How long does it take for solar panels to lose efficiency?

solar panel efficiency loss

Solar panels are designed to be durable as well as long-lasting, with most manufacturers guaranteeing their efficiency for at least 25 years. However, over time, we can see that there is a solar panel efficiency loss in any system. The rate at which solar panels lose efficiency can vary depending on several factors, including the quality of the solar panels, the climate in which they are installed, and the maintenance and care they receive.

Throughout this article, we are going to provide you with the reasons why solar panels lose efficiency over time and how to avoid efficiency loss.

Solar panel degradation per year

As we know, solar panels become less efficient over time, and the rate is totally different since there are many factors affecting them. Typically speaking, solar panels will lose around 0.5% of their efficiency each year. This means that after 25 years, a solar panel system may be operating at around 75-80% of its original efficiency. However, some high-quality panels have been shown to lose as little as 0.25% efficiency per year, while lower-quality panels may lose 1% or more per year. Regular maintenance and cleaning are among the ways you can help slow the degradation of solar panels over time.

Panel type

Degradation rate Reduction over 25 years

Amount of original output after 25 years


0.30% 6.96% 93.04%
NO.2 0.50% 11.33%



0.80% 17.53%



Factors that affect the solar panel efficiency loss

loss efficiency of solar panels

One of the biggest factors contributing to solar panel efficiency loss is the accumulation of dirt, dust, and other debris on the panels. This can block sunlight from reaching the solar cells and reduce the amount of energy they can produce. Regular cleaning of the panels can help prevent this build-up and ensure that they continue to operate at maximum efficiency.

In addition to dirt and debris, other environmental factors can also impact the efficiency of solar panels. For example, extreme temperatures can cause the materials in the panels to expand and contract, leading to cracks or other damage that can affect their performance. Similarly, hail, high winds, and other weather events can cause physical damage to the panels that may reduce their efficiency. To get more information about Growatt Hybrid inverter dubai efficiency, you can call us.

7 ways to prevent the destruction of the solar panel

Over time, solar panels can lose efficiency due to various factors such as dirt, debris, and wear and tear. In order to avoid such occurrences, we have provided you with a list to help you in decreasing the solar panel efficiency loss.

1- Regular cleaning:

Dust, dirt, and other debris can accumulate on the surface of the solar panels, reducing their efficiency. Cleaning the panels regularly, particularly in dusty or polluted environments, can help maintain their efficiency. By keeping the panels clean and free from any obstructions, they can continue to function at their optimal capacity. This can be done by gently washing the panels with water and a mild detergent, removing any build-up of dirt or grime that may be blocking the sunlight from being absorbed.

2- Monitoring for shading:

Even small amounts of shading on the panels can significantly reduce their efficiency rate. Regularly monitoring for shading from trees, buildings, or other obstructions, trimming any overhanging branches, or adjusting the panel placement as necessary can help avoid efficiency loss.

3- Proper installation:

Ensuring that solar panels are properly installed and angled correctly to maximize sunlight exposure can prevent efficiency loss over time. Remember that proper installation includes positioning the panels at the correct angle and direction to maximize sun exposure, as well as securing them in a stable and secure manner. All the inverters like Off grid inverter needs proper installation.

4- Periodic inspection and maintenance:

solar panels to lose efficiency

Regularly inspecting solar panels for signs of damage or wear, such as cracks, discolouration, or loose connections, and addressing any issues promptly can help maintain their efficiency.

5- Inverter maintenance:

Inverters are components that convert the direct current (DC) energy generated by the solar panels into usable alternating current (AC) electricity. Regularly checking and maintaining inverters can prevent efficiency loss in solar panels.

6- Avoid extreme temperatures:

Solar panels function most efficiently in moderate temperatures. Excessive heat can reduce their efficiency, while extreme cold can affect their performance. Ensuring proper ventilation and insulation of solar panels can help maintain their efficiency.

7- Upgrading older panels:

Over time, advances in solar panel technology can make older panels less efficient. Upgrading to newer, more efficient panels can help maintain or even improve energy production over time.

Keep in mind that by taking these proactive steps and investing time and effort in maintaining and monitoring the solar panel system, it is possible to avoid significant efficiency loss and prolong the lifespan of the panels.

Bestseller company of Growatt inverters

Overall, while solar panels will gradually lose some of their efficiency over time, with proper care and maintenance, they can continue to produce clean, renewable energy for decades. By choosing high-quality panels, installing them in a suitable location, and regularly cleaning and servicing them, homeowners can make sure that their solar panel system continues to operate at the maximum efficiency for many years to come. growatt inverters dubai have a high quality which are suitable for houses and business.

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