Connecting multiple batteries in a parallel configuration involves linking all positive terminals together and all negative terminals together. This arrangement effectively creates a single battery with a voltage equal to that of the individual batteries but with a higher overall capacity, measured in amp-hours (Ah). For example, connecting two 12-volt batteries in this manner results in a 12-volt power source with double the amp-hour capacity of a single battery.
The primary advantage of employing this wiring method lies in its ability to extend the runtime of devices or systems powered by batteries. This approach is beneficial in applications where increased power demands or prolonged operational periods are necessary, such as in recreational vehicles, solar power storage systems, and marine equipment. Historically, parallel battery configurations have been utilized to provide reliable and extended power in off-grid scenarios and mobile applications where access to conventional power sources is limited.