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African penguins at Boulder Beach in Simons Town near Cape Town, South Africa in 2013. Wolfgang Kaehler / LightRocket via Getty Images

The mysterious deaths of 63 endangered African penguins are being attributed to an unusual cause — bee stings.

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EcoWatch Daily Newsletter
The United Nations headquarters (C) amid the skyline of New York City where the high-level 76th session of the UN General Assembly is taking place on Sep. 20, 2021. ED JONES / AFP via Getty Images
Stark warnings abound as world leaders gather for the UN General Assembly this week.
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MAXSHOT / iStock / Getty Images

Solar panels allow you to harness the sun's clean, renewable energy, potentially cutting your electric bills as well as your environmental footprint. But do solar panels work on cloudy days, or during seasons of less-than-optimal sun exposure? For homeowners who live outside of the Sun Belt, this is a critical question to consider before moving ahead with solar panel installation.

In this article, we'll go over how solar panels work on cloudy days, whether solar panels work at night, and how to ensure you always have accessible power — even when your panels aren't producing solar energy.

How Solar Panels Work on Cloudy Days

Photovoltaic (PV) solar panels can use both direct and indirect sunlight to generate electrical power. This means they can still be productive even when there is cloud coverage. With that said, solar panels are most efficient and productive when they are soaking up direct sunlight on sunny days.

While solar panels still work even when the light is reflected or partially obstructed by clouds, their energy production capacity will be diminished. On average, solar panels will generate 10 to 25% of their normal power output on days with heavy cloud coverage.

With clouds usually comes rain, and here's a fact that might surprise you: Rain actually helps solar panels work more effectively. That's because rain washes away any dirt or dust that has gathered on your panels so that they can more efficiently absorb sunlight.

Do Solar Panels Work at Night?

While solar panels can still function on cloudy days, they cannot work at night. The reason for this is simple: Solar panels work because of a scientific principle called the photovoltaic effect, wherein solar cells are activated by sunlight, generating electrical current. Without light, the photovoltaic effect cannot be triggered, and no electric power can be generated.

One way to tell if your panels are still producing energy is to look at public lights. As a general rule of thumb, if street lamps or other lights are turned off — whether on cloudy days or in the evening — your solar panels will be producing energy. If they're illuminated, it's likely too dark out for your solar panel system to work.

Storing Solar Energy to Use on Cloudy Days and at Night

During hours of peak sunlight, your solar panels may actually generate more power than you need. This surplus power can be used to provide extra electricity on cloudy days or at night.

But how do you store this energy for future use? There are a couple of options to consider:

You can store surplus energy in a solar battery.

When you add a solar battery to your residential solar installation, any excess electricity can be collected and used during hours of suboptimal sun exposure, including nighttime hours and during exceptionally cloudy weather.

Batteries may allow you to run your solar PV system all day long, though there are some drawbacks of battery storage to be aware of:

  • It's one more thing you need to install.
  • It adds to the total cost of your solar system.
  • Batteries will take up a bit of space.
  • You will likely need multiple batteries if you want electricity for more than a handful of hours. For example, Tesla solar installations require two Powerwall batteries if your system is over 13 kilowatts.

You can use a net metering program.

Net metering programs enable you to transmit any excess power your system produces into your municipal electric grid, receiving credits from your utility company. Those credits can be cashed in to offset any electrical costs you incur on overcast days or at night when you cannot power your home with solar energy alone.

Net metering can ultimately be a cost-effective option and can significantly lower your electricity bills, but there are a few drawbacks to consider, including:

  • You may not always break even.
  • In some cases, you may still owe some money to your utility provider.
  • Net metering programs are not offered in all areas and by all utility companies.

Is Residential Solar Right for You?

Now that you know solar panels can work even when the sun isn't directly shining and that there are ways to store your energy for times your panels aren't producing electricity, you may be more interested in installing your own system.

You can get started with a free, no-obligation quote from a top solar company in your area by filling out the 30-second form below.

FAQ: Do Solar Panels Work on Cloudy Days?

How efficient are solar panels on cloudy days?

It depends on the panels, but as a rule of thumb, you can expect your solar panels to work at 10 to 25% efficiency on cloudy days.

How do solar panels work when there is no sun?

If there is literally no sunlight (e.g., at night), then solar panels do not work. This is because the photovoltaic effect, which is the process through which panels convert sunlight into energy, requires there to be some light available to convert.

However, you can potentially use surplus solar power that you've stored in a battery. Also note that solar panels can work with indirect light, meaning they can function even when the sun is obscured by cloud coverage.

Do solar panels work on snowy days?

