Because it is big power and not DIY level thing it is best to work through the main sales a distribution centre
So do that.
https://www.victronenergy.com/where-to-buy?continentid=1
The forum is not a place for design either. Especially not at this scale.
Many of your questions are already covered in the manual
The microgrid is not AC PV ready in any case. It is recommended to use DC PV for each bank separately. And they don’t share power over the bus.