Charging x12 230ah AGM batteries in the winter

Also, how do I get in the victron windows based page.
I’m only currently on victron connect ?

You may be better off downloading the VE-bus tools from
https://www.victronenergy.com/Executables/VEConfig/VECSetup_B.exe
This makes it easy to check the inverter configuration and access the logs.
you can update the inverter firmware from Connect, just click update device and follow the steps.
You can also use VE configure on a laptop to monitor the generator volt & frequency while it is connected, or trying to connect. The VE-configure tool also allows you to configure the max generator current and battery charge current.

Please, read this…
https://www.victronenergy.com/live/multiplus_faq