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6mm Twin Solar Cable
I. Product Overview
The 6mm twin solar cable, with each core having a cross-sectional area of 6 square millimeters, is a crucial component in photovoltaic (PV) systems. It features two insulated copper conductors housed within a single, robust outer sheath. This design not only simplifies the wiring process but also ensures efficient and safe power transmission. The cable's black color is commonly associated with negative polarity identification in PV setups, and its construction is engineered to endure harsh outdoor conditions, making it suitable for a wide array of solar projects, from small residential rooftops to large commercial solar farms.
II. Technical Specifications
Parameter | Details |
Conductor Material | Oxygen-free copper (purity ≥99.97%), tinned for superior corrosion resistance |
Cross-Sectional Area per Core | 6 square millimeters |
Total Cross-Sectional Area | 12 square millimeters |
Rated Voltage | 1000V DC or 1500V DC |
Current Rating (90°C) | 41A per core, 82A in total |
DC Resistance (20°C) | ≤3.08Ω/km per core |
Inner Insulation | Cross-linked polyethylene (XLPE) |
Outer Sheath | UV-stabilized, halogen-free thermoplastic elastomer (TPE) |
Overall Diameter | Approximately 8.5 - 9mm |
Minimum Bend Radius | 6 - 8 times the cable diameter (51 - 72mm) |
Operating Temperature | -40°C to +90°C, short-term up to +120°C |
Flame Retardancy | Complies with IEC 60332-1-2 |
Certifications | TÜV EN 50618, IEC 62930, UL 4703, RoHS |
III. Key Features
3.1 Enhanced Power Transmission
With a combined current-carrying capacity of 82A, the 6mm twin solar cable can effortlessly handle the power output of medium to large PV systems. In a real-world 20kW commercial solar installation, this cable can ensure that over 97% of the generated power is effectively transmitted to the inverter, minimizing power losses and optimizing system efficiency. The tinned copper conductors reduce electrical resistance, further enhancing its power transmission capabilities.
3.2 Robust Insulation and Protection
XLPE Inner Insulation: The cross-linked polyethylene inner layer offers excellent electrical insulation, safeguarding against electrical leakage and short circuits. It maintains its integrity across a broad temperature spectrum, ensuring consistent performance in diverse climates. Whether in the frigid cold of -40°C or the sweltering heat of +90°C, the cable's insulation remains reliable.
TPE Outer Sheath: The UV-stabilized TPE outer sheath provides comprehensive protection against various environmental factors. It offers high resistance to ultraviolet radiation, preventing sheath degradation even after years of continuous sunlight exposure. Additionally, it effectively shields the cable from moisture, abrasion, and chemical substances, extending the cable's lifespan and ensuring long-term reliability.
3.3 Installation-Friendly Design
The twin core configuration streamlines the installation process significantly. Instead of handling two separate single-core cables, installers can route the 6mm twin solar cable as a single unit, reducing installation time by up to 30% in complex PV setups. This design also minimizes the risk of incorrect polarity connections, as both positive and negative conductors are integrated within the same sheath, making it a preferred choice for both professional installers and DIY enthusiasts.
IV. Applications
4.1 Residential Solar Installations
In residential settings, the 6mm twin solar cable is widely used for connecting rooftop solar panels. For a typical 5 - 8kW home PV system, it efficiently links multiple panels in series or parallel, ensuring a stable power supply to meet household electricity demands. Its flexibility allows for easy routing around roof structures and through conduits, making installation on residential rooftops straightforward.
4.2 Commercial and Industrial Solar Projects
For commercial buildings like offices, shopping malls, and industrial factories, the 6mm twin solar cable is well-suited to handle the higher power requirements. In a 50kW commercial solar installation on a large office building, this cable can seamlessly collect and transmit the power generated by numerous solar panels to the building's electrical grid or energy storage systems. Its high current-carrying capacity and durability make it reliable for continuous operation in these demanding environments.
4.3 Off-Grid and Remote Area Power Systems
In remote locations where access to the main electrical grid is limited, such as rural villages, islands, or remote research stations, the 6mm twin solar cable plays a vital role in establishing self-sufficient solar power systems. It enables the transfer of power from solar panels to batteries for energy storage and subsequent distribution to electrical loads. Its ability to withstand harsh environmental conditions, including strong winds, heavy rain, and extreme temperatures, ensures stable power supply in these off-grid areas.
4.4 Solar-Powered Equipment and Small-Scale Projects
The cable is also suitable for powering various solar-powered devices, such as solar streetlights, water pumps, and small-scale monitoring systems. Its manageable size and high current-carrying capacity make it an ideal choice for these smaller applications, providing a convenient and efficient power connection solution.
V. Installation and Maintenance
5.1 Installation Guidelines
Termination: Use connectors specifically rated for 6mm² cables and the cable's voltage and current capacity. MC4 connectors are commonly used in PV systems due to their reliable and weatherproof design. Ensure proper crimping of the connectors to create a secure electrical connection. Improperly crimped connectors can lead to loose connections, increased resistance, and potential overheating.
Routing: When routing the cable, adhere to the minimum bend radius requirements to prevent damage to the insulation and conductors. Use cable clips, conduits, or trays to support and protect the cable, especially in areas where it may be exposed to mechanical stress, such as around sharp corners or in high-traffic zones. Separate the cable from other electrical cables to avoid electromagnetic interference and ensure safe operation.
Polarity Connection: Although the black color of the outer sheath may be associated with negative polarity in some cases, always double-check the polarity markings on the cable and the connected components. Incorrect polarity connections can cause system malfunctions, damage to equipment, or even pose a safety hazard.
5.2 Maintenance Tips
Regular Inspection: Conduct routine visual inspections of the cable at least once a year. Look for signs of damage, such as cuts, cracks, or discoloration of the insulation. Pay close attention to the connection points for any signs of overheating, corrosion, or loose connections. Early detection of issues can prevent costly repairs and system failures.
Cleaning: If dirt, dust, or debris accumulates on the cable, clean it gently using a soft, dry cloth. Avoid using abrasive materials or harsh chemicals, as they can damage the outer sheath and compromise the cable's protective properties. In areas with high pollution or salt exposure, more frequent cleaning may be required.
Performance Monitoring: Periodically measure the insulation resistance and DC resistance of the cable to monitor its performance. A significant decrease in insulation resistance or an increase in DC resistance may indicate internal damage or degradation. If such issues are detected, consider replacing the cable promptly to ensure the continued safe and efficient operation of the PV system.
VI. Comparison with Single-Core Solar Cables
Feature | 6mm Twin Solar Cable | 6mm Single-Core Solar Cable |
Installation Complexity | Simplified, single-sheath design | Requires handling two separate cables |
Installation Time | Reduces installation time by up to 30% | Longer installation time due to separate cable routing |
Polarity Error Risk | Lower risk of incorrect connections | Higher risk of misconnecting positive and negative cables |
Cost (per meter) | Slightly higher due to dual-core structure | Lower cost for a single cable |
Ideal Applications | Medium to large PV systems, complex setups | Small PV systems, simple connections |
In conclusion, the 6mm twin solar cable offers a reliable, efficient, and convenient solution for power transmission in various PV applications. Its advanced features, wide range of applications, and ease of installation and maintenance make it a valuable component in the solar energy industry. Whether for residential, commercial, or off-grid solar projects, this cable provides a stable and safe power connection, contributing to the growth and success of renewable energy initiatives.