Renogy Off-Grid Kit, General Manual

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9.4 Series connection of batteries (24V)
Figure 9.4 Two 12V batteries connected in series
Wiring two 12V batteries in series as shown in Fig 9.4 will result in a 24V system. The same idea
applies if you place four 6V batteries in series ( Fig 9.5 ). Remember that when batteries are in
series, the voltages add, but the total capacity of a string of batteries stays the same. For example,
if two 12V batteries with 150Ah rating are wired in series, the resulting system would be 24V at
150Ah.
Because of this, it is mandatory that the batteries are identical when they are wired
in series.
Figure 9.5 Four 6V batteries connected in series