The SmartPi 3.0 expansion module adds voltage measurement and contactless current measurement interfaces to the Raspberry Pi, transforming it into a fully-fledged smart meter that monitors and records electricity consumption and generation, and makes this data available via a network or the internet. 

With the SmartPi 3.0, you can easily record and analyse electricity consumption data and use it as a basis for energy-saving measures. With the SmartPi, you can reduce your energy costs both at work and at home.
 
Die Strommessung erfolgt berührungslos über Stromklemmen, um in der Standardversion Ströme bis 100A zu messen. Ein einfach Umstecken der Jumper ermöglicht den Anschluss von beliebigen Kabelumbauwandlern mit einem Sekundärstrom von 1A. Damit können Ströme bis zu 700A und mehr erfasst werden.
 
Current measurement is carried out non-contact via current clamps, enabling currents of up to 100A to be measured in the standard version. Simply repositioning the jumpers allows any cable-type current transformer with a secondary current of 1A to be connected. This enables currents of up to 700A and above to be measured.

 

Der SmartPi misst alle wichtigen Daten:

The SmartPi measures all key data:

Voltages

Power

Active power

Reactive Power

Apparent power

Consumption

Production

Power consumption

Power production

Frequency

Cos Phi

With the SmartPi, electricity is measured contactlessly via a cable-mounted current transformer

Connectivity expert

Custom Node-RED modules enable integration into more complex control processes

The measurement data is read every second and stored in an InfluxDB database every minute. It is also possible to store the data in an external Prometheus database.

The SmartPi’s built-in web server makes the measurement data available in a graphical format, which can be easily accessed via a browser or a tablet/smartphone.


The SmartPi features MQTT and REST interfaces for integration with other energy management systems.

Thanks to the built-in EMETER protocol, the SmartPi can, in many cases, also replace an SMA Energy Meter.

A Modbus interface (TCP) completes the package.
In addition, CSV files containing energy measurement data can be saved to other servers via FTP.

 Custom Node-RED modules allow you to read the current measurement values and integrate them into flows. For example, you can set up the system to send you an email if performance thresholds are exceeded or not met.

Open-source smart meter for the Raspberry Pi

The SmartPi software is written in Go, is open source, and can be found on GitHub (https://github.com/nDenerserve/SmartPi).
It’s ideal for using the SmartPi in your own projects or for extending its functionality.

Examples of projects that can be built using the SmartPi:

  • Energy monitoring via the network and the internet
  • Mains frequency monitoring
  • Mains voltage monitoring
  • Alarme bei Stromverbrauchern
  • Alerts for high consumption
  • Integration into energy management systems
  • Cost control
All interfaces to the Raspberry Pi are electrically isolated, ensuring maximum safety.

 

The SmartPi 3.0 features an RTC (Real-Time Clock) to ensure reliable operation even without a network connection. The entire system is powered by the integrated power supply unit using the measured voltage. This eliminates the need for fiddly connections using power adapters on micro-USB sockets.

The case has a mounting bracket on the back for securing the SmartPi 3.0 to a DIN rail. The module is compatible with all Raspberry Pi models from version B+ 1.2 onwards and can be purchased as a standalone module, a kit or a fully assembled unit.
Softwarefeatures:

Real-time monitoring of current, voltage and power

Reading out a wide range of additional data every second

Save the values to the database every minute

MQTT-Support

Prometheus support (not yet documented)

Node-Red integration

Modbus-TCP

Modbus RTU (via expansion module)

CSV-FTP-upload

Web interface for display and configuration

EMETER Protocol

LoRaWAN support (via expansion module)

Features/Specifications:

Raspberry Pi-compatible connector

Raspberry Pi-compatible size

Electrical isolation

Integrated power supply from the voltage measurement path via stable terminals (optionally 2A DC current)

Open-source drivers and API

Three-phase current measurement

Connector for a cable conversion adapter with a secondary output of 50mA, 333mV and 1A (optionally 5A for the SmartPi 3.1)

Screw terminals for connecting current and voltage measurement

Compatible with all Raspberry Pi models

Buffered RTC (the Raspberry Pi continues to run stably even without an internet connection following a power cut)

High-quality housing with DIN rail mounting

External I2C connection via modular sockets

External SPI connection via modular sockets

Technical specifications

SmartPi module SmartPi with Raspberry Pi
Voltage measurement range 0–230 V rms

3-phase or 3 x single-phase
Current range depending on the current transformers (0–100 A with the supplied transformers)
3-phase (non-contact, using current transformers)
Measurement accuracy 2%
Power consumption 0.02W 3.7W
Connections Raspberry Pi connector LAN, 4x USB host, audio
Voltage measurement, current measurement, screw terminals
Pins used

3,3V, 5V, I2C1_SDA, I2C1_SCL
Dimensions (LxWxH) 108x90x55mm 108x90x55mm