Solar Panels Degradation Explained

Solar panels are a durable and efficient source of renewable energy, designed to last decades. However, their efficiency gradually declines over time due to various factors. This decline, known as the degradation rate, measures the annual reduction in a solar panel’s ability to produce electricity.

What is Degradation Rate?

The degradation rate is the percentage decrease in a solar panel’s efficiency each year compared to its original capacity.
It directly impacts the amount of energy a solar panel can generate over its lifetime.
Modern solar panels are designed to minimize this rate to maintain long-term performance.

How Solar Panels Degrade Over Time

Initial Efficiency: In first year most solar panels experience a 1-1.5% drop in efficiency during the first year as they adjust to environmental conditions.
Normal Adjustment: This initial decrease is a normal process as the panels stabilize, and it doesn’t affect long-term performance.
Annual Degradation: After the first year, panels degrade at a rate of around 0.5% per year, which gradually slows down.
30-Year Lifespan: By the end of their 25-30 year lifespan, most panels retain 80-85% of their original efficiency, ensuring long-term energy generation.

Factors Affecting Degradation

Quality of Materials: High-quality panels have lower degradation rates compared to cheaper alternatives.
Environmental Conditions: Harsh climates (e.g., extreme heat, cold, or hail) can accelerate wear and tear.
Maintenance: Regular cleaning and inspection can minimize efficiency losses caused by dirt, debris, or damage.

Typical Degradation Rates by Panel Type

Monocrystalline Panels:
- Degradation rate: 0.3-0.5% per year.
- Known for higher durability and efficiency.
Polycrystalline Panels:
- Degradation rate: 0.5-0.8% per year.
- Slightly less efficient but cost-effective.
Thin-Film Panels:
- Degradation rate: 0.8-1% per year.
- More prone to efficiency loss due to their lightweight design.

How to Minimize Degradation

Choose High-Quality Panels: Invest in panels from reputable manufacturers with low degradation rates.
Regular Maintenance: Clean panels periodically to remove dirt, dust, and debris that block sunlight.
Optimal Installation: Ensure panels are installed at the correct angle and securely mounted to avoid stress or wear.
Environmental Protection: Use protective coatings or covers in areas prone to extreme weather.
Monitoring Systems: Install performance monitoring systems to track efficiency and address issues promptly.

Conclusion

Solar panels, despite gradual efficiency loss, remain a reliable energy source for decades. Understanding degradation rates and taking proactive measures can maximize their performance. Schedule a call to know more about solar.