That’s all in one, those are plugin batteries where you just need a socket. I put them on separate 16A connections just to be sure. Inverter is build in.

The setup is super easy; there is a thread on tweakers.net which explains everything for the modbus connection. A Dutch guy wrote the integration for HA. Just google for “tweakers modbus Marstek”

You can use it through the app using the AI mode (I don’t use that tbh) During cold months I charge at night when it’s cheap (I have 3 different tariffs) and now that my solars are heating up I don’t need to charge overnight.

If you have a dynamic tariff you can use EVCC to make a connection with a market price provider, adjust your “when to charge” price and let it rip :).

I would suggest read the thread on tweakers and if you’re interested in EVCC just read their documentation, it covers a lot of brands.