If there is cloud coverage and diminished sunlight, then solar panels will not work at their maximum efficiency level on snowy days. With that said, the snow itself is usually not a problem, particularly because a dusting of snow is easily whisked away by the wind.

Snow will only impede your solar panels if the snowfall is so extreme that the panels become completely buried, or if the weight of the snow compromises the integrity of your solar panel structures.

Will my solar panels generate electricity during cloudy, rainy or snowy days?

Cloudy days may limit your solar panel's efficiency, but you'll still be able to generate some electricity. Rainy days can actually help clean your panels, making them even more effective. And snowy days are only a problem if the snow is so extreme that the panels are totally submerged, without any part of them exposed to the sun.

Bobbie Renfro, a sponge restoration specialist, toasts Kylie Smith, a coral restoration expert, before a sponge outplanting scuba dive in the Florida Keys. Tiffany Duong / Ocean Rebels

We've all heard about SpongeBob SquarePants, the mischievous yellow sponge cartoon character who lives in a pineapple on the seafloor. Now, meet Bobbie "Sponge Bobbie" Renfro, a Ph.D. candidate at Florida State University in biological sciences and coral reef ecology, with a specialty in sponges, naturally!

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Extinction Rebellion protesters join the March for Nature on Sept. 4, 2021 in London, England. Rob Pinney / Getty Images

By Lorena Gonzalez and Nate Shelter

World leaders are gathering in New York this week and next for the UN General Assembly meeting (UNGA76) and Climate Week. The two major events come at a critical moment for climate action.

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On August 9, the Intergovernmental Panel on Climate Change (IPCC) released the first part of its sixth assessment of the climate crisis. Years in the making, the report once again warned the world of our dire circumstances. Within the nearly 4000 page breakdown of the physical science driving climate chaos lies a particularly disturbing section. One that illuminates just what's at stake if we continue on the path of unhindered extraction and emissions. This is the story of tipping points: what they are, when they will happen, and what actions we can take now to stop drastic domino effects in the future.

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The General Sherman Tree in Sequoia National Park, California. rabbit75_ist / iStock / Getty Images Plus

Firefighters in California are using blankets to protect iconic sequoias — including the world's largest tree — from approaching wildfires.

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Maryna Terletska / Moment / Getty Images

Let's state the obvious: Your favorite time of the month isn't when you get your period. The cramps don't help, but buying loads of pricey products isn't a blast, either. But another aggravation arises for those who try to live sustainable lives: the environmental cost.

According to multiple sources, North American women are believed to use — and, subsequently, dispose of — 12 billion single-use menstrual pads and tampons every single year.

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EcoWatch writer Tiffany Duong holds up discarded fishing line removed from a coral reef head during a Dive Against Debris. Sara Nilsson / Ocean Rebels

PADI (Professional Association of Scuba Divers) is inviting you to dive in (literally) to make positive changes for our ocean. The scuba diving behemoth and PADI AWARE Foundation, a non-profit public charity driving change for our ocean at the local level, are celebrating the fourth annual AWARE Week from Sept. 18 - 26 this year.

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MAXSHOT / iStock / Getty Images

Solar panels allow you to harness the sun's clean, renewable energy, potentially cutting your electric bills as well as your environmental footprint. But do solar panels work on cloudy days, or during seasons of less-than-optimal sun exposure? For homeowners who live outside of the Sun Belt, this is a critical question to consider before moving ahead with solar panel installation.

In this article, we'll go over how solar panels work on cloudy days, whether solar panels work at night, and how to ensure you always have accessible power — even when your panels aren't producing solar energy.

How Solar Panels Work on Cloudy Days

Photovoltaic (PV) solar panels can use both direct and indirect sunlight to generate electrical power. This means they can still be productive even when there is cloud coverage. With that said, solar panels are most efficient and productive when they are soaking up direct sunlight on sunny days.

While solar panels still work even when the light is reflected or partially obstructed by clouds, their energy production capacity will be diminished. On average, solar panels will generate 10 to 25% of their normal power output on days with heavy cloud coverage.

With clouds usually comes rain, and here's a fact that might surprise you: Rain actually helps solar panels work more effectively. That's because rain washes away any dirt or dust that has gathered on your panels so that they can more efficiently absorb sunlight.

Do Solar Panels Work at Night?

While solar panels can still function on cloudy days, they cannot work at night. The reason for this is simple: Solar panels work because of a scientific principle called the photovoltaic effect, wherein solar cells are activated by sunlight, generating electrical current. Without light, the photovoltaic effect cannot be triggered, and no electric power can be generated.

