Fronius Modbus Integration

redpomodoro · December 2, 2024, 10:02am

To make it easier to use control a Fronius Gen24 inverter with battery storage and smart meter I’ve created a new custom integration:

Notes:

Still working on getting the integration into HACS repository, so if you want to use you need to copy it manually.
The integration provides a basic set of data points needed for monitoring and controlling the battery storage.
Only tested Gen24 inverter with battery storage system. In theory it should work without battery storage too.

As it is my first integration expect some breaking changes to come…

Any ideas for improvement are welcome!

Klangen82 · December 3, 2024, 2:47pm

Do you have any screenshots or examples that showcase what can be achieved with this integration?

Karle · December 4, 2024, 9:19pm

I would also be interested in more information about this

redpomodoro · December 5, 2024, 9:13am

Here are some screenshots of the devices created by the integration, starting with the Battery Storage:

And showing the actions for the battery storage:

Inverter device:

Meter device:

Klangen82 · December 5, 2024, 4:54pm

Thanks! It looks awesome! Hate to be that person , but I did flag an issue on GitHub. Seems like I can’t add the inverter . Think you could work your magic on that?

github.com/redpomodoro/fronius_modbus

Fronius Modbus Integration Fails to Load: 'No setup or config entry setup function defined' Error

opened 04:52PM - 05 Dec 24 UTC

Klangen82

**Describe the issue you are experiencing** I am unable to add the inverter usi…ng the Fronius Modbus integration. **Describe the expected behavior** The inverter should be added as a device successfully. **To Reproduce** 1. Downloaded the Fronius Modbus integration and placed it under \\IP-ADDRESS\config\custom_components\fronius_modbus. 2. Added the integration via + Add Integration. 3. Entered the inverter's IP address and the address (200 in my case). 4. Pressed Submit. The process appeared successful, but the integration failed to load. (even after reboot) ![image](https://github.com/user-attachments/assets/da7e25d5-ac19-4ba0-bfb2-7e7bc6b9355d) I looked in the log and see the following error message: ![image](https://github.com/user-attachments/assets/05a91430-0f9e-4ec7-862a-ab124328f0d3) I use Node-Red with the mobus settings and it's working for me, can control battery etc. I have disabled the Node-Red Mobus before I tried to add this integration just to be sure there where no clonflicts. **What version of Home Assistant Core is installed** Core 2024.12.0 Supervisor 2024.11.4 Operating System 14.0 Frontend 20241127.4 **What version of Fronius Modbus integration is installed** Release 0.1.0 **What Inverter and extras are you using** Gen24: 8kW (Firmware 1.33.7-1) SmartMeter: TS 65A-3 Battery System: BYD Battery-Box Premium HV **Modbus setup** ![image](https://github.com/user-attachments/assets/4e5de800-2a8d-4e7a-88c4-752b525e378c) **Error message shown within Home Assistant log** Logger: homeassistant.setup Source: setup.py:269 First occurred: 17:21:17 (1 occurrences) Last logged: 17:21:17 Setup failed for custom integration 'fronius_modbus': No setup or config entry setup function defined. **Diagnostics information of Fronius Modbus integration** As the integration doesn’t load, diagnostics information is not available.

Rainman67 · December 7, 2024, 12:06pm

Hi, I have the same problem as Klangen82. Do you have any idea, what’s the problem?

redpomodoro · December 9, 2024, 9:03am

I’ve started to add some description on the data points and what the actions do:

github.com

redpomodoro/fronius_modbus/blob/main/README.md#usage

[![hacs_badge](https://img.shields.io/badge/HACS-Default-orange.svg)](https://github.com/custom-components/hacs)

# fronius_modbus
Home assistant Custom Component for reading data from Fronius Gen24 Inverter and connected smart meters and battery storage. This integration uses a local modbus connection instead of the cloud based SolarWeb integration. 

