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PV DC combiner box
Overview
Photovoltaic combiner boxes are used in photovoltaic power generation systems to reduce the number of cables connecting photovoltaic modules to inverters. Protected by specialized photovoltaic fuses, circuit breakers, and surge arresters, they enhance reliability and facilitate system maintenance.
Users can connect a specified number of identical PV modules in series to form a string based on the inverter's DC input voltage range. Multiple strings are then connected to the array's surge-protected combiner box. Output is protected by surge arresters and circuit breakers, simplifying connection to downstream inverters.
Key Technical Parameters
Item | FLX-DC |
Electrical Parameters | |
System DC Voltage | 250/500/750/1000/1500 |
Input Current per Channel | 10A~30A |
Number of Input Channels | 2~24 channels |
Maximum Output Switching Current | 20A~630A |
Number of Output Channels | 1/2/3/4/5/6 |
Surge Protection | |
Test Category | 11-pole protection |
Nominal Discharge Current | 20kA |
Maximum Discharge Current | 40kA |
Voltage Protection Level | 3.8kV |
Maximum Continuous Operating Voltage | 1500V |
Pole Configuration | 2P, 3P, 4P |
Structural Features | Plug-in Modules |
System | Classification |
Protection Rating | IP65 |
Output Switch | DC Circuit Breaker (Standard)/DC Rotary Disconnector (Optional) |
MC4/Waterproof Connector | Optional |
PV DC Fuse | Standard |
PV DC Surge Protector | Standard |
Monitoring Module | Optional |
Anti-Reverse Diode | Optional |
Enclosure Material | Cold-rolled steel with powder coating, Stainless steel, Fiberglass (SMC), Plastic case (ABS) |
Mounting Method | Wall-mounted |
Operating Temperature | -25°C to +55°C |
Altitude | 2000 m |
Permissible Relative Humidity | 0~95%, non-condensing |
Key Features
- The cabinet body is constructed from hot-dip galvanized steel plate, ensuring a secure and reliable structure with sufficient mechanical strength. This guarantees no shaking or deformation during component installation or operation.
- With an IP65 protection rating, it offers waterproof, dustproof, rustproof, and salt spray resistance, meeting outdoor installation requirements. It can simultaneously connect up to 24 photovoltaic arrays.
- Each PV string's positive and negative terminals are protected by dedicated PV fuses. Fuse bases and fuses are matched for use, reducing long-term maintenance costs for owners and effectively safeguarding maintenance personnel.
- The DC output busbar is equipped with dedicated PV surge arresters. It provides robust surge protection for positive-to-ground, negative-to-ground, and positive-to-negative connections.
- The combiner box incorporates a modular intelligent monitoring unit that detects current, output voltage, enclosure temperature, surge arrester status, and circuit breaker status for each string of modules;
- The intelligent monitoring unit features a digital display capable of showing current, voltage, power, temperature, device address, and device ID directly on the unit; The entire modular combiner box intelligent monitoring unit consumes less than 4W power with a measurement accuracy of 0.5%;
- Supports multiple remote data transmission methods, providing RS485 and wireless ZigBee interfaces. Communication ports incorporate built-in surge protection to safeguard device interfaces.
DC Combiner Box Wiring Diagram and Layout Diagram
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