SaRoqueta

I have quite some experience with voltronic inverter serial commands.
Do you have logs from this specific commands that do not work anymore? Especially the reply from the inverter side would be interresting.
Voltronic sometimes adds new parameters for some commands in new sw versions. Most of them are often undocumented and you need to fine out their meaning the hard way. If you have a fw uprade for your new inverter, you might be able to find out new parameters by disassambling the binary.
Another way to get the information is to trace the serial port while you set the parameters with watchpower.

If you have SolarPower to configure your new inverter, you can use SolarPower's debug mode.
I made a little howto and posted it here. It's in german language, but g**gle translator is your friend.
Just activate it (solarpower needs to be started as windows admin!) and change the setting you want (ac charigng amps, etc.) and note the exact timestamps you executed the changes. Then grab the logfile and post it here.
Keep in mind to use a actual version of solarpower. Just uploaded latest version 1.22.SP7 for you here.