In a series connection, the positive terminal of one solar panel is connected to the negative terminal of the next — much like joining them head to tail in a chain.
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For lithium-ion packs, a series circuit connects cells end-to-end so voltages add while current rating stays equal to one cell, whereas a parallel circuit ties all positives together and all negatives together so capacity and current rating add while voltage stays at one.
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The right battery configuration for you depends on the energy needs of your device and your own. Here's a quick look at how each type of connection works: Series Connection = Voltage Adds Up, Capacity Stays the Same.
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To wire solar panels in series, connect the positive cable of one to the negative cable of the other.
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