That’s not the type of batteries the poster was referring to nor was there any mention of a solar system with the batteries.
It was just batteries. The kind of batteries you would pick up at Wally World while you are waiting to check out.
Believe it or not, very few people actually have a “solar system” or any other “alternate energy source” to run all their electrical gadgets on so their life would be just as normal after the electricity went off as it was before.
Even a stand-by gen. has it’s limitations, even a whole house system, because sooner or later you run out of fuel.
Now before some idiot wants to tell me “their” system is connected to the city gas line so they wont run out of fuel, surprise, that gas service would shut down.
I've built one. They work.
/johnny
Batteries can also be maintained by an inverter/charger, much like a live aboard boat. Many people that work at home with computers have such systems that can run for a day or two.