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PV wire twin core 4mm, with its two insulated conductors each having a cross - sectional area of 4 square millimeters, is a commonly - used option in photovoltaic (PV) systems. Tailored to meet the needs of medium - scale power transmission in solar setups, it combines functionality, durability, and installation convenience.
I. Structure and Material
1.1 Conductors
The conductors of this 4mm twin - core PV wire are made from high - purity oxygen - free copper, typically with a purity exceeding 99.97%. This high - grade copper ensures low electrical resistance, facilitating efficient direct current (DC) power transfer from solar panels to other components in the PV system. To enhance the cable's lifespan in outdoor environments, the copper conductors are usually tin - plated. The tin coating acts as a protective barrier against oxidation caused by moisture, humidity, and temperature fluctuations. The stranded construction of the conductors offers flexibility, enabling easy routing through complex roof structures, narrow conduits, or around solar panel arrays during installation.
1.2 Insulation
Inner Insulation: Cross - linked polyethylene (XLPE) or cross - linked polyolefin (XLPO) is commonly employed as the inner insulation material. These polymers provide excellent electrical isolation, preventing DC current leakage and ensuring the safety and efficiency of the PV system. The insulation can operate stably within a wide temperature range, from - 40°C to + 90°C, and withstand short - term temperature spikes up to + 120°C. This temperature resilience makes the 4mm twin - core PV wire suitable for various climates, whether it's the cold winters in northern regions or the hot summers in desert areas.
Insulation Thickness: The insulation thickness is carefully optimized. A thicker insulation layer offers enhanced protection but may increase the cable's diameter, potentially complicating installation. Manufacturers strike a balance to ensure that the wire provides sufficient electrical insulation while remaining manageable for installation in tight spaces, such as small junction boxes or confined cable trays.
1.3 Outer Sheath
Constructed from UV - stabilized, halogen - free thermoplastic elastomer (TPE), the outer sheath of the 4mm twin - core PV wire provides comprehensive protection against environmental elements. In outdoor PV installations, the cable is constantly exposed to sunlight, rain, snow, and mechanical stress. The UV - stabilization property of the TPE sheath prevents degradation due to prolonged sunlight exposure. Its moisture - and abrasion - resistance features safeguard the internal conductors and insulation from water ingress and physical damage, ensuring the wire's long - term durability and reliable performance.
II. Technical Specifications
Parameter | Details |
Cross - Sectional Area per Core | 4mm² |
Total Cross - Sectional Area | 8mm² |
Rated Voltage | Typically 1000V DC or 1500V DC |
Current Rating (90°C) | 32A per core, 64A in total |
DC Resistance (20°C) | ≤4.61Ω/km per core |
Overall Diameter | Approximately 7.2 - 7.8mm |
Minimum Bend Radius | 6 - 8 times the cable diameter (43.2 - 62.4mm) |
Flame Retardancy | Complies with IEC 60332 - 1 - 2 |
Certifications | TÜV EN 50618, IEC 62930, UL 4703, RoHS |
III. Performance Advantages
3.1 Efficient Power Transmission
With a total current - carrying capacity of 64A at 90°C, the 4mm twin - core PV wire is well - suited for handling the power output of medium - sized PV systems. In a typical residential solar installation with a power output of around 5 - 8kW, this wire can transmit the DC power generated by the solar panels to the inverter with minimal power loss. The combination of low - resistance conductors and quality insulation ensures that a large proportion of the energy generated by the solar panels is effectively transferred, maximizing the overall efficiency of the PV system.
3.2 Installation Ease
The twin - core design simplifies the installation process. Having both conductors enclosed in a single outer sheath reduces the number of individual wires to handle, saving installation time and reducing the likelihood of errors. The flexibility of the wire, thanks to its stranded conductors, allows for easy routing in different installation scenarios, whether it's along the curved surfaces of rooftops or through the intricate wiring layouts of commercial buildings.
3.3 Compatibility
The 4mm twin - core PV wire is highly compatible with a wide range of PV system components, including common solar panels, inverters, and charge controllers. Its standard technical specifications make it a versatile choice for both residential and small - to - medium - sized commercial solar installations. Whether it's a simple home solar setup or a more complex commercial project, this wire can be easily integrated into the system, providing a reliable power connection.
3.4 Durability
Built with high - quality materials and in compliance with strict industry standards, the 4mm twin - core PV wire has a long service life, usually ranging from 15 - 25 years. It can endure harsh outdoor conditions, such as intense sunlight, heavy rain, strong winds, and extreme temperature changes. The wire's resistance to mechanical stress, UV radiation, moisture, and abrasion ensures that it maintains its performance over time, reducing the need for frequent replacements and minimizing maintenance costs for PV system owners.
IV. Application Scenarios
4.1 Residential Solar Installations
For residential rooftop solar systems, the 4mm twin - core PV wire is a popular choice. Most households with solar power systems having a capacity of 3 - 10kW can benefit from this wire. It efficiently connects the solar panels on the roof to the inverter installed indoors, ensuring a stable and reliable power supply while helping homeowners reduce their reliance on the grid.
4.2 Small - Scale Commercial Solar Projects
Small - scale commercial buildings, such as local stores, cafes, and small offices, often opt for solar installations to cut down on electricity costs. The 4mm twin - core PV wire can handle the relatively lower power outputs of these commercial setups. Its ability to provide a stable power connection, along with its ease of installation and cost - effectiveness, makes it a practical option for small - business owners looking to adopt sustainable energy solutions.
4.3 Off - Grid and Remote Area Solar Setups
In off - grid or remote areas where access to the main electrical grid is limited or unavailable, the 4mm twin - core PV wire can be used in solar power systems. For example, in a remote cabin or a small community solar project in a rural area, this wire can connect the solar panels to batteries for energy storage and then distribute the power to electrical loads. Its durability and performance in harsh outdoor environments make it a reliable choice for ensuring a stable power supply in these challenging locations.