Since photovoltaic combiner boxesare installed in outdoor environments, it is necessary to consider lightning protection for these boxes. For this purpose, a photovoltaic DC-specific lightning surge protector (i.e., lightning arrester) is paralleled at the DC output part of the combiner box.
The combiner box is a complete installation in the photovoltaic power generation system that ensures orderly connection and collection of photovoltaic string arrays. It is generally equipped with surge protectors, residual current devices, isolator switches, circuit breakers, etc., providing isolation, leakage, and grounding protection. This ensures that the photovoltaic system can easily disconnect the circuit for maintenance or inspection and reduces the extent of power outages when faults occur, thereby enhancing the performance of the photovoltaic system.
An AC combiner box is a crucial part that carries the output of string inverter arrays to the AC side electrical cabinet or to the input of a step-up transformer. It collects the AC output of multiple inverters and then outputs it, greatly simplifying the connection between string inverters and the AC distribution cabinet or step-up transformer. The integration of an AC combiner box, serving as a disconnect point for the inverter output, also protects the inverter from hazards originating from the AC grid, increasing system safety and safeguarding maintenance personnel.
DC combiner boxes are commonly used in medium to large photovoltaic power systems. Users connect a certain number of photovoltaic modules of the same specification in series to form photovoltaic arrays, and then several of these arrays are paralleled into the photovoltaic combiner box. This arrangement not only organizes the cables neatly but also facilitates group inspection and maintenance. When part of a photovoltaic module array experiences issues, it can be isolated for repair without affecting the overall power generation system’s connection.
ONCCY combiner boxes are made of engineering plastics, featuring an aesthetically pleasing, robust, and durable design, and simple installation. With a protection level reaching IP65 or higher, they are waterproof, dustproof, and suitable for long-term outdoor use. The internal components can be customized according to user requirements, offering a variety of types from 2 to 16 channels, and are widely used in residential and commercial photovoltaic power systems.