An Array Junction Box (AJB) also known as Combiner Box is the equipment to combine the DC voltage generated from a number of solar photovoltaic panels. It serves as a central point where multiple solar panel strings are connected and consolidated into a single output. This allows for efficient management, protection, and monitoring of the solar array.

AJBs typically contain features such as overcurrent protection, surge protection, and sometimes monitoring equipment to ensure optimal performance and safety of the solar power system.