> [!CAUTION]
> This is a work in progress project - it is still in early development stage, so there are still breaking changes possible.
>
> This is an unofficial implementation and not supported by Fronius. It might stop working at any point in time.
> You are using this module (and it's prerequisites/dependencies) at your own risk. Not me neither any of contributors to this or any prerequired/dependency project are responsible for damage in any kind caused by this project or any of its prerequsites/dependencies.

# Installation
Copy contents of custom_components folder to your home-assistant config/custom_components folder or install through HACS.
After reboot of Home-Assistant, this integration can be configured through the integration setup UI.

Make sure modbus is enabled on the inverter. You can check by going into the web interface of the inverter and go to:
"Communication" -> "Modbus"

And turn on:
- "Control secondary inverter via Modbus TCP"

This file has been truncated. show original

To make it clearer I will add another table to show which setting is being used by the various actions.

farmio · December 9, 2024, 11:57am

Hi !
Just out of curiosity:
My Symo Snap-in Inverter also has a Modbus interface. According to the documentation, this is “SunSpec” compatible SunSpec Modbus Specifications - SunSpec Alliance .

Would you happen to know if all Fronius inverters / Dataloggers support Modbus - and have compatible registers?
Further, are those SunSpec specifications defining exact registers so those are fully compatible with your integration?
If so, could a generic “SunSpec Modbus” integration do the same as yours - or are there vendor / Fronius specific details that have to be considered?

If you need someone to test this on non-Gen24 Symo inverters, I’d be happy to help.

Also, as the maintainer of the current Fronius Core Integration, I’d be happy to help if you are interested in bringing this to HA Core.

Btw.

current Core Integration doesn’t use cloud, but local json API

orgiz · December 9, 2024, 1:29pm

Hi!

This looks like a great and useful integration! Unfortunately, I’m having trouble using the “Grid Charge Power” function – nothing happens when I change that parameter. The charging is stuck on 500 W.

I have set “Storage Control Actions” to “Charge from Grid” and then tried to limit how many watts it should charge with. However, there is no effect when I adjust the slider.

Could this be related to the “Max Charging Power” sensor? For some reason, it shows -24,576 W for me.

Primo GEN24 6.0
Firmware: 1.30.7-1

redpomodoro · December 12, 2024, 9:50am

I’m working on a new version that is more intuitive to use. Currently the order of changing settings needs to be followed.

redpomodoro · December 13, 2024, 8:39pm

Just pushed out a new version with reworked Storage Control Mode behavior. The relevant inputs can be changed when the mode is active. See the documentation which controls are used and which are ignored in the various modes. Hopefully this makes it more intuitive to use the controls.

Unfortunately I didn’t have enough time and enough sun light to test all scenarios.

redpomodoro · December 13, 2024, 8:54pm

@Farmio to answer your questions:

So far I know more Fronius inverters support Modbus and they should be mostly compatible.
The integration uses SunSpec format for Inverter and Meter data, but for actually controlling the registers it seems Fronius specific. At least the SunSpec integration cannot control it.

It would be great to integrate this into current Fronius Core integration, but it will be good to get storage controls solid first.

What inverter do you exactly have? I can add it to list of supported inverters so you can test if it works.

farmio · December 13, 2024, 11:28pm

I have two non-Hybrid SnapIn Inverters on two different grid interconnection points: a Symo 5 and a Symo 20. Both connected to a Fronius SmartMeter. No battery, no Ohmpilot.

redpomodoro · December 21, 2024, 12:02pm

Just pushed out a new releases with the following changes:

Added control for discharging the battery to the grid
Disabled check for Gen24 inverters, so allowing to test the integration with other types of Fronius inverters.
Minor bug fixes/tweaks

AndreT1 · December 21, 2024, 12:34pm

This is just great, I was getting crazy remembering each evening to start the charging from grid manually… I’ll definitely test this.
May I ask you some screenshot a for comparing the integration and the fronius local interface?

I usually define only the minimum change rate to like 1000 W for 4-5 h during the night so I charge into the battery the 5kWh I’ll Need during a cloudy day. Is the logic the same?