What configuration of storage batteries results in a total current capacity that equals the sum of each battery's capacity?

The parallel connection of storage batteries is the correct configuration that results in a total current capacity equal to the sum of each battery's individual capacity. In a parallel setup, the positive terminals of all batteries are connected together, and the same goes for the negative terminals. This arrangement allows each battery to contribute its full current capacity to the load.

For example, if three batteries each have a capacity of 100 amp-hours and are connected in parallel, the overall current capacity of the system will be 300 amp-hours. Each battery can deliver its maximum current simultaneously, thus increasing the total current capability while maintaining the same voltage output as a single battery.

In contrast, a series connection would increase the overall voltage while keeping the current capacity limited to that of the weakest battery in the series. Thus, while the voltage adds up, the total current capacity does not reflect the individual battery capacities collectively.