Introduction

This code was made to read out the data exposed by an Eastron SDM630 (but probably also others) energy meter. It consists of 2 parts:

• dump_all.py simply dumps all known registers for human inspection
• read_influx.py reads some chosen registers, and ingests them to my InfluxDB

Sample output

Example output on a 3-phase delta (i.e. 3 wires, no neutral) configuration::

# venv/bin/python dump_all.py /dev/ttyRS485
Phase 1 line to neutral volts [V] = 0.0
Phase 2 line to neutral volts [V] = 0.0
Phase 3 line to neutral volts [V] = 0.0
Phase 1 current [A] = 0.9989702701568604
Phase 2 current [A] = 4.772903919219971
Phase 3 current [A] = 2.321788787841797
Phase 1 power [W] = 92.05419921875
Phase 2 power [W] = 0.0
Phase 3 power [W] = 521.0418090820312
Phase 1 volt amps [VA] = 234.46800231933594
Phase 2 volt amps [VA] = 0.0
Phase 3 volt amps [VA] = 545.4363403320312
Phase 1 volt amps reactive [VAr] = -215.6415252685547
Phase 2 volt amps reactive [VAr] = 0.0
Phase 3 volt amps reactive [VAr] = 161.2955780029297
Phase 1 power factor [] = 0.3926132321357727
Phase 2 power factor [] = 1.0
Phase 3 power factor [] = 0.9552701115608215
Phase 1 phase angle [º] = 0.0
Phase 2 phase angle [º] = 0.0
Phase 3 phase angle [º] = 0.0
Average line to neutral volts [V] = 234.81521606445312
Average line current [A] = 4.762885570526123
Sum of line currents [A] = 14.288656234741211
Total system power [W] = 614.8851318359375
Total system volt amps [VA] = 781.4191284179688
Total system VAr [VAr] = -55.0536994934082
Total system power factor [] = 0.9960189461708069
Total system phase angle [º] = -5.117457866668701
Frequency of supply voltage [Hz] = 50.027801513671875
Import Wh since reset [kWh] = 244.02200317382812
Export Wh since reset [kWh] = 0.0010000000474974513
Import VArh since reset [kVArh] = 69.47200012207031
Export VArh since reset [kVArh] = 95.9469985961914
VAh since reset [kVAh] = 294.80615234375
Ah since reset [Ah] = 1442.406982421875
Total system power demand [W] = 590.9715576171875
Maximum total system power demand [W] = 5762.7353515625
Total system VA demand [kVA] = 743.248779296875
Maxumum total system VA demand [kVA] = 7024.75927734375
Neutral current demand [A] = 0.0
Maximum neutral current demand [A] = 0.0019397907890379429
Line 1 to Line 2 volts [V] = 234.70968627929688
Line 2 to Line 3 volts [V] = 234.9207305908203
Line 3 to Line 1 volts [V] = 234.81529235839844
Average line to line volts [V] = 234.81521606445312
Neutral current [A] = 0.0
Phase L1-N volts THD [%] = 0.0
Phase L2-N volts THD [%] = 0.0
Phase L3-N volts THD [%] = 0.0
Phase 1 current THD [%] = 441.9278564453125
Phase 2 current THD [%] = 0.0
Phase 3 current THD [%] = 188.58114624023438
Average L-N volts THD [%] = 0.0
Average line current THD [%] = 315.2545166015625
Phase 1 current demand [A] = 0.8047537803649902
Phase 2 current demand [A] = 2.150317668914795
Phase 3 current demand [A] = 2.359823226928711
Maximum phase 1 current demand [A] = 13.310205459594727
Maximum phase 2 current demand [A] = 24.01046371459961
Maximum phase 3 current demand [A] = 24.498693466186523
Line 1 to Line 2 volts THD [%] = 0.0
Line 2 to Line 3 volts THD [%] = 3.58048152923584
Line 3 to Line 1 volts THD [%] = 0.0
Average line to line volts THD [%] = 1.79024076461792

Installation

No installation is required, but some python modules need to be present. It is recommended to use virtualenv::

python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt