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Series-Parallel Connections
As the name series-parallel implies, both the series and parallel configurations are
used in combination. The result is an increase in both the voltage and the capacity
of the total battery bank. This is common with all battery-inverter system
voltages. The smaller, lower voltage batteries are first connected in series to
obtain the necessary voltage, and then these “batteries connected in series” sets
are connected in parallel to increase the battery bank capacity. See Figure 18.
Figure 18
Batteries in Series-Parallel Connections