The yield of photovoltaic panels in winter

The yield of photovoltaic panels in winter

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Theperformance of solar panelsit is not at all easy to calculate, there are too many variables to take into account; I can however explain to you how the yield of photovoltaic panels in winter, when events such as fog, rain and cloudy skies are very frequent.

Before I go into it and talk about theyield of photovoltaic panels in winter, I would like to point out that even in the height of summer, efficiency drops may occur, especially for those who live in Southern Italy: solar panels they work best at lower temperatures, around 25 ° C. Higher temperatures significantly reduce the efficiency of the system due to overheating of the photovoltaic modules. For further information, the article dedicated tothermography of solar panels.

If you are considering investing in photovoltaics, it is right to ask yourself about the real yield of this technology. Let's face it right away: it all depends on the quality of the solar panel chosen and the position (and inclination) in which the system is installed.

Photovoltaic system and atmospheric agents: cloudy sky, fog and rain

Thereyield of solar panelsit is greater on sunny days with lower temperatures. In winter, when cloudy days, rains and fog appear, much depends on the sensitivity of your solar system. The Photovoltaic cells of the latest generation are able to offer a good yield even on cloudy days, but most of the plants, in winter, with the presence of clouds and rain, manage to make only 25 - 30% of their normal production.

What should interest those who decide to invest in photovoltaics is not the yield of solar panels in winter, but the overall yield over the year: if in that climatic zone in which you decide to install a solar system there are only a few "covered" days per year, during the four seasons you will be able to meet your energy needs offsetting the decrease given by adverse weather conditions.

Speaking of the sun, in Italy, the areas with the highest values ​​are the coasts of Sardinia, the western and southern coast of Sicily, the whole of Puglia south of Bari and the coastal strips of the southern Tuscan Archipelago. These areas have values ​​of more than 2600 hours of sunshine per year, with an average of more than 7 hours a day. In Italy, two other geographical areas can be identified, an intermediate one which records between 2400 and 2600 hours of sunshine per year (between 6.5 and 7 hours per day) and one with fewer hours of sunshine but which still offers between 2200 and 2400 hours of sunshine per year (between 6 and 6.5 hours per day). With these data it can be said that a domestic photovoltaic system is always convenient.

Those who live in very windy areas should not worry about potential wind damage to solar panels: solar systems, in general, can support wind discharges of up to 120 km / h or even more.

Thereyield of photovoltaic panels in winterit can be affected above all by snow storms: snow blocks energy production because it accumulates on photovoltaic roof preventing the sun's rays from reaching the cells. To remedy the problem, in the areas at risk of snow isolar panelsthey must be installed respecting precise inclinations that prevent the accumulation of snow.

Video: What are the advantages and disadvantages of solar energy? Solar energy. solar panels. Physics (August 2022).