The PV Combiner Box is a core component on the DC side of photovoltaic power plants. It is primarily used to aggregate DC currents from multiple PV module strings and output them to DC distribution cabinets and inverters, effectively simplifying complex on-site wiring and reducing construction costs.
Available in both intelligent and standard (non-intelligent) versions, the product integrates multiple safety features such as fuse protection, surge protection, and grounding protection. Combined with a standardized outdoor-rated enclosure and an intelligent monitoring system, it is suitable for outdoor operation in large-to-medium-scale ground-mounted and distributed PV power plants, offering structural stability, ease of maintenance, and high adaptability.
This PV Combiner Box supports DC inputs from up to 24 PV module strings, aggregating multiple dispersed DC sources into single or multiple centralized outputs. This significantly simplifies upstream wiring between the PV array and the inverter/DC distribution cabinet, reduces on-site wiring clutter, and improves the overall organization and neatness of the PV power plant.
The equipment is categorized into intelligent and non-intelligent types to meet varying project budgets and O&M standards. Non-intelligent models focus on basic string combination and safety protection, making them suitable for standard PV projects. Intelligent models feature dedicated monitoring units capable of comprehensive data acquisition and equipment status monitoring, making them ideal for smart PV power plants.
1. Individual String Fuse Protection: Both the positive and negative terminals of each PV string are equipped with specialized PV fuses and matching fuse holders. In the event of a fault in a single string, the fuse isolates the circuit quickly, preventing the fault from spreading to the entire string or the whole plant; this also lowers replacement costs and ensures the safety of O&M personnel during maintenance.
2. Comprehensive Busbar-Side Protection: The output side comes standard with circuit breakers and high-voltage surge protection devices (SPDs). Coupled with a robust grounding system, it provides short-circuit, over-voltage, lightning surge, and ground-fault protection, comprehensively addressing common electrical hazards on the DC side.
1. High-Voltage Surge Protection: The PV Combiner Box features a built-in high-voltage SPD designed specifically for PV applications. With a continuous operating voltage (busbar-to-ground) of up to 1000 VDC, it reliably handles transient surges and over-voltage spikes in high-voltage PV systems, meeting the requirements of high-voltage grid-connected power plants.
2. High-Voltage System Compatibility: The internal power supply module supports PV input voltages up to 1000 VDC and is compatible with mainstream high-voltage PV module systems. Its high versatility allows it to be used in the vast majority of distributed and centralized PV projects.
1. High-Precision Data Acquisition: Intelligent models are equipped with DC CT (Current Transformer) sensor modules for real-time monitoring of string currents, busbar voltage, and internal enclosure temperature. They also automatically detect the operating status of SPDs and circuit breakers, ensuring stable and accurate data collection.
2. Local Display Functionality: The unit features a digital display screen, allowing for on-site viewing of string currents, busbar voltage, enclosure temperature, system power, device address, and component status. This enables on-site verification of equipment operation without the need for a backend monitoring system.
3. Fault Localization and Alarming: Supports automatic fault alarms and precise local fault localization, helping O&M personnel quickly identify anomalies, reduce troubleshooting time, and improve the operational efficiency of the PV power plant.
1. Standard Communication Protocols: Comes standard with an RS485 interface and supports the universal MODBUS-RTU protocol. It enables stable integration with PV power plant monitoring platforms for data uploading, parameter downloading, and remote commissioning.
2. Secondary Surge Protection for Interfaces: All external communication interfaces feature independent surge protection structures to prevent communication drops or equipment failure caused by outdoor lightning strikes and surge interference, ensuring stable, long-term data transmission.
1. External Power Supply Mode: Supports 220V AC/DC external power input, making PV Combiner Box suitable for scenarios without PV voltage—such as periods of no sunlight or standby maintenance—thereby ensuring continuous online monitoring.
2. PV Self-Powered Mode: Can operate directly using voltage from the PV array, eliminating the need for separate power cabling; this significantly reduces material and labor costs while simplifying on-site wiring.
1. High-Standard Protection: Features an IP65 ingress protection rating, offering resistance to water, dust, rust, and salt spray; it withstands harsh environmental conditions such as heavy rain, dust accumulation, humidity-induced corrosion, and coastal salt spray.
2. Outdoor-Ready Structure: Designed for secure wall-mounted installation with a compact footprint; the interior features organized wiring and a streamlined structure, resulting in low failure rates and facilitating easy maintenance and component replacement.
1. Standardized Quality Manufacturing: As a professional Chinese manufacturer and supplier of PV combiner boxes, Junray Electrical adheres to strict industry standards, utilizing reliable core components to ensure long-term, stable operation.
2. Multi-Dimensional Customization: Enclosure structure, configuration, display functions, and communication parameters can be tailored to specific project requirements; this allows for precise alignment with the unique installation and O&M needs of various PV projects without compromising core safety performance.
1. Large-Scale Ground-Mounted PV Power Plants: Meets the requirements for current combining and protection in high-capacity, centralized PV arrays.
2. Commercial and Industrial Distributed PV: Suitable for PV systems on factory rooftops and commercial buildings.
3. PV Projects in Challenging Environments: Capable of operating in harsh outdoor settings, including mountainous terrain, deserts, and coastal areas with high salt spray.
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