Expected Reading Time: 7 minutes
In today's world, where energy efficiency and sustainability are becoming increasingly important, it is crucial to accurately understand and control the energy consumption of our household appliances. This is where the integration of PowerCalc into Home Assistant comes into play, a powerful tool that bridges the gap in energy measurement, especially for appliances that are not normally easy to measure.
From light bulbs and media players to smart sockets without built-in energy metering, PowerCalc offers an elegant solution for monitoring and analyzing their consumption. By using pre-defined templates for a wide range of devices from well-known manufacturers such as Philips, Amazon, Sonos, Osram and many more, PowerCalc makes it quick and easy to integrate these devices into your smart home system. This not only enables a deeper understanding of your own energy consumption, but also the opportunity to save costs and reduce your own electricity consumption through targeted measures.
Instead of measuring consumption directly, PowerCalc estimates it based on various pieces of information. In the case of a smart lamp, for example, it can take into account whether it is switched on, how high the brightness is set or even which color is currently active. The extension uses this data to calculate a power value in watts that is as realistic as possible and from this the energy consumption in kilowatt hours.
A simple example illustrates the principle: an LED lamp with a maximum power consumption of 9 watts does not always run at full power. If it is only operated at 50 percent brightness, the actual consumption is significantly lower. PowerCalc can take this correlation into account and calculate how much energy the lamp has consumed over the course of the day. The values then appear in the Home Assistant energy dashboard as if there were a real electricity meter.
PowerCalc is particularly interesting for users of smart lamps such as Philips Hue, IKEA TRÅDFRI or other Zigbee lamps. Many of these lamps already have stored consumption profiles. These are based on real measurements and enable a much more accurate estimate than a simple assumption such as „lamp on = 9 watts“. This also allows differences between different brightness levels or colors to be taken into account.
PowerCalc supports different calculation methods. The simplest variant is a fixed consumption value. This is suitable for routers, access points or network switches, for example, which consume the same power almost constantly. If the device is switched on, a previously defined watt value is applied. If it is switched off, the consumption is zero watts.
The linear calculation is somewhat more precise. Here, consumption increases in proportion to a certain value, for example the brightness of a lamp. At 100 percent brightness, the maximum output is assumed, and at 50 percent, around half.
The so-called lookup table method, often referred to as LUT, offers the highest accuracy. PowerCalc uses a table with real measured consumption values. A specific measured value is available for each brightness level or combination of settings. The result comes surprisingly close to a real electricity meter, even though no direct measurement takes place.
PowerCalc: An overview
PowerCalc is a custom component for Home Assistant that aims to calculate the estimated power consumption of lights and other household appliances.
The advantages of PowerCalc
- Consumption calculationDetermining the power consumption of connected devices based on their status (on/off, brightness, color, etc.).
- Energy monitoringIntegration with Home Assistant makes it possible to monitor energy consumption over time, which can be useful for efficient energy management and cost savings.
- Support for multiple device typesThe plugin supports a wide range of devices, from smart light bulbs to other smart home devices such as Alexa devices.
- User-defined configurationsUsers can define specific settings for their devices to obtain more accurate consumption data.
- Measure time periodsDevices or groups of devices can receive utility meters which, for example, calculate the consumption per day, per week or per month without any configuration of their own.
PowerCalc lives from the Home Assistant community, as it is constantly adding new devices and their respective energy values so that they are directly available as templates. However, you can also enter values manually and add virtually anything that can be accessed in Home Assistant.
Application examples
If you add a lamp that already exists as a template for a virtual sensor, as shown in the following image, then the settings look like this: you only have to select the device and the corresponding template for the model and then make adjustments regarding any desired utility meter, certain activation functions or multiplication factors.
With PowerCalc, we not only have the option of measuring devices with energy meters in Home Assistant, but also other electronic devices/objects whose values we know. We can choose between already stored templates (Virtual power (library), independently filled with values (Virtual power (manual) or real, already existing, energy sensors (Energy from real power sensor) choose.
In addition, we can even group energy sensors (Group), which is very useful for several lamps at a dining room table, for example. You still need a separate energy sensor for each lamp, but you can access the aggregated values of the group directly in dashboards and evaluations. Finally, you can also create a sensor for the daily energy of sensors of your choice (Daily energy).
Once you have set up your lamps or sockets without a measuring function, the whole thing looks like the picture below. PowerCalc simply adds the energy sensors as entities to existing devices and adapts perfectly.
For more detailed information, you can go directly to the GitHub page from PowerCalc. The Documentation I hereby also provide a link.
Installation of HACS and integration of PowerCalc in Home Assistant
Step 1: Installing HACS in Home Assistant
Home Assistant Community Store (HACS) is a custom add-on for Home Assistant that provides access to a variety of custom integrations and plugins developed by the community. How to install HACS:
- Check requirements: Make sure that your Home Assistant is ideally up to date.
- Download Execute script: Open a terminal for the Docker container version or the core version.
- Docker: Dial into the container with:
docker exec -it homeassistant bashor (similar) - Core: Switch to the user who is running Home Assistant
- Execute the following command for both variants:
wget -O - https://get.hacs.xyz | bash -
- Docker: Dial into the container with:
- Restarting the Home Assistant: After the files have been copied, restart Home Assistant.
- Integrate HACS into Home Assistant: In the Home Assistant interface, go to "Configuration" > "Integrations" > "Add" and search for HACS. Add it and enter your GitHub token if prompted.
For the supervised version, please refer to the Documentation of HACS itself to read about the installation.
Step 2: Add PowerCalc integration via HACS
Once HACS is installed, you can simply add PowerCalc:
- Open HACS: Go to HACS in the Home Assistant interface.
- Search for integrationClick on "Integrations" and use the search function to search for "PowerCalc".
- Install PowerCalcFind PowerCalc in the list and click on "Install". This will add the integration to your Home Assistant.
- Restarting the Home Assistant: Start Home Assistant again to apply the changes.
- Configure PowerCalcAfter restarting, you can set up and customize PowerCalc via "Configuration" > "Integrations" in Home Assistant.
Conclusion
With these steps, you have successfully installed HACS in your Home Assistant and added the PowerCalc integration. This powerful combination opens up a world of additional features and customizations that have been and are being developed by the Home Assistant community. More blog posts and videos on useful integrations to follow. If you don't want to miss out, subscribe to my YouTube channel!
YouTube video implementation
Conclusion
The strength of PowerCalc lies not only in its ability to measure and monitor consumption, but also in its simple integration and configuration through the use of templates for a wide range of devices from well-known manufacturers. This makes it much easier for users to get started and use the application. In addition, the ability to enter manual values offers enormous flexibility, making PowerCalc a versatile tool that can be adapted to almost any smart home system.
The installation of PowerCalc via HACS also demonstrates how closely and productively the Home Assistant community works together to develop and maintain such useful tools. This kind of community involvement ensures that PowerCalc is constantly being expanded and improved, making it a dynamic and future-proof tool.
In short, PowerCalc is an asset for any Home Assistant user who wants to make their home smarter and more energy efficient. It provides a deeper insight into energy consumption and offers the opportunity to save energy while helping to protect the environment. PowerCalc is therefore a perfect example of how technology can be used to make our lives more sustainable and efficient.
1 Comment
Power measurement of non-smart devices in Home Assistant - Sascha Brockel · 27. May 2024 at 12:05
[...] PowerCalc is exactly what it is and how you install it, I have already explained in the blog post Smart power measurement with PowerCalc in Home Assistant. Today, I'm going to focus specifically on how we can also measure non-smart devices [...]