Service Hotline
+86 13564958513
The red and black twin 4mm solar cable, a specific type of twin - core solar cable, is widely utilized in photovoltaic (PV) systems for its distinct color - coding and suitable power - handling capacity. With two insulated conductors, each having a cross - sectional area of 4 square millimeters, and marked distinctly in red and black, it offers both functional advantages and installation conveniences.
I. Structure and Material
1.1 Conductors
Crafted from high - purity oxygen - free copper with a purity often exceeding 99.97%, the conductors of this 4mm twin solar cable ensure efficient power transfer. The tin - plating on the copper conductors enhances oxidation resistance, which is crucial for maintaining stable conductivity in outdoor PV environments exposed to moisture, humidity, and temperature fluctuations. The stranded design of the conductors provides flexibility, allowing installers to route the cable easily around complex roof structures, through narrow conduits, or within solar panel arrays. The red and black color - coding of the conductors serves as a clear indicator for positive and negative poles respectively. During installation, this straightforward color - based identification significantly reduces the risk of incorrect connections, ensuring the proper functioning of the PV system's electrical circuit.
1.2 Insulation
Inner Insulation: Cross - linked polyethylene (XLPE) or cross - linked polyolefin (XLPO) is commonly used as the inner insulation material. These polymers offer excellent electrical isolation, effectively preventing DC current leakage. Capable of operating within a temperature range from - 40°C to + 90°C and withstanding short - term temperature spikes up to + 120°C, the insulation ensures reliable performance in diverse climates, whether it's a cold region with heavy snowfall or a hot area with intense sunlight.
Insulation Thickness: The insulation thickness of the 4mm twin solar cable is carefully optimized. A balance is struck to provide sufficient electrical protection while keeping the cable's diameter manageable for installation. This optimization allows the cable to be installed in tight spaces, such as small junction boxes or narrow cable trays, without sacrificing the integrity of the insulation.
1.3 Outer Sheath
Constructed from UV - stabilized, halogen - free thermoplastic elastomer (TPE), the outer sheath provides comprehensive protection against environmental elements. It shields the cable from UV radiation, moisture, abrasion, and exposure to mild chemicals. In outdoor PV installations, the UV - stabilization property of the TPE sheath is vital for preventing degradation of the cable over time due to prolonged sunlight exposure. The moisture - and abrasion - resistance features safeguard the internal conductors and insulation, ensuring the cable's long - term durability and performance.
II. Technical Specifications
Parameter | Details |
Cross - Sectional Area per Core | 4mm² |
Total Cross - Sectional Area | 8mm² |
Rated Voltage | Usually 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 red and black twin 4mm solar cable can efficiently handle the power output of medium - sized PV systems. In a typical residential solar installation with a power output of around 5 - 8kW, this cable can transmit the DC power generated by the solar panels to the inverter with minimal power loss. Its low - resistance conductors and quality insulation work in tandem to ensure that the electricity generated by the panels is effectively transferred, maximizing the energy harvested from the sun and enhancing the overall efficiency of the PV system.
3.2 Installation Ease
The red and black color - coding simplifies the installation process significantly. Even for less - experienced installers or DIY enthusiasts, the clear indication of positive and negative poles through color reduces the learning curve and potential errors during wiring. Additionally, the twin - core design, with both conductors enclosed in a single outer sheath, is easier to handle compared to using two separate single - core cables. It reduces the number of individual cables to manage, streamlining the installation and saving time.
3.3 Compatibility
This 4mm twin solar cable 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 suitable choice for both residential and small - to - medium - scale commercial solar installations. Whether it's a simple rooftop solar setup or a more complex commercial project with multiple connection points, the red and black twin 4mm solar cable can be easily integrated into the system, providing a reliable power connection.
3.4 Durability
Built with high - quality materials and constructed to meet strict industry standards, the red and black twin 4mm solar cable has a service life typically ranging from 15 - 25 years. It can endure harsh outdoor conditions, including intense sunlight, heavy rain, strong winds, and extreme temperature fluctuations. The cable's resistance to mechanical stress and environmental wear ensures that it can maintain its performance over the long term, 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 red and black twin 4mm solar cable is an ideal choice. Most homes have solar power systems with a capacity of 3 - 10kW, and this cable can efficiently connect the solar panels on the roof to the inverter installed in the garage or utility room. Its color - coding and easy - to - install design make it accessible for homeowners looking to embrace solar energy and reduce their reliance on the grid.
4.2 Small - Scale Commercial Solar Projects
Small - scale commercial buildings, such as local shops, cafes, and small offices, often opt for solar installations to cut down on electricity costs. The red and black twin 4mm solar cable can handle the relatively lower power outputs of these commercial setups. Its ability to provide a stable power connection while being cost - effective and easy to install makes it a popular option for small - business owners aiming 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, this cable can be used in solar power systems. For example, in a remote cabin or a small community solar project in a rural area, the red and black twin 4mm solar cable 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.