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DC solar cable twin core 4mm, with its two 4 - square - millimeter cross - sectional area conductors encased in a unified outer sheath, is a commonly used and highly practical component in photovoltaic (PV) systems for direct current (DC) power transmission. Its specific specifications endow it with unique advantages, making it suitable for a wide range of medium - scale solar energy applications.
I. Detailed Structure and Material Configuration
1.1 Conductors
The conductors of this 4mm twin core DC solar cable are crafted from high - purity oxygen - free copper, with a purity typically exceeding 99.97%. This high - quality copper ensures minimal electrical resistance, enabling efficient transfer of DC power generated by solar panels to various components within the PV system, such as inverters and batteries. To enhance the conductors' durability in the outdoor environment, a tin - plating process is applied. The tin coating acts as a protective layer, effectively preventing oxidation caused by moisture, humidity, and temperature fluctuations, thus maintaining the cable's electrical conductivity over time.
The conductors feature a stranded construction, which provides a good balance between flexibility and strength. The fine - stranded design allows the cable to be easily routed through tight spaces, around bends, and within the complex layouts of solar panel arrays during installation. For example, when installing solar panels on a residential rooftop with limited space between rafters, the 4mm twin core DC solar cable can be maneuvered without causing damage to the insulation or conductors, ensuring a smooth installation process.
1.2 Insulation
Inner Insulation: Cross - linked polyethylene (XLPE) or cross - linked polyolefin (XLPO) is commonly used for the inner insulation of each conductor. These materials offer excellent electrical isolation, effectively preventing DC current leakage and ensuring the safety and efficiency of the PV system. The inner insulation can operate stably within a temperature range from - 40°C to + 90°C and withstand short - term temperature spikes up to + 120°C, making the cable suitable for diverse climates, from cold northern regions to hot desert areas.
In some cases, for applications that require enhanced electrical protection, a special formulation of insulation material may be used. This can provide additional resistance to electrical interference and improve the cable's performance in environments with high electromagnetic activity.
Insulation Thickness: The insulation thickness is carefully optimized to ensure reliable electrical protection while maintaining the cable's flexibility. A thicker insulation layer offers better protection against electrical breakdown but may reduce the cable's flexibility. Manufacturers use advanced manufacturing techniques to achieve an ideal insulation thickness for the 4mm twin core DC solar cable. This thickness allows the cable to be easily installed in standard conduits and junction boxes, while still providing sufficient insulation to safeguard the conductors and prevent electrical accidents.
1.3 Outer Sheath
The outer sheath of the 4mm twin core DC solar cable is constructed from UV - stabilized, halogen - free thermoplastic elastomer (TPE). This material provides comprehensive protection against the harsh outdoor elements that the cable will encounter during its service life. The UV - stabilization property of the TPE sheath prevents degradation caused by prolonged sunlight exposure, which can otherwise lead to cracking and weakening of the cable. It also offers excellent resistance to moisture, abrasion, and exposure to mild chemicals, protecting the internal conductors and insulation from damage.
In certain application scenarios, additional protective properties can be incorporated into the outer sheath. For example, in industrial areas where the cable may be exposed to oil or other contaminants, a TPE sheath with enhanced chemical resistance can be used. In coastal regions, a sheath with improved saltwater resistance can extend the cable's lifespan.
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. Distinctive Performance Advantages
3.1 Efficient Medium - Scale Power Transmission
With a total current - carrying capacity of 64A at 90°C, the 4mm twin core DC solar cable 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 cable can transmit the DC power generated by the solar panels to the inverter with minimal power loss. Its low - resistance conductors and high - quality insulation work in tandem to ensure that the energy harvested from the sun is effectively transferred, maximizing the overall efficiency of the PV system.
In small - scale commercial solar setups, such as a local coffee shop or a small office building with a rooftop solar array, the 4mm twin core DC solar cable can also meet the power transmission requirements, providing a stable and reliable connection between the solar panels and the electrical system.
