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Top 3 Factors to Calculate Solar Panel Efficiency Over Time

Solar panels are a long-term investment in clean, cost-effective energy. But like any technology, their performance can decline over the years. Here are the top three reasons solar panel efficiency drops over time, and how you can tackle them.

Temperature and Thermal Stress

Contrary to popular belief, more sun doesn’t always mean more power.
Excessive heat can actually lower a solar panel’s output. For every 1°C increase above 25°C, panel efficiency drops by 0.3% to 0.5%. Long-term exposure to high temperatures may also cause material fatigue and micro-cracks.

Temperature and Thermal Stress

Insight: high-efficiency modules are engineered for Indian climates, with superior heat tolerance and robust thermal stability.

Dust and Dirt Obstruct Light

Environmental buildup like dust, bird droppings, or pollution can block sunlight from reaching the cells, significantly reducing power output, especially in urban, coastal, or dry areas.

Tip: We recommend periodic cleaning and offer maintenance solutions to ensure your panels stay clean and efficient year-round.

Dust and Dirt Obstruct Light

Ready to see how much you could save with solar? Use our solar calculator to measure your potential ROI before making any decisions.

Degradation with Time

All solar panels degrade, typically losing 0.5% to 0.8% of output annually. Over 25 years, that’s around 15–20%. Contributing factors include UV radiation, moisture, and weather wear.

Advantage: Solar panels are built with premium materials and undergo rigorous testing, ensuring lower degradation rates and longer lifespan.

Conclusion

Heat, dirt, and natural aging are the key reasons behind reduced solar panel efficiency. But with quality equipment and consistent upkeep, these losses can be minimized.

Choose high-performance solar panels designed for durability, backed by industry-leading warranties and expert support.

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