optio50 / victron_modbus_tcp

Victron Modbus & MQTT Example

Victron_Modbus_TCP

Victron Modbus TCP & MQTT Example

Confirmed working with pymodbus 3.6.3

These file's are based on a system that has victron equipment in an "ESS" system. Multiplus, Solar charger, BMV

Regarding the GX MQTT keepalive.
run the keep-alive on the cerbo (or Pi) its self.

The file's are provided above, named Keep-Alive.py and Forever.py
The Keep-Alive.py is run via a kind of pseudo monitoring script (forever.py).
Place both files in the cerbo /data directory and make sure they are set executable. edit the /data/rc.local file (nano rc.local) and make an entry that looks like this

#!/bin/bash   
sleep 30   
/data/forever.py /data/keep-alive.py &

ctrl+o to write the file to disk and ctrl+x to exit
reboot the cerbo and the keep-alive should do its job.
the sleep command is to ensure the cerbo has had time to accomplish a full startup routine.

If you want to run the keep-alive in the script instead of the standalone keep-alive you will need the MQTT request in the update_value function with a counter or timer.

An example of the Victron TCP Modbus.
If you intend to use this example for yourself it will require tweaking a few things.

For starters you should download the victron xlsx register file from https://github.com/victronenergy/dbus_modbustcp/blob/master/CCGX-Modbus-TCP-register-list.xlsx
Check the tabs for the relevant information. Especially tab #2 Unit ID Mapping

Change the GX device IP address. Port is standard 502

Check Instance #'s from Cerbo GX and cross referenced to the unit ID in the Victron TCP-MODbus register xls file.

Change the the instance #'s to their correct values

You likely dont have the 3 temperature sensors included. Change the variable to turn them on and off.

PyQT5-Multiple-Chargers.py
PyQT5-Multiple-Chargers.ui

TK-VictronSolar.py

PyQT5-No-Multiplus-Single-Charger-JBD-BMS.py
This file is for a Raspi and a single Victron SmartSolar Charger. Also includes a Serial UART BMS (JBD in my case).
I have no idea if this works with the other compatiable BMS's. I only have a JBD.
Venus OS Serial BMS info
https://github.com/Louisvdw/dbus-serialbattery
USB Serial interface https://overkillsolar.com/product/usb-module-for-bms/
The connector included did not fit my BMS, YMMV. I cut the BMS BlueTooth cable in half and soldered the UART wire's to the connector wire's

To install
git clone https://github.com/optio50/Victron_Modbus_TCP
cd Victron_Modbus_TCP
chmod +x MODBUS_Example.py
chmod +x MQTT_Example.py
pip3 install paho-mqtt
pip install pymodbus
Change the VRMid and ip address, turn the analog sensors on or off in the script.
./MODBUS_Example.py
or
./MQTT_Example.py

To use the PyQt files you will need to.

pip install paho-mqtt
pip install pglive
install PyQT5 with your package manager.
such as sudo apt install python3-pyqt5
and sudo apt install python3-pyqt5.qtwebengine

The PyQT5-Multiple-Chargers.py and PyQT5-Multiple-Chargers.ui are PYQT5 files that are used together.
Same with PyQT5-Single-Charger.py and PyQT5-Single-Charger.ui
Just run the .py file and the .ui file will auto load.
execute in the cloned directory as the icon file is in that location.
Your system theme / font will dictate the style and appearence of the Pyqt program.

You must have the correct Victron equipment. such as Multiplus with ESS, BMV, Solar charger, Venus GX device.

victron_modbus_tcp's Issues

Pymodbus Version

Hello, first of all thank you very much for your work ! I am having errors (https://community.victronenergy.com/questions/252655/python-modbus-exception-response132-4-gatewaypathu.html?childToView=252734#answer-252734) interacting with my Victron devices, to be sure it does not come from the code, can you please provide the pymodbus version you are using ? Thank you very much !

No issue - have a enhance request for Example.py

Hi,

I'm very happy to foundthis script.
My plan are use the MultiPlus at external mode and give's him the GridSetPoint depends from the SoC.
so I reduce the script and try this

   # Battery value color
    if BatterySOC >= 95:
        print(clear,colors.fg.cyan,f" Battery SOC............. ",colors.bold, colors.fg.green,f"{BatterySOC:.1f}", " %", colors.reset, sep="")
    elif BatterySOC <= 95 and BatterySOC >= 12:
        print(clear,colors.fg.cyan,f" Battery SOC............. ",colors.bold, colors.fg.yellow,f"{BatterySOC:.1f}", " %", colors.reset, sep="")
    elif BatterySOC < 25:
        print(clear,colors.fg.cyan,f" Battery SOC............. ",colors.bold, colors.fg.red,f"{BatterySOC:.1f}", " %", colors.reset, sep="")
        **client.write_registers(address=2700, values="0" , unit=VEsystemID**
        continue
        #print("\033[K", end="")
        print(clear,colors.fg.green,f" Grid Set Point Watts.... {GridSetPoint}", sep="")

but thsi won't work.

my wish is that I feed-in start if the SoC are >94% until the SoC >11% with GridSetPoint 170 Watt.
otherwise the GridSetPoint are "0"

thx for some hints
regards