Smart PV DC/AC Combiner Box

The PV DC combiner box is a core intermediate device in photovoltaic power generation systems that connects PV modules and inverters. It typically features an enclosure made of powder-coated steel or stainless steel with an IP54 or higher protection rating, accommodating 2-24 strings of DC input from PV arrays. Through internal core components such as PV-specific DC fuses, anti-reverse diodes, and high-voltage surge arresters, it achieves multi-string current combining, branch short-circuit protection, anti-circulation, and lightning protection. Some models are equipped with intelligent monitoring modules that collect real-time data on branch currents, voltages, and device status, transmitting via RS485 interface. This effectively simplifies wiring complexity between PV modules and inverters, reduces the scope of fault impact, and supports ambient temperatures from -35°C to +75°C and operating voltages of DC1000V/1500V. It is widely used in large-scale PV power plants and distributed PV projects, ensuring safe and stable system operation.
The AC combiner box is a key power distribution device in photovoltaic systems that connects inverters to grid-connected cabinets (or transformers). It typically features a powder-coated steel or stainless steel enclosure with an IP54 or higher protection rating, accommodating multiple AC inputs from inverters (commonly 3-16 circuits). Through internal core components such as AC circuit breakers, disconnectors, surge protective devices (SPDs), and grounding terminals, it achieves multi-circuit AC power combining, distribution, overload/short-circuit protection, and lightning/grounding functions. Some models integrate intelligent monitoring modules that collect real-time data on branch currents, voltages, power, and switch status, transmitting via RS485 interface (Modbus RTU protocol). It supports common grid-connected voltages such as AC380V/400V and ambient temperatures from -30°C to +70°C, effectively simplifying the wiring architecture between inverters and downstream equipment, reducing system losses, and limiting fault impact. It is widely used in AC-side power distribution of large-scale PV plants, distributed PV projects, and energy storage systems, ensuring stable grid-connected power transmission.