How To Connect Battery Bank?

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Battery Bank always refer to a group of batteries that wired together in Series or Parallel circuit.

Series circuit wiring is made by connecting one pair of opposite terminals of different batteries together as per shown at the diagram. Series circuit wiring practically will increase the total voltages of the batteries but on the other hand, the amperage capacity still remains the same.

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The below diagram is a string of 4 batteries connected in Series wiring. Each battery is 6V with rated 250AH capacity, thus the nominal voltage of this string is 24V with remain of 250AH capacity.

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Parallel circuit wiring whereby is made by wiring with 2 or more same terminal batteries together (usually positive to positive terminal and negative to negative terminals). A Parallel wiring on the other hand can increase the amperage of the string batteries increase while keeping the total voltage the same as one of the batteries.
Series circuit wiring practically will increase the total voltages of the batteries but on the other hand, the amperage capacity still remains the same.

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The diagram shows two 12V batteries rated 350AH each are wiring in parallel circuit. Thus the total voltage of these string batteries is remain in 12V with a AH capacity of 700AH.

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Combination of Series and Parallel wiring circuit

Battery Banks often also is connected together by using both Series and Parallel circuit as per diagram shown below. Each battery is in 6V with 250AH capacity, then each string has a voltage of 24V (4 batteries with 6V) and 250AH. The two series strings are then wired in parallel which can increase the amperage capacity to 500AH.

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It is important to make sure the voltage of your inverter and charge controller must same as your batteries bank voltage whether 12v, 24v or 48v.