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$22,000 would pay my electric bills for about 12 years, not even factoring in opportunity cost. What are the ongoing maintenance costs/total cost of ownership over 12 years of such a system?

As far as Powerwalls go, I'd definitely want something like that in an outbuilding and not in my house. Last thing I want to do is wake up at 3:00am with a raging battery fire in my basement.

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If we're talking about nerds buying this stuff, $22k is comparable to what people spend on nice homelab setups. I would pay $22k just because it's cool and not because it saves money.

Yeah, but we're talking about 0.1% of the population. For mass adoption, prices have to be much, much lower.

There's some places where you can't put the Powerwalls indoors. In CT where I live it's just fine. I did add in a fire suppression system in my basement when I had them installed. This was not a requirement and was included in my overall cost figure provided. It's a big red thingy in between the rafters that goes "boom" when there's a fire. That's a technical term.

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