SOLAR IN THE RAIN

So the rainy season is upon us; what does this mean to our solar systems?? Do they still operate optimally and efficiently? What are the advantages and disadvantages of rain on the solar system?

Well to start with solar panels are protected from any “damage” likely to be caused by rain alone as they are water proof. However when it rains; the sun rays are partially “blocked” from striking the panels directly. If you refer to our earlier posts; most of the panel’s source of power production is from this direct sunshine. However the panels will still work as the sun rays will eventually find their way to the solar panels in what is called “diffuse radiation”. This results in reduced production in days of rainfall and clouds. It is crucial that from the onset; the system is sized to cater for such conditions. If your system is 100% solar and not connected to any electricity from the grid (ZESA); it would be prudent to then have a big array of panels and battery storage of 2-3 days to cover for such periods of rain and cloud (though these are very few throughout the year for the Zimbabwean climate)

Disadvantages of rain: As mentioned earlier; there is less direct radiation; thus less production. Rain also usually comes with the danger of lightning; particularly in the Zmbabwean climate; which poses a danger to the solar system. This makes it absolutely crucial to have lightning protection installed on your system. Please kindly refer to our posts on Lightning Protection

Advantages of rain: : when rain falls upon your panels it helps clean them of dust and dirt which if left on panel; can significantly reduce performance of the panels. Thus when it rains the panel gets cleaned and performance improves

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About Author:

Lovewell Chitiyo is a Mechanical Engineer with 15 years experience in the building services Engineering consultancy, renewable energy systems and sustainable design fields. He is currently studying Masters in Renewable Energy at Stellenbosch University in South Africa

Lovewell is an Accredited Professional with the Green Building Council of South Africa for Existing Buildings Performance and New Buildings; Interiors, holding several qualifications and certification in Renewable Energy and Sustainability.

Lovewell also has vast experience in design, supervision, installation and commissioning of several projects locally and regionally in the last 15 years.