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73
9.5 Series-Parallel connection of batteries (24V)
Figure 9.6 Four 12V batteries connected in series – parallel
Multiple strings of batteries can be wired in parallel to increase the capacity. Figure 9.6 shows a
battery bank with two strings of batteries. Each string consists of two 12V batteries in series. For
example, if wiring four 12V/150Ah batteries like as shown in Figure 9.6, then each string will have
a total capacity of 24V/150Ah. By paralleling these strings, the total capacity would be 24V/300Ah.
Because of this, it is mandatory that the batteries are identical.
Each parallel string can also consist of 4x6V batteries to make 24V per string as shown in Figure
9.5. Remember that the negative cable from the controller to the battery should be placed at the
opposite end of the battery bank.
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