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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This guide covers series vs parallel fundamentals, string sizing math with worked examples, NEC 690. 7 temperature derating, mismatch rules, shade-aware strategies, DC wiring requirements, and how solar design software handles all of this automatically.
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Determine how many batteries you need in series, parallel, or both to meet your system voltage and capacity requirements. This calculator shows the required arrangement to match your target system.
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A series connection links the positive terminal of one battery to the negative terminal of the next, increasing total voltage while keeping capacity constant.
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