It’s cloudy, now what?

by | Apr 2, 2024 | Blog | 0 comments

Solar panels can generate electricity on a cloudy day due to their ability to harness diffuse sunlight, albeit at a reduced efficiency compared to sunny conditions. Here’s how it works:
 

  • Diffuse Light: Even on cloudy days, sunlight penetrates through the clouds in the form of diffuse light. While this light is less intense than direct sunlight, it still contains photons (light particles) that can be absorbed by the solar panels.
  •  

  • Photon Absorption: Solar panels are made up of photovoltaic cells, typically composed of semiconductor materials such as silicon. When photons from sunlight strike these cells, they excite electrons within the material, causing them to move and creating an electric current.
  •  

  • Conversion to Electricity: The excited electrons create an imbalance of charges within the material, which results in the flow of electricity. This electricity is in the form of direct current (DC).
  •  

  • Inverter Conversion: The DC electricity generated by the solar panels needs to be converted into alternating current (AC) to be used in most household appliances. This is done by an inverter, which is typically installed alongside the solar panels.
  •  

  • Grid Connection (if applicable): If the solar panel system is grid-tied, any excess electricity generated can be fed back into the grid, and the household can draw electricity from the grid when the solar panels aren’t generating enough power, such as during nighttime or very cloudy days. This helps ensure a constant and reliable supply of electricity.

 
While solar panels are most efficient under direct sunlight, advancements in solar panel technology have improved their ability to generate electricity even in low-light conditions. However, the output will still be significantly lower on cloudy days compared to sunny days.