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Old 09-09-19, 05:13 AM   #4
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I've heard of them, also called Edison batteries. One has been functional for over one hundred years at a college (can't remember which one). They are waiting for it to fail to take it apart and see how it works.
An iron battery could be the perfect match to a small solar install as they don't hold a charge well or have a strong discharge but are cheap and last indefinitely.
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