiplying these per phase. The sum of the powers is the total power usage.

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