What you say is true for a small system but not for a large system.
It's best to have a large solar panel array AND and large LiFePO4 battery bank...AND run efficient items like the solar refrigerators/freezers I got, they are energy stingy.
Build your system so that you can get by even if EVERY day from now on will be overcast... you only get 10-20% of your panel rating in such conditions and only for perhaps 6hrs a day at most so OVERBUILD. 20kw of panels will give you 2-4kw for 4-6hrs a day 20kw of panels are selling for roughly 12,000 dollars currently (Amazon) 100kw of panels for roughly 60,000.. Of course you need to live on a farm or something to put out so many panels.. I have 40 acres.
If you don't build for the worst possible case of every day being overcast you will be disappointed with your results.
And if you get clear bright days an overbuilt system can really get you some power... say 20kw+ on a bright day, you can run a clothes dryer during such times... but I'd still rather store the extra and hang the clothes out :-)
Be aware that the copper wiring for a large system is pretty costly.. 2 aught copper ain't cheap and it's best to run a 48VDC system so you can use smaller/cheaper wiring :-/
Also get enough AC charge capability so if your power from the grid is intermittent you can top up your battery bank... but don't depend on that, again.. OVERBUILD!
These are the panels I am now buying to put in storage.. unconnected in case of EMP, they should survive if not connected to wiring... I have diodes to replace those if the ones on the panel were to blow.
I have about 100 of these and more coming... here they are, it's a good buy for 100watt 9bb monocrystalline panels with free shipping.
If you are going big go commercial grade panels even at retail prices by the pallet they are 2/3 the cost of Amazon.
https://sungoldpower.com/collections/solar-panel/products/450w-mono-perc-solar-panel-full-pallet-32-panels
Get someone with a TIN number and get wholesale price by the pallet worth. Half of the retail price point on a minimum two pallet order that’s 64 panels for around six grand. That’s 20 cents per watt with a25 year 80 cap life. 64 panels is a 28.8 kilowatt system and will power a HUGE home with dual A.C. Units roaring. Those panels are 75”*44” or 2.12 square meters no small coincidence as the 120 cells have an’m exactly 2 square meters area. If you laid them flat you won’t those 64 panels cover ~136 square meters or 1463 sq freedom units. Those panels will be tilted at an angle roughly equal to the latitude of instal. No need for acreage at all a fairly large home would already have the roof area facing south if not then cover the back yard deck, 3 car garage as well. Now you have a large system that even on overcast days are gonna put out 10 to 30% rates capacity. No need for copper wires outside you use aluminum wire just like every other commercial installation does.
You series wire your panels into groups of 8 for a working 277VDC at 13 amps or 3600 watt groups. 64 panels gives you eight groups. This is direct buried cable no conduct needed above or below ground. Cheap too and 50 amp @600V
https://nassaunationalcable.com/products/8-duplex
You run them need eight 277vdc input 4000 watt pure sine inverters that will output either 3 phase (240/400)/50hz or split phase (120/240)/60Hz for the Americans. Here again with a TIN number those are in the 20 cents per watt capex.
Do the install with subcontractor labor and only use a licenced electrician for the breaker tie in and inverter to breaker connections. Your all in cost should be under 25 grand. You then have a full off grid capable power supply if you want to add in powerwalls Tesla will be happy to sell you some.
You are assuming that nothing will break and need replacement parts that will not be available. It doesn’t work this way. I have had lightning EMP ruin brand new inverters in the box not even hooked up just because it hit too close. Reality is the more moving parts the higher chance of failure. In which case it is then all just boat anchors. Then you are right back to zero anyhow.
Reducing dependency and learning to live minimal is the smarter option in the long run. Been there...