P1 API module

This module can be used to read P1 telegrams from a serial interface. I purchased a pre-build P1 FTDI cable after several DIY experiments failed. I purchased this one , but a quick internet search should yield several. The P1 API module automatically reads a full telegram from the serial interface, checks to make sure there are no CRC errors and then computes and stores current net power consumption and total net energy consumption.

Usage example

Simply import the package and initiate a client by providing the port name the FTDI cable is connected to. Then read a single telegram by calling the read_telegram functions. Power and energy data can then by obtained by calling the associated get functions.

import P1

p1_client = P1.Client('/dev/ttyUSB0')
p1_client.read_telegram()

print('Current net power consumption : %.2f [kW]' % p1_client.get_power())
print('Total net energy consumption  : %.2f [kWh]' % p1_client.get_energy())

Net power and energy consumption calculation

Net power consumption is computed by substracting current power export (1-0:2.7.0) from current power import (1-0:1.7.0). Total net energy consumption is computed by substracting total net energy export (1-0:2.8.1 (low) and 1-0:2.8.2 (high)) from total net energy import (1-0:1.8.1 (low) and 1-0:1.8.2 (high)).

Reference telegram

This reference telegram would yield the following values:

• Power: 6.00 kW
• Energy: 44.32 kW

/XMX5LGBBFG10

1-3:0.2.8(42)
0-0:1.0.0(181225103211W)
0-0:96.1.1(4530303331303033313034393833373135)
1-0:1.8.1(002640.860*kWh)
1-0:1.8.2(001164.335*kWh)
1-0:2.8.1(001076.832*kWh)
1-0:2.8.2(002684.048*kWh)
0-0:96.14.0(0001)
1-0:1.7.0(00.006*kW)
1-0:2.7.0(00.000*kW)
0-0:96.7.21(00008)
0-0:96.7.9(00003)
1-0:99.97.0(3)(0-0:96.7.19)(170214183908W)(0000006810*s)(161018133550S)(0000005875*s)(160604162916S)(0000011017*s)
1-0:32.32.0(00000)
1-0:32.36.0(00000)
0-0:96.13.1()
0-0:96.13.0()
1-0:31.7.0(002*A)
1-0:21.7.0(00.006*kW)
1-0:22.7.0(00.000*kW)
!2FE6