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Cielo Este » Cielo Sol » Applications

22. Preventing reduction of efficiency in photovoltaic panels


Nowadays a lot of buildings and equipment use photovoltaic panels to provide part of the electricity consumed.

The output power and the efficiency of the panels are related to its temperature and its temperature is related to the environment and the sunlight. Maximum efficiency of photovoltaic panels in standard conditions (25 Celsius degrees, 1000 w/m2 radiation and 1 m/s wind) is around 20%.

This low number on the other hand will reduce 0.2 to 0.5 % per each Celsius degree of temperature rise.

In other words if the panels’ temperature rises by 10 degrees, the efficiency will decrease 2 to 5%.

So the darkness of photovoltaic panels and therefore the increase in their temperature during sun exposure is a big problem in their utilisation.

In addition, temperature rises will shorten the cells’ life in the long term.

For this matter, a combination of phase change materials and photovoltaic panels will stabilise and maintain temperatures to prevent a reduction in the efficiency.

The melting point of the PCMs used for this purpose depends on climate and radial conditions and varies from 20 to 60 Celsius degrees.







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