Do Solar Panels Work When It's Cloudy

Raj Singh
July 26, 2023

Solar panels have gained immense popularity recently due to their ability to generate clean and renewable energy. However, many homeowners are concerned about solar panels' effectiveness on cloudy days. This article will explore whether solar panels can work efficiently when the sun hides behind clouds. We will also discuss the best types of panels for cloudy days and tips to improve their efficiency. So, let's dive in and shed some light on this topic.

How Cloudy Days Affect Solar Energy Generation

Now let's address the question: do solar panels work when it's cloudy? The simple answer is yes; solar panels can still generate electricity on cloudy days. However, their efficiency and power output are reduced compared to sunny days.

Cloudy conditions affect the amount of sunlight reaching the solar panels. Since solar cells absorb sunlight to generate electricity, reduced sunlight intensity can lead to lower energy production. Solar panels typically operate at around 25% of their optimal capacity on an average overcast day.

It's important to note that solar panels do not rely solely on direct sunlight. They can still produce electricity using indirect sunlight or diffused light. This means solar panels can still generate power even when the light gets reflected because of rain or partially blocked by clouds.

The 'Edge-of-Cloud Effect' and Its Impact

Interestingly, cloudy conditions can sometimes lead to a phenomenon known as the 'Edge-of-Cloud Effect.' When the sun's rays break through a cloud, they can become magnified, resulting in higher electrical output than under normal conditions. However, this sudden burst of high electricity generation can cause issues such as blowing fuses and potentially decreasing the inverter's lifespan.

Best Solar Panels for Cloudy Days

While all solar panels can work on cloudy days, certain types perform better than others. The three main types of solar panels available are Monocrystalline PV, Polycrystalline PV, and Amorphous (or Thin Film) panels.

Of these options, Monocrystalline PV panels are considered the most efficient for generating electricity on cloudy days. These panels have high-quality silicon, and their single-crystal structure allows electrons to flow more freely, resulting in higher electricity production per square area. Monocrystalline panels also have better resistance to heat fluctuations and longer lifespans.

However, it's worth noting that Monocrystalline panels are typically more expensive due to the higher quality materials and complex manufacturing processes involved. Polycrystalline and Amorphous panels are also viable options and offer advantages in terms of cost and flexibility.

Solar Panels and Nighttime Energy Generation

Solar panels require sunlight, so they do not produce power at night. However, you'll still need electricity during the night. Using batteries, such as solar battery storage systems, allows you to store excess energy generated during the day for use at night.

Coupling solar panels with battery storage gives you a continuous electricity supply even when the sun isn't shining. This provides power during the night and enables you to rely less on the grid during peak hours, saving you money on electricity bills.

Solar Panels and Shade

Shade can affect the efficiency of solar panels, so it's important to ensure they receive as much direct sunlight as possible. Even partial shading, such as from trees or nearby buildings, can cause certain cells in the solar panel to produce less power than others. This can result in a decrease in overall panel efficiency.

To maximise the power output of your solar panels, it's crucial to keep them free from shade. Regularly trimming trees and removing potential obstructions helps ensure optimal sunlight exposure and maximise energy production.

Solar Panels and Snowy Days

Solar panels can still operate effectively on snowy days as long as a thick layer of snow does not cover them. A light dusting of snow typically has minimal impact on solar panel performance. However, snow accumulating and covering the panels can reduce their conversion efficiency by more than 5% or even create hot spots due to shading.

In areas with heavy snowfall, installing solar panels with a larger inclination angle is advisable. This allows the snow to slide off more easily, minimising its effect on the panels' efficiency. Mounting the panels higher can also help prevent snow buildup.

Tips to Improve Solar Panel Efficiency on Cloudy Days

While solar panel technology continues to advance, there are several steps you can take to improve their efficiency on cloudy days:

  • Optimal location: Ensure your solar panels adjust in a location that maximises their exposure to sunlight. Consider factors such as the sun's trajectory throughout the day and any potential sources of shade.
  • Proper angle: Adjust the angle of your solar panels to optimise their tilt. The ideal angle will depend on your location and the time of year. Closer proximity to the equator may require steeper angles.
  • Obstruction removal: Regularly trim trees and remove objects that may cast shadows on your solar panels. This will allow them to receive uninterrupted sunlight and maximise energy production.
  • Regular cleaning: Keep your solar panels clean by washing them with water and a non-abrasive sponge. This will remove any dust, dirt, or debris that may accumulate and hinder their performance.


Solar panels can work on cloudy days, albeit with reduced efficiency compared to sunny conditions. They can still generate electricity using indirect sunlight or diffused light. Opting for high-quality Monocrystalline PV panels can improve performance on cloudy days. Additionally, considering panel location, angle, and maintenance can enhance solar panel efficiency. So, whether it's a cloudy or sunny day, solar panels remain a reliable and sustainable energy source for homeowners.

If you are considering installing solar panels in Clare, Galway, Limerick, or Tipperary and looking for the best solar PV installation services, reach out to Nusolas Energy. The Nusolas offers top-notch solar installation services for residential, commercial, agriculture, and even education firms. Take the first step towards a greener future by harnessing the sun's power with Nusolas. Contact us today to learn more and schedule your solar panel installation.

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Frequently Asked Questions

Can solar panels generate electricity on cloudy days?

Solar panels can still generate electricity on cloudy days, although their energy output will be lower.

Do solar panels work at night?

No, solar panels require sunlight to generate electricity. However, battery storage systems can provide power during the night.

Do solar panels work in the shade?

Solar panels require direct sunlight for optimal performance. Shade from trees or buildings can reduce their efficiency.

Can solar panels function in snowy conditions?

On snowy days, solar panels can still function properly if the snow is not completely covering them.

What are the best solar panels for cloudy days?

Monocrystalline PV panels are the most efficient for generating electricity in cloudy conditions.

How can I improve the efficiency of my solar panels on cloudy days?

Ensure optimal location, proper panel angle, obstruction removal, and regular cleaning to maximise efficiency.

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*FYI, parts of this blog post were drafted by artificial technlogy. But rest assured, it's been thoroughly researched, edited, reviewed and me & my team.
About Author
Raj Singh

A seasoned professional in the solar industry, Raj Singh is dedicated to illuminating Ireland with the power of the sun. His passion for renewable energy and commitment to sustainability shine through his work in the solar industry.