True. My parents actually have their apartment wired for "power groups that can run on inverter" and other power groups that will be without backup. Their power needs are substantially lower than an average American and European household. That is why I was wondering if this idea could be _scaled_ up.

I would not go around recommending anyone to buy Lead acid battery banks today. I'm in the midst of getting rid of the ones at my parents' too.

However, I found these LFP batteries where I live - NL for about 1K Euros [1] . They are 2.5KWh. Two or three of them and an inverter ought to be a good as reasonable backup for an American house dont you think? LFP batteries dont catch fire like the Li-Ion ones tend to. No worries about oil maintenance. They come with 10 years of warranty. What is a downside to this that I am missing?

[1] - https://greencell.global/en/lifepo4-batteries/4097-lifepo4-b...