In a large solar photovoltaic (PV) array, multiple solar modules are connected in series in a string to build the voltage up to proper levels for the inverter. Multiple strings of solar modules are then combined together in parallel to multiply the string output currents to higher levels for input into the inverter.
The combiner box is a device that combines the output of multiple strings of PV modules for connection to the inverter. It is typically used in the larger commercial and utility scale PV power plants. The combiner box commonly houses the input overcurrent protection fuse assemblies for several strings, as well as the combined bus of those inputs into a single main output. Combiner box may also house several other components for the site, such as a DC disconnect, surge protective devices(SPD) and, in some cases, string monitoring hardware for SCADA system.

In a large solar photovoltaic (PV) array, multiple solar modules are connected in series in a string to build the voltage up to proper levels for the inverter. Multiple strings of solar modules are then combined together in parallel to multiply the string output currents to higher levels for input into the inverter.
The combiner box is a device that combines the output of multiple strings of PV modules for connection to the inverter. It is typically used in the larger commercial and utility scale PV power plants. The combiner box commonly houses the input overcurrent protection fuse assemblies for several strings, as well as the combined bus of those inputs into a single main output. Combiner box may also house several other components for the site, such as a DC disconnect, surge protective devices(SPD) and, in some cases, string monitoring hardware for SCADA system.