Which season of the year has the highest photovoltaic system power generation?

Why is My Solar Power Plant Generating Less Electricity in Summer Despite Strong Sunlight?Some customers might wonder why their solar power plant generates less electricity in the summer despite the strong and long-lasting sunlight. This concern is quite common and can be explained by several factors. It is important to understand that the amount of electricity generated by a solar power system is not solely determined by sunlight conditions.

The Role of Temperature
The most direct reason for reduced electricity generation in summer is temperature. High temperatures can negatively impact both the solar panels and the efficiency of the photovoltaic inverters.

Impact on Solar Panels:

The peak temperature coefficient for solar panels typically ranges between -0.38% to -0.44% per degree Celsius. This means that as the temperature rises, the power output of the solar panels decreases. Theoretically, for every 1°C increase in temperature, the power output of a solar power plant decreases by approximately 0.5%.
For instance, consider a 275W solar panel with an initial temperature of 25°C. For every 1°C increase, the power output decreases by 1.1W. Thus, in environments with good sunlight but high temperatures, the increased power output due to better sunlight can be entirely offset by the reduction caused by high temperatures.
Impact on Photovoltaic Inverters:

High temperatures can also affect the efficiency of inverters, which are crucial for converting the DC electricity generated by the solar panels into AC electricity usable by the grid.
Seasonal Variation in Solar Power Generation
Spring and Autumn: Solar power plants generate the most electricity during spring and autumn. During these seasons, temperatures are moderate, the air is clearer with fewer clouds, visibility is high, and there is less rain. This combination of factors provides optimal conditions for solar power generation.
Summer: Although sunlight is strong and lasts longer in summer, the high temperatures significantly reduce the efficiency of solar panels, counteracting the benefits of increased sunlight.
Autumn: Particularly in autumn, conditions are often ideal for solar power generation, making it the best time of year for maximum output.
In conclusion, while good sunlight is essential for solar power generation, high temperatures can diminish the benefits. Understanding the impact of temperature on solar panels and inverters can help manage expectations regarding seasonal variations in solar power output. If you have further questions or need professional advice, feel free to contact us!