A matter of prevailing conditions.

If you could select the criteria that the ideal rooftop installation should have to meet, you would probably choose an installation facing south on a roof tilted at an angle that is best suited for sunlight to strike in any season. The environs of this installation would be absolutely free of shade, the air always clear and devoid of impurities from dirt, dust, fog or smog. What‘s more, the weather would always be both sunny and cold because in addition to the above conditions, high solar radiation values and low temperatures offer the best premises for the highest yields.

In other words: An ideal PV installation will always be rare. That‘s because the real world is usually quite different.

Examples for extreme conditions:

Fog
Snow
Twilight

Roofs often face east or west. Trees, chimneys or nearby buildings cast shadows. Pollutants are in the air. The weather fluctuates between high temperatures, fog or clouds and in winter, snow provides a partial covering for the roof. Each of these factors reduces the yield.

 

The solution:
Highest yields - even under extreme conditions.
With CIS PowerModules by Solar Frontier.

This is precisely where the advantages of CIS technology come in. Thanks to their features even under extreme conditions Solar Frontier PowerModules reach high efficiency and therefore highest yields. 

Thanks to the good low-light behavior the CIS modules also work in the early morning and the late evening hours as well as under diffused light conditions given in the case of fog or clouds.

The high shadow tolerance enables a high efficiency rate despite shadows being cast on the modules or their partial coverage due to e.g. falling leaves. Unlike other modules, in case of shadows not the entire module stops producing energy but only the covered area. Thus under partially shaded conditions, the unique patterning of CIS modules keeps the drop of output to a minimum and compared to other modules higher overall output is achieved.

Thanks to their low temperature coefficient even installations in hot temperature regions or during the hot summer period achieve high output levels as the performance loss of CIS modules is smaller than in the case of other technologies.

The fourth reason, the so called Light Soaking Effect, is comparable with the warming up of an engine, reaching its best performance at working temperatures.

These 4 characteristics of CIS technology apply on rooftop applications, free-field power plants as well as in facade application leading to high output levels even under challenging conditions.

The high shadow tolerance has one additional benefit: in free-field application or on flat rooftops it allows a lower distance between the module rows. Thus within a limited area a higher system capacity can be installed.