This is a Hassio addon to control voltronic axpert inverters through USB and MQTT
I have 3 inverters in parallel and a raspberry connected to 1 of them with a USB cable . Linux doesn't seem to recognize it as a USB to Serial device and it only shows up as /dev/hidraw0.
A description of the serial communication protocol can be found here
Add https://github.com/MindFreeze/home-assistant-addons to the addon store repositories and you will get a Axpert Command listed there.
Note that this assumes the inverter is /dev/hidraw0. If you have other USB to Serial devices connected this might be wrong.