In the illustration, 1, 2, 3 and 4 are 12 volt batteries. What will be the nominal voltage as read by a voltmeter across the output of the battery bank? Illustration EL-0107

Correct Answer: Option C — 24 volts

Series-parallel battery bank configurations double the voltage while maintaining individual amp-hour capacities. Two pairs of 12-volt batteries connected in series create 24-volt branches, which in parallel yield a nominal 24-volt output per standard IEEE 45 marine DC system principles.