Its interesting, but doesn't seem very practical. A giant vat full of sulfuric acid and vanadium salts, and the cheapest one is 100k. What happens if
one leaks? Maybe if the technology improves it will happen, but I don't think it will any time soon. Around here people who are completely solar
(cabins, summer homes), usually store the power in a bank of lead acid batteries. While maybe not as efficient it is a lot cheaper than 100k.
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