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4mm² Twin PV Cable
I. Product Overview
The 4mm² twin PV cable is a specialized electrical cable designed for efficient direct current (DC) power transmission within photovoltaic systems. Comprising two insulated copper conductors encased in a single, durable outer sheath, this cable simplifies wiring processes while ensuring reliable power transfer. With each core having a cross - sectional area of 4 square millimeters, it strikes a balance between flexibility and current - carrying capacity, making it suitable for a diverse range of solar applications, from small - scale residential setups to mid - sized commercial projects.
II. Technical Specifications
Parameter | Details |
Conductor Material | Oxygen - free copper (≥99.97%), tinned for enhanced anti - corrosion |
Cross - Sectional Area per Core | 4 square millimeters |
Total Cross - Sectional Area | 8 square millimeters |
Rated Voltage | 1000V DC / 1500V DC |
Current Rating (90°C) | 32A per core, 64A in total |
DC Resistance (20°C) | ≤4.61Ω/km per core |
Inner Insulation | Cross - linked polyethylene (XLPE) |
Outer Sheath | UV - stabilized, halogen - free thermoplastic elastomer (TPE) |
Overall Diameter | Approximately 7.2 - 7.8mm |
Minimum Bend Radius | 6 - 8 times cable diameter (43.2 - 62.4mm) |
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 Efficient Power Transmission
With a combined current - carrying capacity of 64A, the 4mm² twin PV cable can handle the power output of small to medium - sized PV systems. In a typical 8kW residential solar installation, it ensures minimal power loss during transmission, maintaining high system efficiency. The tinned copper conductors reduce electrical resistance, optimizing the cable's performance in power - intensive scenarios.
3.2 Durable Insulation System
XLPE Inner Insulation: The cross - linked polyethylene inner layer provides excellent electrical insulation, preventing leakage and short circuits. It retains its integrity across a wide temperature range, ensuring consistent performance in various climates, from cold regions to hot, sunny areas.
TPE Outer Sheath: The UV - stabilized TPE outer sheath offers robust protection against environmental factors. It resists long - term UV radiation, moisture, abrasion, and mild chemicals, extending the cable's lifespan and ensuring reliable operation in outdoor environments.
3.3 Installation - Friendly Design
The twin - core structure simplifies installation by integrating both positive and negative conductors within one sheath. This design reduces installation time by up to 25% compared to using two separate single - core cables, especially in complex PV setups. Additionally, it minimizes the risk of incorrect polarity connections, making it a preferred choice for both professional installers and DIY enthusiasts.
IV. Applications
4.1 Residential Solar Systems
Ideal for connecting rooftop solar panels in homes. In a standard 3 - 8kW residential PV setup, the 4mm² twin PV cable efficiently links panels in series or parallel, ensuring a stable electricity supply for household use, including powering appliances, lighting, and heating systems. Its flexibility allows for easy routing around roof structures and through conduits.
4.2 Small Commercial Installations
Suitable for small - scale commercial buildings such as shops, restaurants, and small offices. These installations typically have lower power demands, and the 4mm² twin PV cable can effectively handle the power generated by the solar panels, transmitting it to the building's electrical system or grid - connection points.
4.3 Off - Grid and Remote Area Installations
In remote locations where grid access is limited, like rural villages, cabins, or remote research stations, the 4mm² twin PV cable is crucial for establishing self - sufficient solar power systems. It enables power transfer from solar panels to batteries for storage and subsequent distribution to electrical loads, ensuring reliable power supply in off - grid environments.
4.4 Solar - Powered Devices and Mini - Grids
Well - suited for powering various solar - powered devices, including solar streetlights, water pumps, and small - scale monitoring systems. Its compact size and manageable current - carrying capacity make it an excellent choice for these smaller applications, providing a convenient and efficient power connection solution.
V. Installation and Maintenance
5.1 Installation Guidelines
Termination: Use connectors rated for 4mm² cables and the cable's voltage and current capacity. MC4 connectors are commonly used in PV systems due to their reliability and weatherproof design. Ensure proper crimping to create a secure electrical connection, as loose connections can lead to overheating and decreased performance.
Routing: When routing the cable, follow the minimum bend radius requirements to avoid damaging the insulation and conductors. Use cable clips, conduits, or trays to support and protect the cable, especially in areas prone to mechanical stress or physical damage. Separate the cable from other electrical cables to prevent interference.
Polarity Connection: Double - check the polarity markings on the cable and connected components. Incorrect polarity connections can cause system malfunctions, damage to equipment, or safety hazards.
5.2 Maintenance Tips
Regular Inspection: Conduct annual visual inspections to check for signs of damage, such as cuts, cracks, or discoloration of the insulation. Pay close attention to connection points for any signs of overheating, corrosion, or loose connections.
Cleaning: If dirt, dust, or debris accumulates on the cable, clean it gently with a soft, dry cloth. Avoid using abrasive materials or harsh chemicals that could damage the outer sheath.
Performance Monitoring: Periodically measure the insulation resistance and DC resistance of the cable to assess its performance. A significant decrease in insulation resistance or an increase in DC resistance may indicate internal damage, requiring prompt replacement to ensure the safe and efficient operation of the PV system.
VI. Comparison with Other Cable Sizes
Cable Size (mm²) | Twin Cable Current Rating (90°C) | Ideal Application Scale | Flexibility |
2.5 | 25A per core, 50A in total | Small residential (≤3kW) | High |
4 | 32A per core, 64A in total | Medium residential, small commercial | Moderate |
6 | 41A per core, 82A in total | Larger commercial, industrial | Low |
The 4mm² twin PV cable offers a balanced solution, providing sufficient current - carrying capacity for a wide range of applications while maintaining reasonable flexibility for easy installation. Its cost - effectiveness and reliable performance make it a popular choice in the solar energy industry.