The problem with the grid parity link is this,
To satisfy your personal peak power, your going to have to reduce it via smart home appliances or by selling power back to the grid or storing it, or some combination of the three. The first and third cost money (the third, at least 10 cents per kilowatt), and the second you get less than half the money for sending power into the grid than you buy it for. (No way a residential investment that produces more than you can immediately use or store and use later will have parity)
Now if the grid goes out and you don't have storage, how to you run your heat pump at night when you actually need it the most?
Forth the power rating are for ideal conditions, and actual power decreases linearly with time after 25 years you've lost between 17 and 28 % of the efficiency. Oh did you climb up on the roof and wash your panels every week? If not knock some more off.
The point being even under idea conditions solar barely makes sense as to run at a wattage equal to your base load, much less a backup. an entire house, unless it is earthship-esque with minimal total demand for electricity, in which case, WTF are you doing on the grid anyways?