The AC combiner box is a key equipment used in photovoltaic power generation systems to collect, distribute, and control the output of AC power from inverters, ensuring the safe connection of electrical energy to the grid or load.
Electricity Collection and Distribution
Integrate the AC current output from multiple inverters (such as 4-in-1-out, 6-in-1-out, etc.), and transmit it to the power grid through copper bars or cables after convergence.
As a centralized disconnection point for inverter output, it facilitates system maintenance and fault isolation.
Multiple Security Protections
Short circuit/overload protection: equipped with molded case circuit breakers (such as 100A input circuit breakers, 350A output circuit breakers) to quickly cut off fault currents;
Lightning protection: Built in surge protector (SPD), specifications must meet Uc ≥ 750V, Imax ≥ 40kA (such as Up ≤ 2.6kV), and the grounding terminal must be forcibly connected;
Anti islanding protection: Automatically disconnect the inverter output when the power grid is cut off, avoiding the harm of reverse power supply to maintenance personnel;
Anti backflow control: Monitor the direction of current to prevent residual photovoltaic electricity from flowing back into the grid (in accordance with GB/T 38946-2020).
Distributed rooftop photovoltaics (commercial/residential);
Ground power station string inverter cluster output terminal.
