Renewable energy has been the subject of years of research and development by scientists and engineers around the world. The goal is to improve technological efficiency and make clean energy competitive with fossil fuels, especially in the context of the energy transition. Each type of renewable energy has its advantages and disadvantages, and the challenge lies in finding methods to improve these technologies.
One field that has seen significant advances in recent years is solar energy. Scientists from two Chinese universities have unveiled a revolutionary breakthrough in solar panels that could generate power even in adverse conditions such as cloudy days, rain, fog and even at night. This breakthrough could change the way we perceive solar energy and its performance in situations with low solar radiation. But what exactly does this development mean for the future of solar energy?
Dream solar panels
The performance of solar panels has traditionally been determined by the amount of solar radiation. On sunny days, performance is optimal, but in adverse weather conditions such as clouds, rain or fog, energy production is considerably reduced. This has been one of the main challenges to overcome in order for solar energy to be more competitive and sustainable.
The problem becomes more pronounced in countries or regions where direct sunlight is limited for a large part of the year. This is the case in many areas of northern Europe, where low solar radiation conditions affect the performance of traditional photovoltaic systems. The same is true in warmer areas, where rain and fog can be factors.
With solar panels developed by Chinese universities, this problem could be solved. These panels not only generate energy with direct sunlight, but can also operate with indirect radiation and low luminosity. In this way, a constant and more stable supply of energy can be guaranteed on cloudy days or even at night.
New material that absorbs a lot of sunlight
The key material behind this breakthrough is called LPP (which stands for “long persistence phosphorus”). This material is capable of storing solar energy during the day and releasing it at night, allowing the panels to continue generating electricity.
LPP is capable of absorbing and storing energy from light that is not visible to the human eye, such as photons in the near-infrared spectrum. While traditional photovoltaic technologies only capture visible light, LPP allows solar panels to take advantage of a broader portion of the electromagnetic spectrum. This means that these panels can generate electricity even in low-solar conditions.
This ability to absorb light beyond the visible spectrum is crucial for performance at night or on cloudy days, as infrared radiation is still present, even if it is not perceived by the human eye. Thanks to LPP material, solar energy could be more efficient and reliable in regions prone to phenomena such as fog or rain. In essence, this technology allows solar panels to have a constant performance, regardless of weather conditions.
Operation on cloudy days and adverse conditions
A common question among those considering installing solar panels is how the weather affects their performance. Sunny days are best for energy harvesting, but many are surprised to learn that even on cloudy days, solar panels can still generate electricity. Solar panels, including conventional ones, can absorb scattered light that reflects off clouds. It is true that they do not reach 100% of their maximum capacity in these conditions, but it is estimated that they can still produce between 10% and 25% of the energy they would generate on a clear day.
This output range can vary depending on the thickness of the clouds and the amount of filtered sunlight. High clouds, for example, allow more radiation to pass through than low, thick clouds, which influences the amount of energy the panels can collect. In places like northern Spain, where cloudy days are common, solar output may be reduced, but it doesn't mean the panels stop working.
Adaptation to cold and snowy climates
Solar panel performance is also affected by temperature. It may seem surprising, but cold climates are actually beneficial for photovoltaic systems. As the temperature rises above 25°C, the efficiency of a solar panel decreases. Conversely, the colder the ambient temperature, the better the panels will perform, as long as they are not covered by snow.
In regions where snow covers solar panels, it is important to ensure that the snow is properly removed. Although the snow itself can reflect sunlight back to the panels and contribute to an increase in energy harvest, the covered panels will not be able to absorb light until the obstacle is removed. Additionally, a good angle when installing the solar panels can help the snow slide off automatically.
How does rainfall affect performance?
Contrary to popular belief, rain does not negatively affect the performance of solar panels. In fact, frequent rainfall can be an advantage, as it cleans the panel surface of dust and dirt, improving its performance by exposing it more directly to sunlight.
Innovations such as LPP materials promise to further improve efficiency in these cases, by ensuring that even in diffuse light, the panels continue to generate energy. This positions solar panels as one of the most viable options, even in climates where direct sun is not guaranteed for most of the year.
Technological conclusion
The development of these solar panels is a significant advance for the renewable energy sector. By allowing electricity to be generated in low-radiation conditions or even at night, it greatly expands the possibilities for using solar energy in different environments, including areas with less favorable climates. This type of innovation continues to move the balance towards a cleaner and more sustainable future, reducing our dependence on fossil fuels.
With new technologies such as solar panels that operate in low radiation or even at night, the horizon for photovoltaics is very encouraging. The promise of more stable and reliable energy under any weather conditions is a crucial step towards a future where renewables can cover a greater part of our energy needs.