Very cool, if true

Depends what you think might happen with prices (and supply security, if such things concern you). 20 yr "payback" - is that allowing for inflation eating at the capital sum if you have it but DON'T spend it now? Also even if that is priced in, it genuinely could make sense if you have the money now but will not later (e.g. retirement or some such quaint notion). Except most systems won't last 20 yrs, and batteries have as max 10yr lifespan. Else I'd be thinking of solar adding to the property value.

As it is, I know in Denmark, most people are actually scrapping their older solar systems. Denmark now forces you to sell to the grid at wholesale price and buy back at consumer price. Needless to say, the differential is huge.bYou are not allowed to directly use the power you generate. So it makes no sense at all any more on a domestic level (esp if there are any maintenance costs at all).

The co. I work for do a "lease to own" 20 yr deal where they sort everything (including if a battery makes sense or not). Basically, you swap your electricity bill for a (almost certainly fixed interest) loan. I guess most people must save. For me right now it'd have to cost less than ... oooh roughly 15k for a loan to be cheaper than my elec bill. I don't think I can get much for that!