✗ What flat-rate tools miss
- · The cheap overnight window — where battery savings actually live
- · Battery fade (2 %/yr) — inflates lifetime savings by 25–40 %
- · Panel output drop (0.5 %/yr) — year-25 figure is fiction
- · Tariff inflation over 25 years — dwarfs the modelled saving
- · Controller capability — Predbat ≠ Tesla Energy Plan