How Often Should You Inspect Solar Panels for Degradation?

Understanding Solar Panel Degradation

Solar panel degradation refers to the gradual decrease in their efficiency over time. This can be caused by various factors, including exposure to extreme temperatures, humidity, and UV radiation. The rate of degradation varies depending on the quality of the panels, environmental conditions, and maintenance practices.

Determining the Degradation Rate

The degradation rate of solar panels is typically measured by comparing their initial efficiency to their current output. A standard test protocol is to measure the panel’s output after 1,000 hours of operation at a temperature of 25°C. This is known as the “1,000-hour test.” Most high-quality solar panels experience a degradation rate of around 0.5-1% per year, which translates to a 4-8% decrease in efficiency over 10 years.

Identifying Signs of Degradation

During an inspection, look for signs of physical damage, such as cracks, dents, or broken connections. Check the panels’ surface for any dirt, debris, or algae buildup, which can reduce their efficiency. Measure the voltage and current output of each panel to identify any discrepancies. Compare these readings to the manufacturer’s specifications to determine the level of degradation. If you notice a significant decrease in energy production, it may be necessary to replace the panels or perform maintenance to restore their efficiency.