Rainy days often spark concerns among solar panel owners: "Will my panels get damaged? Does rain reduce efficiency? How to protect them?"This comprehensive guide addresses these questions, backed by scientific insights and industry practices.
1. Types of Solar Panels – Structural Components and Materials
Solar panel makes up of a solar cell, glass, EVA, back panels, frame, etc. The only component is a solar cell which converts light energy into electrical energy. The cells are sealed between the EVA and the back panel, and then they are covered with hard, transparent glass, during assembly.The entire assembly is fixed and protected by an aluminum alloy frame. This structure shields the cells from external environmental factors such as moisture, oxygen, and dust.
2. Waterproof Performance of Solar Panels
Waterproof performance is carefully considered during the design and manufacturing process of solar panels. Several measures ensure their waterproof capabilities:
Glass: Enhanced impact resistance and weather resistance (high-transparency low-iron tempered glass should be used for solar photovoltaic panels)
EVA: EVA provides pairs of glue among the cells, glass and back panels, it is highly resistant to UV and aging, preventing moisture and oxygen from invading.
Backplane: Most backplanes consist of durable composite materials with excellent weather resistant properties (i.e., TPT (Tedlar-Polyester-Tedlar)). TPT has an exceptional resistance to aging, corrosion and moisture.
Frame: The aluminum alloy frame provides a sealed enclosure for components and protects them from the intrusion of moisture.
Due to these design features, solar panels are capable of operating under a vast range of environmental conditions, including heavy rainfall, snow, and ice. For this reason, solar panels are considered waterproof.
3. Testing standards for solar panels
The International Electrotechnical Commission as well as other national standard organizations have developed a suite of testing standards in order to guarantee the reliable operation of solar panels in all kinds of environmental conditions. IEC 61215 and IEC 61730, in particular, describe the design and safety performance requirements for the assessment of silicon photovoltaic modules.
One of the tests they perform is waterproof performance, these include temperature cycle test, damp heat test, and mechanical stress testing to ensure that these panels remain in good condition.
4. Precautions
In addition to having excellent water-resistant properties, there are several other precautions that should be taken before installing and after using your solar panels:
a. When you're putting in the junction box, seal it up good. That way, water stays out.
b. Keep an eye on your solar panel – check for cracks or bends now and then.
c. When a storm rolls in, make sure your stuff is safe from lightning.
d. Snow piling up? Clear it off fast, so your solar panel doesn't get too heavy.
5. Conclusion
From a technical standpoint, rain doesn't scare solar panels. They also ensure solid performance in representative environments and waterproofness against worldwide standards through their construction design, materials of manufacture, manufacturing processes, and testing standards. However, for the long-term stability and safety of the equipment, users still need to pay attention to some details before and after installation and use.
