Like I said in a couple of other posts, it’s a lifestyle not necessarily a ROI decision...
If you live in a rural remote location, you will have to provide most of your own public utilities, like water and sewage, but based on experience dealing with the aftermath of a hurricane, living remotely means you are the last to get power back....
Building a house with solar in mind from the beginning is the optimal way to go...because you can build a structure around the solar system....
If I were to build a new house, in Florida, so results will vary...but I would build the following...
A modest size home no more than 2000 to 2200 Sq. Ft...
The house would be built using Insulated Concrete Forms (ICF), energy efficient windows an doors, a Tin SIP paneled roof and finally to the extent possible Gas Appliances...the goal would be to make the house as energy efficient as possible to lessen to demand for electricity...for example, ICF construction is supposedly 70% more efficient than a traditionally framed house...
the other design I would use is mini-split AC units instead of central heat and air..
Our farm house in Indiana is off grid with 360 watts of solar panels charging a 600 amp hour battery pack. The system is perfectly adequate for a retired farm couple; but it’s kind of a pain in the ass and wouldn’t be suitable for someone without a lot of time on their hands.
Sounds like a solid design.
L