How to Wire Two 12 Volt Batteries to Make 24 Volts | Sciencing Use 12-volt batteries to run a 12-volt and 24-volt devices. For example, a boat may have a 12-volt starter for the main engine and a 24-volt trolling motor. By wiring a pair of 12 volt batteries in series, you can use the same batteries to perform two different tasks. As with any trial.. How Do You Wire Two 12-Volt Batteries to Make 24 Volts wwwrence›ElectricalHow Do You Wire Two 12-Volt Batteries to Make 24 Volts? Connecting two 12-volt batteries in series adds their individual voltages together to create a 24-volt battery pack. The series arrangement does not increase the capacity of the batteries.
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