Solar panels can still work on cloudy days, but their output is reduced compared to sunny days. The sun’s rays still pass through the clouds to provide indirect sunlight. This means that even on cloudy or rainy days, your solar panel system to generate some electricity, although the output will be much less.
Homeowners in the South West of Western Australia understand how often the weather can be overcast. It’s been reported that Bunbury can have over 100 cloudy days over one year (Bureau of Meteorology). That’s why residents must have peace of mind that their solar panel system will continue to perform well when the sun isn’t shining.
How Do Solar Panels Work?
Solar panels work by converting light particles (photons) into electricity. This process is known as the photovoltaic (PV) effect, which is why solar panels are sometimes referred to as PV modules. When photons strike the silicon cell of the panel, they knock electrons free from their atoms and generate an electrical flow. Your solar energy system will continue to work as long as photons are present. This is why solar panels can even produce a small amount of energy before sunrise and after sunset.
How Do Solar Panels Generate Power When It’s Cloudy
PV panels can generate electricity when the sun is hidden behind clouds by capturing diffuse sunlight. This is light that passes through the clouds and scatters in multiple directions. Because fewer light particles reach the panels, less electricity is produced compared to a sunny day. However, they will continue to work.
Factors That Influence Solar Efficiency on Cloudy Days
Not all cloudy days are the same. Several factors influence how much power solar panels can produce in overcast conditions.
- Solar Panel Quality: The type and quality of your panels matter. For example, monocrystalline panels generally are better at capturing sunlight compared to others, even in low-light conditions.
- Cloud Density: Thicker, denser clouds block more sunlight, causing your panels to produce less power.
- Rain: Heavy rain can temporarily reduce solar panel efficiency even further. However, rain can also clean first and grime off rooftop panels and improve their long-term efficiency.
If you’re considering installing solar panels, contact South West Solar Force. Our team will assess your property and find the best solar panel solution for you.
