dbus-opendtu inverter

Integrate opendtu and with that all Hoymiles Interverter https://github.com/tbnobody/OpenDTU into Victron Energies Venus OS

Purpose

With the scripts in this repo it should be easy possible to install, uninstall, restart a service that connects the opendtu to the VenusOS and GX devices from Victron. Idea is inspired on @fabian-lauer & @vikt0rm project linked below.

Inspiration

This project is my first on GitHub and with the Victron Venus OS, so I took some ideas and approaches from the following projects - many thanks for sharing the knowledge:

• https://github.com/fabian-lauer/dbus-shelly-3em-smartmeter
• https://shelly-api-docs.shelly.cloud/gen1/#shelly1-shelly1pm
• https://github.com/victronenergy/venus/wiki/dbus#pv-inverters
• https://github.com/vikt0rm/dbus-shelly-1pm-pvinverter
• https://github.com/tbnobody/OpenDTU
• https://github.com/tbnobody/OpenDTU/blob/master/docs/Web-API.md

How it works

Details / Process

As mentioned above the script is inspired by @fabian-lauer dbus-shelly-3em-smartmeter implementation. So what is the script doing:

• Running as a service
• connecting to DBus of the Venus OS com.victronenergy.pvinverter.http_{DeviceInstanceID_from_config}
• After successful DBus connection OpenDTU is accessed via REST-API - simply the /status is called and a JSON is returned with all details A sample JSON file from OpenDTU can be found here
• Serial/MAC is taken from the response as device serial
• Paths are added to the DBus with default value 0 - including some settings like name, etc
• After that a "loop" is started which pulls OpenDTU data every 750ms from the REST-API and updates the values in the DBus

Thats it 😄

Pictures

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Install & Configuration

Get the code

Just grap a copy of the main branche and copy them to a folder under /data/ e.g. /data/dbus-opendtu. After that call the install.sh script.

The following script should do everything for you:

wget https://github.com/henne49/dbus-opendtu/archive/refs/heads/main.zip
unzip main.zip "dbus-opendtu-main/*" -d /data
mv /data/dbus-opendtu-main /data/dbus-opendtu
chmod a+x /data/dbus-opendtu/install.sh
/data/dbus-opendtu/install.sh
rm main.zip

⚠️ Check configuration after that - because service is already installed an running and with wrong connection data (host, username, pwd) you will spam the log-file, also check to set right ⚠️minimal log level⚠️ as possible

Change config.ini

Within the project there is a file /data/dbus-opendtu/config.ini - just change the values - most important is the deviceinstance, custom name and phase under "DEFAULT" and host, username and password in section "ONPREMISE". More details below:

Section	Config vlaue	Explanation
DEFAULT	AccessType	Fixed value 'OnPremise'
DEFAULT	SignOfLifeLog	Time in minutes how often a status is added to the log-file current.log with log-level INFO
DEFAULT	Deviceinstance	Unique ID identifying the OpenDTU in Venus OS
DEFAULT	CustomName	Name shown in Remote Console (e.g. name of pv inverter)
DEFAULT	Phase	Valid values L1, L2 or L3: represents the phase where pv inverter is feeding in
DEFAULT	Logging	Valid options for log level: CRITICAL, ERROR, WARNING, INFO, DEBUG, NOTSET, to keep logfile small use ERROR or CRITICAL
ONPREMISE	Host	IP or hostname of OpenDTU web-interface

Used documentation

• https://github.com/victronenergy/venus/wiki/dbus#pv-inverters DBus paths for Victron namespace
• https://github.com/victronenergy/venus/wiki/dbus-api DBus API from Victron
• https://www.victronenergy.com/live/ccgx:root_access How to get root access on GX device/Venus OS
• https://github.com/tbnobody/OpenDTU/blob/master/docs/Web-API.md

Discussions on the web

This module/repository has been posted on the following threads:

• https://community.victronenergy.com/questions/169076/opendtu-as-pv-inverter-in-venusos.html