>but with batteries like these it's going to be cheaper than fossils for overnight usage too.

1200eur bought me a reasonable LiPo solar 'buffer battery' for evenings, and ROI is maybe 3 years vs buying fosil fuel electrons at peak tarif. Plus savings from being able to drop the fixed ~70% of my bill grid connection charge.

Anyway, exciting to see that I might soon be able to afford enough storage for cloudy days too. Thanks for the extra details, sounds too good to be true.