When I bought our RV build in 1979 it had a few shore powered sockets. A 90AH lead-acid batterie and lots of weird wires. After the first holiday it was clear we want it to be fully independent.
Searching for a inverter i found the Victron Multiplus and it was clear, thats what i want.
So it started with the Multi and off course a bigger batterie. Soon it was clear i want to monitor that. As we wanted it independent it also got PV panels.
Actually it contains the following
MultiPlus Compact 12/1200/50
Victron AGM 165Ah
MPPT 75/15
Cyrix CT to connect the alternator or charge the starter
2 120 WP panels
BMV 702 also monitoring the starter voltage
Color Control GX
Installed all that learning by doing. Runs for many years now.
At the moment I am planing an upgrade to Lithium NG batteries and more PV.