@hertfordnc I would consider a separate, smaller portion of your home be retrofitted with an AC/DC Mini Split (or splits) to cool critical rooms. These AC/DC mini splits can be operated in day light hours with NO AC line input at all. Just 3-6 solar panels direct. But can also be wired AC for night time use.
This is easier than trying to build a complete system that will run your existing AC unit off grid. and then any off-grid system you build does not have to be so large only powering lights fans and even refrigerators.
Benefits of an AC/DC direct solar Heat Pump solution
- smaller off grid set up
- can run on solar only
- can be used in tandem with existing AC, but on solar for lower power bills
- A combo small off grid system + AC/DC solar input mini spilt could be less than a large off grid system that powers existing AC
Just a thought.