Solar Panel Degradation With Temperature

Solar modules like all electronics are less productive and less efficient in hot temperatures.

Solar panel degradation with temperature.

Temperature is one of most important factors. When solar panels become hot more electrons need space to move. Extreme cold and hot weather humidity and snow and ice also slowly contribute to solar panel degradation as do solar system components with different voltage potentials. Most solar panels have a temperature coefficient of around 0 3 c to 0 5 c.

Solar panel degradation and failure is not a clear cut situation kurtz said. Laboratory experiments at the rivers state university of science and technology at port harcourt nigeria in 2008 found similar results. Note these figures may have a minus sign in front of them as in 0 7 or 0 25. If the surface temperature of your roof increases to 30 c 86 f your solar panel s efficiency will fall to 16 7 percent.

Twenty one companies participated in the damp heat test with degradation. This decreases the amount of voltage that a panel can produce lowering its overall efficiency. For example sunpower s solar panels all have a temperature coefficient of 0 37 c. What this means is that for every 1 c above 25 c sunpower s solar panels decrease in efficiency by 0 37.

For many panels this is given as 2 to 3 in the first year and then 0 7 a year after that but it can be as low as 0 25 a year for some sunpower panels. Solar panel energy production dropped off steadily once the. But as long as your solar system is installed by experts and you re using panels of good quality this shouldn t be a major contributor to degradation. 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.

Modules were held at a constant temperature of 85 celsius and a relative humidity of 85 for 1 000 hours about 42 days. If you have solar panels with an efficiency rating of 17 percent and a temperature coefficient of 0 45 they will lose 0 45 of their efficiency for every degree above 25 c.