3.2 Balanced Flexibility and Durability
The 4mm twin core DC solar cable offers a balanced combination of flexibility and durability. Its stranded conductors and optimized insulation and sheath materials allow for easy installation in various environments. Whether it's routing the cable along the curved surfaces of a rooftop or through the narrow conduits of a building, the cable can be maneuvered without difficulty.
At the same time, the high - quality materials used in its construction ensure its durability. The UV - stabilized TPE outer sheath protects the cable from the elements, while the robust insulation and conductors can withstand the rigors of long - term outdoor use. This makes the cable suitable for both short - term and long - term PV installations, reducing the need for frequent replacements.
3.3 Cost - Effective Solution for Medium - Scale Projects
For medium - scale solar projects, the 4mm twin core DC solar cable provides a cost - effective solution. Compared to larger - gauge cables, it is more affordable, while still being able to handle the power requirements of these projects. This makes it an attractive option for homeowners and small - business owners who want to install solar systems without incurring excessive costs.
Its compatibility with a wide range of standard PV system components also contributes to cost - savings, as it reduces the need for custom - made or specialized wiring solutions.
3.4 Compatibility with Standard PV Components
The 4mm twin core DC solar cable is highly compatible with a variety of standard PV system components, including common solar panels, inverters, and charge controllers. Its standardized technical specifications ensure seamless integration into different PV systems, whether it's a new installation or an upgrade of an existing system.
This compatibility simplifies the design and installation process, as installers can easily select and use the cable with confidence, knowing that it will work well with the other components in the system.
IV. Application Scenarios
4.1 Residential Solar Installations
In residential settings, the 4mm twin core DC solar cable is widely used for medium - sized rooftop solar systems. Many homeowners choose this cable to connect their solar panels to the inverter and then to the home's electrical distribution system. Its flexibility allows for easy installation on complex roof shapes, and its capacity to handle 5 - 8kW of power output meets the energy needs of most households looking to generate their own electricity.
For example, in a suburban home with a 6kW solar system, the 4mm twin core DC solar cable can efficiently transmit the power generated by the solar panels on the roof to the inverter located in the garage, enabling the homeowner to use clean solar energy to power their appliances and reduce their reliance on the grid.
4.2 Small - Scale Commercial Solar Projects
Small - scale commercial buildings, such as local shops, restaurants, and small offices, often install solar systems to cut down on electricity costs. The 4mm twin core DC solar cable is an ideal choice for these projects. It can handle the power output of the solar panels installed on the building's rooftop and transmit the electricity to the building's electrical infrastructure or feed it back into the grid.
In a small retail store with a 5kW solar system, the 4mm twin core DC solar cable ensures a stable and reliable power connection, helping the store owner save on energy expenses and contribute to a more sustainable business operation.
4.3 Off - Grid and Remote Area Solar Setups
In off - grid locations or remote areas where access to the main electrical grid is limited or unavailable, the 4mm twin core DC solar cable can be used in solar power systems. It can connect solar panels to batteries for energy storage and then distribute the power to electrical loads.
For instance, in a remote cabin in the mountains, a 4mm twin core DC solar cable can be used to connect the solar panels installed on the cabin roof to a battery bank, storing the solar energy during the day and providing power to the cabin's lighting, heating, and other electrical devices at night. Its durability in harsh outdoor environments ensures a stable power supply even in challenging conditions.
4.4 Supplementary Wiring in Larger Solar Systems
In larger solar systems, the 4mm twin core DC solar cable can also be used as supplementary wiring. For example, it can be used to connect individual solar panels within a string or to make connections between different parts of the system where lower - current power transmission is required.
In a large utility - scale solar farm, while larger - gauge cables may be used for the main power transmission lines, 4mm twin core DC solar cables can be employed for the smaller - scale connections within the farm, ensuring a complete and efficient electrical network.