Photovoltaic cable
Nov 24, 2023
Many countries are still in the learning phase. There is no doubt that in order to obtain the best profits, companies in the industry need to learn from countries and companies that have many years of experience in solar energy applications.
Building cost-effective and profitable photovoltaic power plants represents the most important goal and core competitiveness of all solar manufacturers. In fact, profitability depends not only on the efficiency or high performance of the solar module itself, but also on a series of components that may not appear to be directly related to the module. But all these components (such as cables, connectors, junction boxes) should be selected based on the long-term investment goals of the tenderer. The high quality of the selected components can prevent high repair and maintenance costs that could render a solar system unprofitable.
For example, the wiring system connecting PV modules to the inverter is not typically considered a critical component.
However, failure to use dedicated cables for solar applications will affect the service life of the entire system.
In practice, solar systems are often used under harsh environmental conditions, such as high temperatures and UV radiation. In Europe, sunny days can lead to on-site temperatures of up to 100°C for solar systems. At this point, the various materials available to us are PVC, rubber, TPE and high-quality cross-link materials, but unfortunately, rubber cables rated at 90°C, and even PVC cables rated at 70°C It is also often used outdoors. Obviously, this will greatly affect the service life of the system.
Hongzhou solar cable production has a history of more than 10 years. Solar installations with this type of cable have also been in use for many years and are still in good working order.
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environmental stress
For photovoltaic applications, materials used outdoors should be tailored to UV rays, ozone, severe temperature changes and chemical attack. The use of low-grade materials under this kind of environmental stress will cause the cable jacket to be brittle and even break down the cable insulation. All of these situations directly increase cable system losses, as well as the risk of cable short circuits and, in the medium to long term, a higher likelihood of fire or personal injury.
HUBER+SUHNER RADOX® Solar Cable is an electron beam cross-link cable rated to 120°C to withstand harsh climatic conditions and mechanical shock in the installation. According to the international standard IEC216, RADOX® solar cables have a service life 8 times that of rubber cables and 32 times that of PVC cables in outdoor environments. Not only do these cables and components offer optimal resistance to weathering, UV rays and ozone attack, they can also withstand a wider range of temperature changes (e.g. from –40°C to 125°C).
To deal with potential dangers caused by high temperatures, manufacturers tend to use double-insulated rubber-sheathed cables (for example: H07 RNF). However, the standard versions of these cables are only permitted for use in environments with a maximum operating temperature of 60°C. In Europe, the measurable temperature on rooftops is as high as 100°C.
RADOX® solar cables are rated for 120°C (20,000 hours of use). This rating equates to 18 years of use at sustained temperatures of 90°C; and even longer at temperatures below 90°C. Generally, the service life of solar energy equipment is required to be more than 20 to 30 years.
For all the reasons mentioned above, it is very necessary to use special solar cables and components in solar systems.
Resistance to mechanical loads
In fact, during installation and maintenance, cables can be routed on sharp edges of the roof structure, while the cables must withstand pressure, bending, tension, cross-tension loads and severe impacts. If the cable sheath is not strong enough, the cable insulation layer will be severely damaged, which will affect the service life of the entire cable or lead to problems such as short circuits, fires, and personal injury hazards.
Radiated cross-linked materials have high mechanical strength. The cross-linking process changes the chemical structure of the polymer, converting the meltable thermoplastic material into a non-meltable elastomeric material, and the cross-linking radiation significantly improves the thermal, mechanical and chemical properties of the cable insulation material.
The characteristics of photovoltaic cables are determined by their cable-specific insulation materials and sheath materials, which we call cross-linked PE. After being irradiated by an irradiation accelerator, the molecular structure of the cable materials will change, thereby providing all aspects of its performance. . Resistance to mechanical loads In fact, during installation and maintenance, cables can be routed on sharp edges of roof structures and must withstand pressure, bending, tension, cross-tension loads and strong impacts. If the cable sheath is not strong enough, the cable insulation layer will be severely damaged, which will affect the service life of the entire cable or lead to problems such as short circuits, fires, and personal injury hazards.
