PV Grid-Connected Box

The PV grid-connected box (also known as PV grid-connected junction box) is a compact core device for low-voltage grid connection in distributed PV power generation systems. It connects the AC output of the inverter to the grid entry point. Typically, it features a cold-rolled steel sheet with plastic spraying or engineering plastic enclosure with an IP rating of IP54 or higher, and incorporates key components such as AC circuit breakers, disconnectors, surge protective devices (SPDs), energy meters, grounding terminals, and terminal blocks. It performs essential functions including AC wiring conversion, overload/short-circuit protection, lightning and grounding protection, and energy metering. Some units integrate simple monitoring modules or reserve RS485 communication interfaces. It is compatible with low-voltage grid connection levels of AC220V/380V and outdoor/indoor environments of -25°C to +65°C. With a compact structure and easy installation, it effectively standardizes grid connection wiring, ensures safe isolation between the distributed PV system and the utility grid, and enables compliant grid connection. It is widely used in small-scale PV projects such as residential PV and commercial/industrial rooftop distributed PV at the grid connection endpoint.