Renogy Off-Grid Kit, General Manual

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9.2 Parallel connection of batteries (12V)
Figure 9.2 Two 12V batteries connected in parallel
When two or more batteries are connected in parallel, their voltage remains the same but the
Amp-hour ratings add up.
Fig. 9.2
shows two 12V batteries in parallel forming a “bank”. For
example, say each battery has 100 Ah. When connected in parallel they will form a battery bank
of 12V with a capacity of 200 Ah. Notice that the cables connecting the batteries in 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.
The negative cable from the controller to the battery should be placed at the opposite end of the
battery bank.
Figure 9.2 shows this connection.