Flexible and Scaleable
As a residential whole-house monitor IoTaWatt measures mains, individual circuits, and solar. Any voltage or frequency, single phase or three-phase, with easy installation and configuration. As a standalone unit it saves and displays years of detailed data, while also capable of uploading real-time usage to any of several popular cloud services.
As a commercial monitor IoTaWatt can handle single, split or three phase (Wye or Delta) and any voltage (120/208V, 230/400V, 277/480V, 347/600V etc.) CTs available up to 1000A. Fourteen circuits per unit scalable to any size using a local or remote WiFi connected database.
How it Works
IoTaWatt measures each circuit using a passive sensor that clips around one of the insulated wires of a circuit to measure the magnetic field created by current passing through the wire. The output of each current-transformer (CT) is very low-voltage and plugs into one of IoTaWatt's 14 inputs.
A wall transformer inserted into an ordinary receptacle provides IoTaWatt with a low-voltage reference from which it determines line voltage and frequency.
From the browser based configuration app, you select the model CT that is connected. IoTaWatt knows how to interpret the signals to produce an accurate measure of the power being used at any moment.
Measures 14+ circuits
Standard 3.5mm stereo jack input for 14 input channels. Each input is typically one current-transformer measuring one circuit, but a single CT can be installed to monitor multiple circuits, and/or several CTs can be combined into a single input.
All of the inputs are listed with name, CT type, and various options. To edit, click on the input number.
Change the name, or specify a different CT model from the dropdown list. Save and IoTaWatt begins using the new configuration immediately.
Comprehensive Status Display
The status of inputs and outputs is updated continuously. Outputs can be defined to make additional details available. The status of server uploads and context of the data-logs is available in drop-down tabs.
Integrated Analytic Tools
Integrated analytic tools allow viewing usage graphically. Show total power use along with individual circuits by selecting from a menu.
This graph app runs directly from IoTaWatt's web server. It was adapted from OpenEnergyMonitor's Emoncms system, which is well integrated with IoTaWatt.
Uploads to influxDB and Emoncms
More sophisticated users can configure data upload to influxDB and use Grafana or one of several other visualization tools to create stunning dashboards.
There is also an option to upload to the Emoncms system with it's own integrated graphical tools.
grafana dashboard with influxDB data source
Both of these external databases are open-software and available as commercial services or hosted on various personal platforms including windows and RaspberryPi.
PVoutput live-status display
Uploads to PVoutput
PVOutput is a free online service for sharing and comparing photovoltaic solar panel output data.
Output data can be graphed, analysed and compared with other pvoutput contributors over various time periods.
While pvoutput is primarily focused on monitoring energy generation, it also provides equally capabable facilities to upload and monitor energy consumption data. Both solar generation and energy consumption data can be combined to
provide a 'Net' view of energy being either generated or consumed live.
Simple Powerful Scripting
The "calculator" is IoTaWatt's simple interface for creating scripts to combine and export data. You specify the units to calculate (Amps, Watts, Volts etc.) and then enter the function to calculate the value. It's as easy as using a basic four-function calculator.
Three Phase Capability
IoTaWatt can handle three-phase power in several ways. The easy way uses just one voltage/phase reference transformer plugged into any of the three-phases. Power measurements on the two other phases are made using a "derived" three-phase reference signal.
For utmost accuracy, two additional transformers can be connected to inputs for "direct" voltage and phase reference of all phases.
IoTaWatt has been tested for compliance with regulatory and safety standards of North America and Europe including:
- Compliance with FCC part B
- CE compliance including Radio Emissions Directive (RED) and Low-voltage Directive
- Low-voltage safety standards for US (UL) and Canada (CSA). Testing and certification by Intertek and bears the ETL certification mark.
- Accessories sold by IoTaWatt, Inc are UL listed or UL recognized and listed for use with IoTaWatt.