Off-Grid Winter Dark-Doldrums (Dunkelflaute) Battery vs Auto-Genstart Sizer

Deterministic Worst-7-day historical POA irradiance streak (PVGIS TMY) Monte-Carlo SoC simulation + LCOE battery-vs-fuel frontier engine (.csv, .pdf, .json) built for Victron Cerbo GX, Pylontech, Honda, Studer — zero-upload ephemeral Wasm RAM execution.

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