Open Energy Monitor

December, 2013Engin Yöyen

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)

How does it work?

• Data Sensor Node (emontx)• Base Station (emonbase)• Web Application (emoncms)• Display (emonGLCS)

How do you build one?

43 components (Resistors, Capacitors, RadioModule, Power&Jack Sockets, etc.)

This is the result

Programming

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

Measuring

Visualisations

Results

Raspberry-Pi SD Card Failures (Limited number of writes)Solution : Read-only file system

40W < not reliable100W < >10%. 100W > 10%, 150W > 6%250W > 4% 500W > 2%.

Questions?