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Salt is everywhere and costs almost nothing, and yet there is no sodium battery on your wall. This is the full dossier behind the video: why the year 2027 comes from trade blogs rather than research, what 'parity' actually means in the only peer-reviewed study on the question, and how one expired mining permit in Jiangxi flipped the headlines in four trading days without anything changing about sodium.
A hundred kilowatt-hours go in. Eighty-five come out. Those fifteen did not disappear. This is the full route one kilowatt-hour takes from your roof to your kettle, with the arithmetic included: why a solar panel cannot produce anything but DC, why a plug-in battery sits at 48 volts while a fixed installation does not, and the four places where that fifteen percent leaves as heat.
