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71
9.3 Series – Parallel connection of batteries (12V)
Figure 9.3 Four 6V batteries connected in series – parallel
Fig. 9.3 shows two strings in parallel; each string consists of two 6V batteries in series. For
example, say each battery has 225 Ah. Each string would have a voltage of 12V with a capacity
of 225 Ah. When these strings are paralleled, the total capacity of the battery bank will be 12V at
450Ah. Notice that the cables connecting the batteries in series and parallel are of heavier gauge
than the ones coming from the controller. These cables have to be of heavier gauge because
when power is drawn from an inverter, it involves large amounts of current. This interconnection
cable is often sized according to the power of the inverter.
Also, the negative cable from the controller to the battery should be placed at the opposite end of
the battery bank. Figure 9.3 shows this connection.
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