Open Energy Monitor

1. Open Energy Monitor
December, 2013
Engin Yöyen

2. Open Energy Monitor
• Open-source energy monitoring tools
• AC Electricity
• apparent power
• current
• voltage
• real power
• power factor
• Temperature
• Humidity
• Pulses (from pulse output utility meters)
• Elster IrDA (direct utility meter interface)

3. How does it work?
• Data Sensor Node (emontx)
• Base Station (emonbase)
• Web Application (emoncms)
• Display (emonGLCS)

4. How do you build one?
43 components (Resistors, Capacitors, RadioModule, Power&Jack
Sockets, etc.)

5. This is the result

6. Programming
Here is how you do it,
when you don’t have the FTDI to USB cable :)

7. Measuring

8. Visualisations

9. Results
40W < not reliable
100W < >10%.
100W > 10%,
150W > 6%
250W > 4%
500W > 2%.
Raspberry-Pi SD Card Failures (Limited number of writes)
Solution : Read-only file system

10. Questions?