An array junction box is a specialized type of junction box used in photovoltaic (solar) power systems. It serves as a central point where multiple solar panels are connected to one another and to the rest of the electrical system.

• Terminal Blocks: These are used for connecting the wires from the solar panels together and for connecting them to the cables that lead to the inverter or charge controller.
• Diodes: Diodes are often integrated into array junction boxes to prevent reverse current flow, ensuring that electricity generated by the solar panels flows in the correct direction.
• Fuse Holders: Fuse holders are included for each string of solar panels to provide overcurrent protection in case of a fault or short circuit.
• Enclosure: The enclosure houses all the components of the array junction box, protecting them from environmental factors such as moisture, dust, and temperature extremes.

• Series Connection: Array junction boxes allow for the series connection of multiple solar panels, enabling the combined voltage output of the panels to be directed to the inverter or charge controller.
• Parallel Connection: In addition to series connection, some array junction boxes also facilitate parallel connection of strings of solar panels. This allows for increased current output while maintaining the voltage level.
• Overcurrent Protection: The fuse holders or circuit breakers included in the array junction box provide protection against overcurrent conditions, ensuring the safety of the solar panel array and associated components.
• Diode Protection: Diodes prevent reverse current flow, which can occur when solar panels are shaded or when there is insufficient sunlight. This protects the solar panels from damage and ensures optimal performance

Array junction boxes play a crucial role in solar power systems by facilitating the efficient and safe connection of solar panels, ensuring maximum energy harvest and system reliability.