[Hippocrates_Garden]

sounds easy, but there area a whole lot of “it depends” in there. Everything from maintaining the batteries, using “car batteries” inside the house (off-gassing, potentially explosive gasses), and a lot more.
To be honest, if using components, it needs to be tailored to the specific end use. under sizing can cause as many problems as oversizing.

Without more specific information about what you’re trying to accomplish, it’s hard to give any constructive criticism. Is this something that is dropped off during an emergency for a short period of time, something that would be in the house for unspecified lengths of time, what is it intended to power and for how long, under what circumstances (a cpap used only at night is quite a different story from an oxygen generator that needs to run 24/7 and more).

Wind is only worth it in specific areas.

The best solution, depends on the proposed end use.. simplest, easiest to use and support etc, might be a bulk order of say Anker power stations and solar panels (if the location and weather makes that even useful).