An SMA EV Charger 22 wallbox has recently been added to my network. This is of course primarily used to charge an electric car.
Nevertheless, I was of course curious about which values could be read out and further processed there.
The Node Red code presented below is my current status. This can be used to read out the most common consumption and producer data. This means you can access individual values of the power network as well as the connected car.
Further information is summarized in this article.
Safety instructions
I know the following notes are always kind of annoying and seem unnecessary. Unfortunately, many people who knew "better" have lost eyes, fingers or other things due to carelessness or injured themselves. Data loss is almost negligible in comparison, but even these can be really annoying. Therefore, please take five minutes to read the safety instructions. Because even the coolest project is not worth injury or other trouble.
https://www.nerdiy.de/sicherheitshinweise/
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Requirements
Helpful articles:
To be able to install new nodes, NodeRed should of course already be installed on your RaspberryPi.
How to prepare a RaspberryPi and then install NodeRed on it is described in the following articles.
- RaspberryPi – setup for nerdiys!
- RaspberryPi – Tuee First configuration!
- RaspberryPi – Control the RaspberryPi via SSH
- NodeRed – Installing NodeRed on the RaspberryPi
- NodeRed – Install new nodes
- NodeRed - import and export node code
In the following lists you will find all the parts you need to implement this article.
Required tool:
| Number | Link |
|---|---|
| 1x | Screwdriver set Buy at Amazon |
| 1x | SD card reader Buy at Amazon |
Required material:
| Number | Link |
|---|---|
| 1x | Raspberry Pi Buy at Amazon |
| 1x | Raspberry Pi power supply Buy at Amazon |
| 1x | Raspberry Pi case Buy at Amazon |
| 1x | Micro SD card 64GB Buy at Amazon |
| 1x | SMA EV CHARGER 22 Wallbox |
Import Node Red code
In this section you will find the Node Red code you need. How you can import this into your NodeRed environment is in the article NodeRed - import and export node code described.
To use the node code linked below with your ESPEasy device, you need to make a few changes. These are described in the next section.
You can find the Node Red code in the Nerdiy Git repository at the following link:
In the gallery below you can see a photo of the view of the flow in the configuration view. As you can see, I was already able to assign/read most of the values. However, for some (less important in my opinion) the correct assignment is still missing. If you've figured this out, please leave me a comment.
In order for the Node Red Flow to work correctly, you must set the access data of the standard user of your wallbox in the area marked in red.
The retrieved data is displayed in the dashboard. Of course, you can adapt the code as you wish and further process the recorded data.
More articles about Node Red
In the following categories you will find further links on the topic of Node Red.
Have fun with the project
I hope everything worked as described for you. If not or you have questions or suggestions please let me know in the comments. I will then add this to the article if necessary.
Ideas for new projects are always welcome. 🙂
PS Many of these projects - especially the hardware projects - cost a lot of time and money. Of course I do this because I enjoy it, but if you think it's cool that I share the information with you, I would be happy about a small donation to the coffee fund. 🙂
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Hello,
how can I adapt the code to be able to read the data from the inverter and the battery inverter?
I look forward to an answer.
Hi Alex,
I will publish the instructions/code for the inverter soon. 🙂
Best regards
Fabian
Hi Alex,
I have just published the information to read out the Sunny Home Manager. 🙂
https://nerdiy.de/howto-node-red-sma-sunny-home-manager-daten-auslesen/
Best regards
Fabian
Hello,
I always get the message connecting to distribute_wallbox_data. So I get no connection although the access data to 1000% are correct.
I then installed Mosquito MQTT and tested it successfully, but it didn't help.
Do you have a tip what else I should do besides importing your flow and entering the login data?
Hey Toby,
Just to rule that out (sorry for the potentially stupid question) you entered the access data to your MQTT server into the “distribute_wallbox_data” node, right? Not the login details for the wallbox. 🙂
Best regards
Fabian
Hi,
the code works fine, but now I'm wondering whether the constant reading and writing is harmful to the wallbox. Can you tell me more about that?
I have regulated it so that I first query the house consumption and if it is over 10kW the box is only queried.
Only with excess charging does this not work because of the lower charging capacity.
Greetings,
novel
Hi Roman,
Even if I don't know the SMA software in detail (of course), I wouldn't worry about it. On the one hand, the data is only read and not actively set which parameters. There shouldn't be a writing process there.
If one were to take place (which, as I said, is very difficult for me to imagine because it simply doesn't make sense from a technical point of view or is even unwise) it is actually now standard for the manufacturer to take care of the “wear leveling”.
Either too frequent write operations would be prevented or handled accordingly in order to prevent the memory cells from wearing out too early.
I've been using the code shown for about a year and so far everything works as it did on day one. 🙂
Of course I can't give you a guarantee. :/
Best regards
Fabian
Hello Fab,
Thank you for your detailed reply. Wear leveling didn't tell me anything at all. Learned something again.
Best regards
novel
Hi Florian, no, those are the correct login details for the wall box. 🙂
With the Mqtt I tested whether it might have to be installed. But I think I was on the wrong track there.
I then tested further and found that running it manually to get the token works on my PC in the DOS box, but if the command is run via Node Red from my Home Assist installation, there is no response. This is empty, which means that I logically get a json parse error. I think that's the main problem for me right now.
Do you have to install anything else to be able to issue these commands?
Hi Toby,
You only need the mqtt part if you want to forward the retrieved data to an MQTT server. If you don't need it, you can also delete the MQTT node. 🙂
It just occurred to me that the “curl” package may not be installed. This is necessary to retrieve the data. Can you test whether curl is installed by, for example, entering “curl -I google.de” into the terminal of your HomeAssitant? (The command simply retrieves the header from google.de and gives you the information).
Best regards
Fabian
I finally found the problem thanks to your tip about running curl in the terminal:
The curl command must not be in double quotes after the -d but must be in inverted commas. And already I get a result and everything works.
Now I'm going to take a closer look at everything.
Hey Toby,
good to hear it's working now. Thanks for the feedback and have fun with it. 🙂
Best regards
Fabian
Hello Fabian,
I get the status “connected” under “distribute_wallbox_data” but the dashboard doesn’t output any values. What could it be?
Greetings Mark
Hi Mark,
Without changes, the specified code does not output any data on the dashboard. The “distribute_wallbox_data” node is used to forward the data via MQTT to an MQTT server. 🙂
Of course, you can also extend the code a bit so that the data is also displayed on the dashboard. You can find information about the dashboard nodes here, for example: https://nerdiy.de/de_de/nodered-mit-dashboard-nodes-eine-benutzeroberflaeche-erstellen/
Best regards
Fabian
Mhhh Ok, I still don't understand how to get the data... I'm just a daU