Sunny times: How heat can reduce the performance of our solar systems!

Sunny times: How heat can reduce the performance of our solar systems!

In times when the sun is once again providing German summer heat, there are many questions about the performance of photovoltaic systems. What about the efficiency of these systems as temperatures rise? The experts from the Baden-Württemberg photovoltaic network, funded by the Ministry of the Environment, provide information: In 2024, the installed capacity of newly built solar power systems was an impressive 2,120 megawatts, even if the heat has its pitfalls. Solar systems work optimally at around 25 degrees Celsius, and every degree more can reduce output by up to 0.4 percent. If the temperature rises to 30 degrees, a loss of around 2 percent can occur, as shown Swabian reported.

What is the reason for this phenomenon? The temperature coefficient for crystalline silicon, one of the most common materials for solar cells, is between -0.3% and -0.5% per degree Celsius. This leads to a number of physical mechanisms that affect the efficiency of the solar cells. The increased probability of recombination of electrons and holes is just one of the effects that occurs at high temperatures. When you talk about solar energy, it quickly becomes clear: optimizing these processes is becoming increasingly important. PV calculation notes that systems in extremely warm regions can suffer dramatic performance losses - over 10 percent at temperatures above 40 degrees Celsius.

The influence of design and choice of materials

A particularly interesting aspect is how the design of equipment and the specific materials used can influence performance. Newer photovoltaic panels are better able to handle heat, but these often come at a higher cost. It is also advisable to avoid using black roof tiles when planning new buildings, as these increase the heat effect. In this context, the Upper Swabian Energy Agency offers free initial consultations for interested parties who live in the districts of Ravensburg, Lake Constance, Sigmaringen and Biberach.

The trained PV scouts offer valuable support, for example when assessing roofs or balconies. They also advise on topics such as subsidies, the use of your own electricity or the integration of electric vehicles. For those who would like to find out more about photovoltaics, comprehensive information and inquiry forms are available on the websites of the Energy Agency and the respective district offices.

Changing technology

The development of technology plays a crucial role in the future of solar energy. Photovoltaic systems consist of a large number of individual solar cells that are combined into modules. In addition to being a frame and plastic, these modules also include a glass cover that protects them from contamination. The conversion of the generated solar energy into usable electricity is done by inverters, which convert the direct current into alternating current. Loud Heat saver The efficiency of the inverter is crucial for the efficiency of energy conversion.

Overall, it shows that the technical challenges when using solar energy are diverse and innovative solutions are required. It remains to be hoped that developments in this area will continue to progress and photovoltaic energy generation will become even more efficient and sustainable.