What is openZmeter?

Smart metering and power quality analysis for the people.

openZmeter (oZm) is an opensource system aimed to help people to analyze and visualize power quality and electric energy in power networks. It has been designed to comply with international standards such as IEC 61000-4-30 and EN 50160 with a very reduced form factor (just a cigarette packet!!).

oZm was born as a collaborative project between the University of Almeria UAL and the University of Granada UGR based on some strong ideas: to offer an effective tool that transparently applies advanced mathematical algorithms, to obtain accurate electrical measurements and open the system to the community to promote awareness in energy saving. Based on the aforementioned ideas and the social responsibility of the university, we feel the commitment to open this result to the community.

oZm system

As an effort to build a professional grade hardware, it is able to measure single phase RMS voltages with an accuracy up to 0.1%, frequency up to 10 mHz (between 42.5 and 57.5 Hz for european systems) and RMS currents according to different sensor probes (the basic version can handle up to 400 V and 50 A RMS using an onboard Hall effect sensor with a precision of 1%). Please check, the complete list of features.

Technical

What is it made of?

  • Powerful hardware

    Based on STM32 micro and NanoPi Neo Air ARM board.

  • High sampling rate

    Sampling rate of 16525Hz for harmonic measurement up to order 50.

  • Data aggregation

    Voltage, current and frequency data aggregation of 10 cycles, 3 seconds, 10 minutes and 1 hour.

  • Alert system and event management

    ITIC / CBEMA curves, frequency, voltage events.

  • High connectivity

    Wifi and USB ports available. SPI, I2C, UART and PWM are also available

  • 4 Quadrant measurements

    Measure energy generation and consumption. Suitable for renewable energy systems.

  • Modular and flexible

    Modular by design for a simple and easy extension.

  • International standards compliance

    IEC 61000-4-30 and EN 50160. Accuracy for voltage measurement up to 0.1%. Frequency measurement up to 10 mHz. Current measurement up to 50 A with integrated Hall effect sensor.

  • Advanced math

    FFT and digital filter zero-crossing algorithms. Wavelet and advanced math on the road.

  • API for energy prices

    Gets daily energy prices as an option. Ready for Spanish ESIOS system.

  • Real time measurements

  • RMS values for voltage and current
  • Active, reactive and apparent power
  • Power factor and phase angles
  • Harmonics for current and voltage (up to 50th)
  • Active and reactive energy
  • Frequency
  • Voltage events (swell, sags/dips, interruptions, etc)
  • ozm
  • ozm
  • ozm

Other features

But that isn't all!
Energy saving
Monitor your home electric energy to understand your pattern usage and explore your daily consumption. Energy Saving
Professional grade hardware
Built with reliable components to get professional and accurate measurements to comply with standards
High quality
oZm samples at 16525Hz so harmonics up to 50 are captured. Channel agreggations from 3 seconds to 1 hour based on a 200ms window.
Beautiful graphs
oZm provides nice graphs with zoom, pan, filter and other capabilities to show clear and beautiful visualizations
Realtime computation
oZm comes with RealTime linux ARM board and STM32 microprocessor, allowing realtime acquisition and processing of data
OpenSource
The project is opensource and openhardware so you can contribute!!! Open Source - GNU
Intuitive Dashboard
Non-experienced users can track their electrical information at a glance with minimal knowledge of power systems.
Telegram Integration
Awesome!!! You can talk to your ozm and receive reports or notifications when something is wrong in your home.
Powerful API
We built a powerful api to query ozm and get detailed responses for every computed parameter.

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