Why Do Solar Panels Degrade Over Time

There are lots of different reasons why they degrade and why they fail kurtz said module manufacturers are looking into every piece of the solar panel puzzle all the way down to the encapsulants and adhesion materials to try to slow degradation rates.

Why do solar panels degrade over time.

Degradation rates are used in solar site assessments in order to estimate the energy production over the life of a system and to calculate the payback period and return on investment. While solar panel degradation is not ideal a good quality solar panel will have low degradation rates that won t affect the performance of your system too greatly. A variety of external factors like weather wear down on the panels and have a negative impact on their ability to produce electricity. How and why does this happen.

Solar panel degradation refers to when a solar panel loses its power output over time. Light induced degradation or lid affects most solar panels and reduces their efficiency by 1 3 during the first few hours they are exposed to sunlight. This link outlines several modes of solar panel degradation and this report by the national renewable energy lab is a very detailed review of studies on solar panel degradation worldwide. Below is a comparison of the output of solar power systems over a 50 year period with degradation rates of 0 25 sunpower s expected average 0 4 an excellent rate of degradation 0 8 the mean average found in some studies and 1 the old standard.

It does because yearly degradation compounds over time. Solar panel degradation and failure is not a clear cut situation kurtz said. What exactly is reducing their efficiency. Solar site assessors use these rates.

For example solarcity the largest residential solar installer in the u s guarantees that its panel efficiency won t degrade below an 80 efficiency rating over a 20 year power purchase. For most tier 1 solar panels the degradation rate is 30 meaning that each year the panels performance is reduced by 30. All solar panels slowly degrade over time which means they re producing less electricity from the same amount of sunlight. The reason why they allow for extra degradation early on is not because panels degrade rapidly in their first year.

Solar panel degradation rates are constantly improving as solar panel technology gets better over the years and degradation rates below 1 are common throughout the industry. Why do they degrade. Those panels could retain 96 of their production capabilities after 20 years. Internal resistance of the cell can increase due to infiltration of contaminants usually water vapor when the encapsulating.

Over 25 years that adds up to a total of 6 96 meaning your panels will operate at 93 04 of their original capacity in 2045.