How Rainy Days Affect Your Solar Panels

With the start of June, comes the start of the rainy season here in the Philippines! Though there’s an assumption that solar panels are meant only for sunny days, did you know that isn’t entirely true? But how does the weather or the rainy season actually affect your solar panels or your solar photovoltaic (pv) system?

First things first, solar panels generate electricity by harnessing the sunlight. But, the rainy season does not necessarily equate to zero solar production, as a matter of fact, solar panels can still produce 30% to 50% of their maximum power when it’s cloudy and 10% to 20% of its optimal production when there’s heavy rain.

There’s still a lot more to learn! Here are 5 things to know about solar pv systems and how the rainy season affects them:

1. Rain Can Help Clean Your Solar Panels:

Rain can indeed help clean solar panels to some extent. Here’s how rain can contribute to the cleaning process:

1. Rinse off dust and dirt: Rainwater can rinse off the dust, dirt, and debris that accumulate on the surface of solar panels over time. This can improve the overall efficiency of the panels by allowing more sunlight to reach the photovoltaic cells.
2. Remove light residues: Rain can also help remove light residues such as pollen, bird droppings, and leaves. These residues can partially block the sunlight and reduce the energy output of the solar panels. Rainwater can effectively wash away such contaminants, keeping the panels clean and maximizing their performance.

However, it’s important to note that rain alone may not completely clean heavily soiled or stubbornly stuck-on debris. In areas with low rainfall or high levels of pollution, additional cleaning may be required to maintain optimal solar panel efficiency. Here are a few considerations:

1. Self-cleaning coatings: Some solar panels have self-cleaning coatings that are designed to repel dirt and debris, making them easier to clean when it does rain.
2. Regular maintenance: Regularly inspect your solar panels for any noticeable dirt, debris, or shading that might affect their performance. If you notice heavy soiling or significant debris buildup, it’s advisable to clean the panels manually.
3. Manual cleaning: To manually clean your solar panels, follow the manufacturer’s guidelines and recommendations. Typically, a soft brush or sponge, mild detergent, and a gentle stream of water are sufficient. Avoid using abrasive materials or harsh chemicals that could damage the panels.
4. Safety precautions: If you decide to clean the panels yourself, prioritize safety. Ensure that you can access the panels safely using appropriate equipment such as a stable ladder. If you are uncomfortable or unsure about cleaning the panels, consider hiring a professional solar panel cleaning service.

Remember, maintaining clean solar panels is essential for their optimal performance and energy production. Regular inspection and appropriate cleaning methods will help you get the most out of your solar power system.

 

2. The Right Type and Brand of Solar Panels Matters:

 

Yes, the type and brand of solar panels you choose can have a significant impact on the performance, efficiency, and longevity of your solar power system. Here are some key considerations:

1. Type of Solar Panels: a. Monocrystalline: Monocrystalline solar panels are made from a single crystal structure and are known for their high efficiency and sleek black appearance. They perform well in various lighting conditions and have a long lifespan. However, they tend to be more expensive than other types.
2. b. Polycrystalline: Polycrystalline solar panels are made from multiple silicon crystals. They are generally less expensive than monocrystalline panels but have slightly lower efficiency. They are a popular choice for residential installations due to their cost-effectiveness.c. Thin-Film: Thin-film solar panels are lightweight and flexible, making them suitable for certain applications such as curved surfaces or portable systems. They have lower efficiency compared to crystalline panels but can perform better in low light conditions.
3. Efficiency: Solar panel efficiency refers to the amount of sunlight a panel can convert into electricity. Higher efficiency panels can generate more electricity per square meter, which can be beneficial if you have limited roof space. However, higher efficiency panels often come at a higher cost.
4. Durability and Warranty: Look for solar panels that are durable and have a long warranty period. This ensures that the panels are built to withstand various weather conditions and will continue to perform effectively over their lifespan. Warranty terms can vary, so consider the length of coverage and the reputation of the manufacturer.
5. Certification and Standards: Check if the solar panels meet industry standards and certifications. Look for panels that have been tested and certified by reputable organizations such as the International Electrotechnical Commission (IEC) or Underwriters Laboratories (UL).
6. Brand Reputation: Consider the reputation and track record of the solar panel manufacturer. Look for companies with a proven history of quality products and reliable customer support. Research customer reviews and industry rankings to gauge the overall satisfaction with a particular brand.
7. Cost: While it’s important to consider the cost of solar panels, it’s also essential to evaluate the long-term benefits and return on investment. Higher quality panels may have a higher upfront cost but can provide better performance and durability over time.

When choosing the right type and brand of solar panels, it’s recommended to consult with solar energy professionals or reputable installers. They can provide personalized recommendations based on your specific needs, location, budget, and energy goals.

