The parallel combination A and B is in series with the parallel combination C and D. Again, the total battery pack voltage is 24 volts and that the total battery pack capacity is 40 amp-hours.
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Use Series Configuration if you need a higher voltage for motors, power tools, or other high-power applications.
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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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To connect two or more solar panels and batteries in parallel, simply connect the positive terminal of one panel or battery to the positive terminal of the other, and the negative terminal to the negative terminal, as shown in the diagram below.
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