In a heavy vehicle whose starter motor runs at 24 volts, how must two 12-volt batteries be connected to reach that voltage?

Question

DentroTest · Accepted Answer

To raise the total electrical voltage while keeping two batteries, a series connection is needed. Connecting in series means linking the positive (+) terminal of one battery to the negative (-) terminal of the other; in this way the individual voltages add up (12 V 12 V = 24 V), while the capacity in ampere-hours (Ah) stays constant. By contrast, joining positive to positive and negative to negative would be a parallel connection, which keeps the voltage at 12 V and adds up the capacity, which is insufficient to power a starter motor designed for 24 V.

In a heavy vehicle whose starter motor runs at 24 volts, how must two 12-volt batteries be connected to reach that voltage?

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