Snow makes skiers happy, but it can bring down the yield of photovoltaic installations. The days get shorter, the hours of exposure to sunlight are reduced and the performance of the modules decreases.
If the changing of the seasons is a completely normal thing, and impossible to avoid, other factors that affect the performance of photovoltaic structures, such as a dense layer of snow or intense cloud cover, can be governed. Here are the manufacturer's recommendations Canadian Solar to maintain high performance of solar panels.
A careful control of the photovoltaic system it can help ensure maximum system efficiency, especially in the winter months. For example, when the inverter operating signal flashes, the conditions for the energy production they are not optimal.
The causes can be different: snow deposited on the surface of the module, intense cloudiness or unwanted shadows. In all these situations renewable energy produced is unable to power the system and cannot be used.
The best solution is to be patient. Attempting to thaw even only part of the hedge created will not bring any benefits because the energy used for this process will be higher than the yield obtained. When the weather improves, the sun will naturally melt the snow or ice that has formed since the early hours of the morning.
At the same time, the uncovered areas of the modules will extend their heat to the rest of the surface while continuing the defrosting process. Even the inclination of the modules can contribute to a quick elimination of ice or snow, the ideal slope is greater than 30 °.
It is always good to remember that any attempt to manually remove snow and frost or the use of de-icing sprays and salt can cause damage to the modules and the support substructure of the system.
Always good advice is to do reliance on performing panels which can withstand extreme temperatures without sensing any power loss (refer to IEC 61615 standard) and withstand loads up to 5,400 Pa on the front.