question

Hi Paul, Maybe it would be better sharing your broader setup and what you are trying to achieve. There maybe a better solution that writing and maintaining a script. While people can point you in the right direction, you need a fair amount of programming knowledge to actually create and maintain it.

At a high level you will need to access the dbus, to read SOC from the battery, make a decision and then write a predetermined value back to dbus to switch the device on and off.

The dbus path and value you will need to switch the multiples on and off is the /Mode parameter of the com.victronenergy.vebus service.

Some good reading on dbus and VenusOS would be these two links

https://github.com/victronenergy/venus/wiki/dbus-api

https://github.com/victronenergy/venus/wiki/dbus#vebus-systems-multis-quattros-inverters

you may also find some information in here useful as you are sort of writing a driver..

https://github.com/victronenergy/venus/wiki/howto-add-a-driver-to-Venus

You will likely want to make use of the python velib library as it will help with a lot of the dbus interfacing, https://github.com/victronenergy/velib_python. There are two example services included, but nots are how useful they will be.

Maybe look at VenusOS Large and Node Red. This might be an easier way of reading the SOC, making a decision and switching the inverter on and off. Especially if your development skills are lacking.

but for me the easiest way to start.

get the SoC - run

write the register - run

but no knowhow how can I shrink the scrip for do only what I need.