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The HTW Berlin has a autarchy calculator. Unfortunately only in German language: https://solar.htw-berlin.de/rechner/unabhaengigkeitsrechner/

They also test and publish yearly the latest battery combos.

Extremely underrated how important just a small battery is for autarchy, very useful site.

The calculator makes it very clear that adding more batteries becomes more and more inefficient.

Being 100% independent is just completely unnecessary.