Thats good info and sounds very reasonable.
Do you plan on having 2 different solar systems, one for 12V and one for 24V?
Or charge 12V from 24V with a B2B charger? (i like this idea)
The only gotcha is that value priced AIO's use a LOT of standby power.
If you are in this for the long haul and want years of reliable solar power, now is the time to invest in quality equipment, whether its AIO or separate SCC and inverter). With that big generator on back (or is that a margarita machine?), an AIO that accepts generator (and shore power?) would be clean.
If you have the budget and want carefree power and 5yr warranty, something nice like: