To wire lithium batteries in series to increase voltage, connect the positive terminal of one battery to the negative terminal of the next. This setup means the voltage of each battery adds up, giving you the higher voltage you need for your project, but the amp-hour rating stays the same. [pdf]
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The average fan wattage is 33W. Also, 220W was the highest fan wattage documented in the study. This page describes what a solar-powered fan is, how it works, and the comparisons between a solar-powered fan and a solar generator for a fan. [pdf]
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