One way to tell if your panels are still producing energy is to look at public lights. As a general rule of thumb, if street lamps or other lights are turned off — whether on cloudy days or in the evening — your solar panels will be producing energy. If they're illuminated, it's likely too dark out for your solar panel system to work.

Storing Solar Energy to Use on Cloudy Days and at Night

During hours of peak sunlight, your solar panels may actually generate more power than you need. This surplus power can be used to provide extra electricity on cloudy days or at night.

But how do you store this energy for future use? There are a couple of options to consider:

You can store surplus energy in a solar battery.

When you add a solar battery to your residential solar installation, any excess electricity can be collected and used during hours of suboptimal sun exposure, including nighttime hours and during exceptionally cloudy weather.

Batteries may allow you to run your solar PV system all day long, though there are some drawbacks of battery storage to be aware of:

  • It's one more thing you need to install.
  • It adds to the total cost of your solar system.
  • Batteries will take up a bit of space.
  • You will likely need multiple batteries if you want electricity for more than a handful of hours. For example, Tesla solar installations require two Powerwall batteries if your system is over 13 kilowatts.

You can use a net metering program.

Net metering programs enable you to transmit any excess power your system produces into your municipal electric grid, receiving credits from your utility company. Those credits can be cashed in to offset any electrical costs you incur on overcast days or at night when you cannot power your home with solar energy alone.

Net metering can ultimately be a cost-effective option and can significantly lower your electricity bills, but there are a few drawbacks to consider, including:

  • You may not always break even.
  • In some cases, you may still owe some money to your utility provider.
  • Net metering programs are not offered in all areas and by all utility companies.

Is Residential Solar Right for You?

Now that you know solar panels can work even when the sun isn't directly shining and that there are ways to store your energy for times your panels aren't producing electricity, you may be more interested in installing your own system.

You can get started with a free, no-obligation quote from a top solar company in your area by filling out the 30-second form below.

FAQ: Do Solar Panels Work on Cloudy Days?

How efficient are solar panels on cloudy days?

It depends on the panels, but as a rule of thumb, you can expect your solar panels to work at 10 to 25% efficiency on cloudy days.

How do solar panels work when there is no sun?

If there is literally no sunlight (e.g., at night), then solar panels do not work. This is because the photovoltaic effect, which is the process through which panels convert sunlight into energy, requires there to be some light available to convert.

However, you can potentially use surplus solar power that you've stored in a battery. Also note that solar panels can work with indirect light, meaning they can function even when the sun is obscured by cloud coverage.

Do solar panels work on snowy days?

If there is cloud coverage and diminished sunlight, then solar panels will not work at their maximum efficiency level on snowy days. With that said, the snow itself is usually not a problem, particularly because a dusting of snow is easily whisked away by the wind.

Snow will only impede your solar panels if the snowfall is so extreme that the panels become completely buried, or if the weight of the snow compromises the integrity of your solar panel structures.

Will my solar panels generate electricity during cloudy, rainy or snowy days?

Cloudy days may limit your solar panel's efficiency, but you'll still be able to generate some electricity. Rainy days can actually help clean your panels, making them even more effective. And snowy days are only a problem if the snow is so extreme that the panels are totally submerged, without any part of them exposed to the sun.

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Emory University School of Medicine in Atlanta, Georgia. Sinan / CC BY 2.0

By YCC Team

Climate change increases the risks of many health problems, such as heat stroke and asthma.

"Despite this... my peers and I, as we sat in our first-year medical school lecture halls, we really heard no mention of this whatsoever," says Emaline Laney, a student at the Emory University School of Medicine.

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Polar bear family and cubs from arctic village Kaktovik in Alaska. Piriya Photography / Getty Images

By Jessica Corbett

A coalition of conservation groups sued the Biden administration on Thursday over the U.S. Department of the Interior's recent rule allowing fossil fuel companies to harass polar bears and walruses while searching and drilling for oil and gas in the Southern Beaufort Sea.

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Robert Ingelhart / iStock / Getty Images

Solar power represents one of the best, most reliable forms of renewable energy. Homeowners who install solar panels can harness the sun's energy and convert it to usable electric current. In the process, they can curb or even eliminate their dependence on utility companies, and dramatically scale back their ecological impact.

Solar energy tends to be most advantageous in states that get consistent sun exposure year-round, such as Utah. Naturally, communities throughout the Beehive State have shown an admirable commitment to solar power. According to the Solar Energy Industries Association, Utah installed the tenth-most solar of any state in 2020, and the ninth-most during the first quarter of 2021. But what are the top cities for solar in Utah? Let's investigate.

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