Photovoltaic Cable
Introduction
Photovoltaic cables are specialized cables designed for power transmission on the DC side of solar photovoltaic power generation systems, including connections between components (component-to-component) and between components and combiner boxes/inverters. Their core characteristic is the ability to operate stably for extended periods in harsh outdoor environments (such as UV radiation, high and low temperatures, and humidity variations), with features like high weather resistance, ozone resistance, and tear resistance, ensuring safe and reliable power transmission for photovoltaic systems over 25 years or more.
Applications
Specifically used for DC-side power connections in solar photovoltaic power generation systems.
Typical application scenarios include: large-scale ground-mounted photovoltaic power plants, commercial and industrial distributed photovoltaic rooftops, residential photovoltaic systems, building-integrated photovoltaics (BIPV), solar streetlights, and off-grid photovoltaic systems. These cables are used to connect photovoltaic components, link components to combiner boxes, and wire the DC segments from combiner boxes to inverters.
Production
Conductor: Uses tinned copper conductors, where the tin coating prevents copper oxidation and corrosion, enhancing long-term connection stability.
Insulation: Employs specialized materials such as cross-linked polyolefin (XLPO), which offer excellent high-temperature resistance (typically 90°C or higher), UV resistance, ozone resistance, and weather resistance.
Sheath: Also made of weather-resistant cross-linked polyolefin (XLPO) material with performance equal to or higher than the insulation, providing dual protection. The sheath is typically black to enhance UV resistance.
Structure: Usually a single-core cable with a relatively simple structure, but extremely high material requirements. There are also dual-core (parallel or twisted) structures.
Key Process Controls: Strictly control the cross-linking degree of insulation and sheath materials to ensure their mechanical properties and dimensional stability at high temperatures; conduct 100% high-voltage testing (e.g., DC withstand voltage); perform long-term aging tests (such as UV aging, thermal aging, and damp heat aging) on samples to verify lifespan.
Services
Selection Consultation: Provide selection recommendations based on system voltage levels (e.g., DC 1.5kV), current capacity, installation environment (exposed, buried, conduit), ambient temperature, and requirements such as halogen-free flame retardancy.
Customized Production: Supports customization of length, conductor cross-section, color (e.g., red for positive, black for negative), and specific certification requirements (e.g., TUV, UL).
Testing and Certification: Products typically require certification from internationally recognized authorities such as TUV or UL, and full certification certificates and test reports can be provided to ensure compliance with standards like IEC 62930 and UL 4703.
Advantages
Ultra-Long Weather Resistance Lifespan: Specialized materials resist long-term UV exposure, extreme temperature cycling (-40°C to +90°C or higher), moisture, and ozone erosion, with a design lifespan matching that of photovoltaic systems (typically over 25 years).
High Electrical Safety: Excellent insulation properties and a high-rated temperature allow the cables to withstand the DC high voltages and potential current surges that may occur in the system, reducing the risk of leakage and fire.
Exceptional Mechanical Performance: Good wear resistance, tear resistance, and mechanical impact resistance, adapting to harsh outdoor installation and operating environments.
Outstanding High and Low-Temperature Performance: Maintains flexibility in both cold and hot environments without cracking or hardening, making installation convenient.
Low System Losses: Optimized conductor and insulation designs help reduce DC-side line losses, improving power generation efficiency. Additionally, the halogen-free flame-retardant properties reduce harmful gas emissions in case of fire, enhancing safety.
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