90kwh/day are way to much to support. In a SHFT you should eyeball for about 5-10kwh per person per day to live in comfort.
Everything above that is unnecessary luxury.
Although production, even of 90 kWh/day, is feasible. Battery storage is the least economical and shortest lived (unless you go out of your way to buy electronics that will fail quickly.) Refrigeration and water would be among the fairly critical applications, but not good if an electric well pump is the only way to get water.
You can reasonably purchase 5kW to 20kW of panels.
These do have degradation mechanisms, including due to exposure to light, voltage bias (cells either positive or negative relative to frame may be worse depending on cell type), moisture. In a normal world we would buy the array we want and maybe a few spares. For TEOTWAWKI, you could keep a second array stored in a dry location out of the light. Good panels should last 25 to 40 years with some degradation, but many do not.
Electronics can die in a very short time or last 10, 20, 30 years. Heat, temperature cycling, and voltage bias contribute to wear-out. Electrolytic capacitors dry out. Many parts area heated by the I^2, the square of current, so running near full power shortens life of what would otherwise be longest lasting parts. Something like each 10 degree increase in junction temperature cuts life in half. Quality electronics can give long life, but take note if they start running hotter due to plugged air inlets or fan failure.
Batteries, we know some lead-acid have about 10 year life and some 20 year with shallow cycling. Various lithium we hope for 10 to 30 year life but don't have the track record yet. Plenty of experience with short life probably due to being kept 100% charged in warm conditions.
If the electronics supports it, you can have AC power while there is sunshine without batteries. That could be useful especially for refrigeration.