The problem with solar cells, is they have a half life ranging between 10 and 20 years. That means their output drops 50% every 10 or 20 years.
However, they will last longer than the 200 gallons of LPG powering my standby generator.
The other problem is that they are composed in part from gallium arsenide, a nasty toxin, so disposal is problematic.
There is no easy solution. The best solution is going Amish, because they rely the least on technology.
For those of us who are older, that’s not going to happen.
The outlook, especially for seniors and city dwellers, is very gloomy.
Basically everything producing enough energy for civilization will eventually have to have civilization to keep it going.
I’d say move to like minded communities where people can work together on the maintenance of a modern lifestyle.
Have you ever looked at woodgas as a backup fuel for your generator? That would let you use it even if LPG wasn’t available.
(Despite the name, woodgas can be made from other burnable materials, such as rice hulls or corn cobs.)