PV Grid-Tied Box

The PV grid-tied box (also known as a PV grid-connected junction box) is a compact core device for achieving low-voltage grid connection in distributed photovoltaic power generation systems, interfacing between the AC output side of the inverter and the grid service entrance. The equipment typically features a powder-coated cold-rolled steel or engineering plastic enclosure with a protection rating of IP54 or above. It is internally equipped with core components including AC circuit breakers, disconnector switches, surge protective devices (SPDs), energy meters, grounding terminals, and terminal blocks. It can complete key functions such as AC wiring conversion, overload/short-circuit protection, lightning grounding, and energy metering. Some models integrate simple monitoring modules or reserve RS485 communication interfaces, adapting to low-voltage grid-tied levels of AC 220V/380V and outdoor/indoor environments ranging from –25°C to +65°C. With a compact structure and easy installation, it can effectively standardize grid connection wiring, ensure safe isolation between distributed PV systems and the utility grid, and guarantee compliant grid connection. It is widely applied in the final grid-connection stages of small-scale PV projects, such as residential PV and distributed PV on commercial and industrial (C&I) roofs.