 

3. Solar Panels Protect Your Roof:

 

Solar panels can provide some level of protection to your roof. Here’s how solar panels can contribute to roof protection:

1. Shielding from the elements: Solar panels act as a protective layer that shields the underlying roofing materials from direct exposure to the elements such as sunlight, rain, snow, and hail. They serve as a barrier that helps prevent weather-related damage to the roof, extending its lifespan.
2. UV radiation reduction: Solar panels absorb sunlight and convert it into electricity. As a result, they reduce the amount of direct UV radiation reaching the roof’s surface. UV radiation can cause roof materials to degrade over time, leading to cracks, fading, and deterioration. By reducing UV exposure, solar panels can help slow down the aging process of the roof.
3. Temperature moderation: Solar panels create a gap between the roof’s surface and the panels themselves. This gap allows for air circulation, which can help reduce the temperature of the roof. By minimizing heat absorption, solar panels can help prevent thermal stress on the roof, reducing the risk of warping or other heat-related damage.
4. Debris protection: Solar panels act as a barrier against debris such as leaves, branches, and bird droppings that might accumulate on the roof. This can minimize the need for frequent roof cleaning and reduce the chances of clogged gutters or drainage issues.
5. Structural reinforcement: Solar panels are typically installed with mounting systems that secure them to the roof. This installation process can provide additional structural reinforcement to the roof, making it more resistant to certain external forces such as wind uplift.

It’s important to note that proper installation is crucial to ensure the benefits of roof protection. Qualified solar installers will ensure that the panels are securely mounted to the roof and that the installation does not compromise the integrity of the roof. Additionally, regular inspections and maintenance of the solar panels are necessary to ensure there are no issues or damage that could affect the underlying roof.

However, it’s essential to consult with a professional roofing contractor or solar installer before installing solar panels to assess the condition and suitability of your roof for solar panel installation. They can provide expert advice on the compatibility of your roof and the best installation practices to maximize both the solar benefits and the roof protection.

 

4. Rackings or Mountings are Important on Rainy Days:

Rackings or mountings for solar panels play an important role, especially during rainy days. Here’s why they are significant:

1. Secure installation: Rackings or mountings provide a secure and stable platform for solar panels on the roof. This ensures that the panels are firmly attached and can withstand various weather conditions, including heavy rain and wind. Properly installed rackings or mountings prevent the panels from shifting or dislodging during storms, reducing the risk of damage to both the panels and the roof.
2. Drainage and water runoff: Rackings or mountings are designed to allow for proper drainage and water runoff. They elevate the solar panels slightly above the roof surface, creating a gap that allows rainwater to flow freely and prevent water accumulation. This helps to prevent water pooling on the roof, which can lead to leaks, structural damage, and other issues.
3. Protection against water infiltration: Well-designed rackings or mountings include features that help protect against water infiltration. They have sealing mechanisms and flashing components that prevent water from seeping into the roof through the attachment points of the panels. This helps maintain the integrity of the roof and prevents water-related damage.
4. Enhanced ventilation: Rackings or mountings provide space between the solar panels and the roof, allowing for improved ventilation. This airflow helps to keep the roof surface drier and reduces the likelihood of moisture-related problems, such as mold or rot, which can be exacerbated by excessive moisture buildup.
5. Durability in harsh conditions: Rackings or mountings are typically made from materials that are durable and resistant to corrosion. They are designed to withstand prolonged exposure to various weather conditions, including rain, without deteriorating or compromising the stability of the solar panel installation.

During rainy days, having reliable rackings or mountings ensures the overall performance and longevity of the solar panel system. They help maintain the structural integrity of the installation, protect against water damage, and promote effective water drainage. It’s essential to work with experienced solar installers who understand the importance of proper racking or mounting systems and can ensure a secure and weather-resistant installation.

5. Brownouts or Blackouts During Typhoon Won’t Affect Your System

Brownouts or blackouts during a typhoon can potentially affect your solar power system. Here’s why:

1. Grid-tied systems: Most residential solar power systems are grid-tied, meaning they are connected to the local electric grid. In the event of a brownout or blackout, grid-tied systems are designed to shut down automatically for safety reasons. This is done to prevent the flow of electricity from the solar panels into the grid, which could pose a risk to utility workers attempting to restore power.
2. Anti-islanding protection: Grid-tied solar systems have anti-islanding protection mechanisms to ensure that they do not continue generating and supplying electricity to the local grid during a blackout. These protection mechanisms are required by electrical safety standards and regulations.
3. Lack of backup power: In the absence of a battery storage system or backup power source, a grid-tied solar power system will not provide electricity to your home during a brownout or blackout. This is because the system is designed to rely on the grid for electricity supply when solar generation is insufficient or unavailable.

It’s worth noting that certain solar power systems can be equipped with energy storage solutions, such as batteries, that allow for continued power supply during outages. These battery systems store excess energy generated by the solar panels, which can be used when the grid is down. However, this requires additional equipment and planning during the installation of your solar power system.

If you are interested in having backup power during brownouts or blackouts, it is advisable to explore the option of incorporating a battery storage system into your solar power setup. This allows you to store excess solar energy and use it as a backup power source during grid outages.

It’s important to consult with a professional solar installer who can assess your specific needs, provide guidance on suitable backup options, and ensure that your solar power system is installed safely and in compliance with local regulations.