Do solar panels work on cloudy days or at night?
Solar panels don’t produce power at night, but that doesn’t mean your home goes dark after sunset. The right solar setup keeps your lights on in two ways: by storing the energy your panels generated during the day in a home battery, or by drawing grid power (and partially paying for it by using credits your system earned while the sun was up). And on cloudy days, your panels still work, just at reduced output, typically 10%–25% lower than a clear day.
In this article, we’ll explain why panels go quiet at night, what “solar energy at night” actually means in practice, and how to decide whether battery storage is a good fit for your home and your net metering plan.
In this article:
- How solar panels generate electricity
- Solar panel performance at night
- Solar panel performance on cloudy days
- How your home stays powered at night with solar
- Conclusion
- Frequently asked questions
How solar panels generate electricity
To fully understand when solar panels can produce electricity and how much they can generate, it helps to know exactly how they work. Basically, solar panels convert light into electricity: Photons, or light particles, dislodge electrons from the silicon in the panels to start the energy production process. So, while a direct beam of sunlight maximizes the amount of energy your home solar system can produce, the diffuse light of a cloudy day will produce electricity, too.
Here’s what you need to know about how solar panels work, and why it’s important to know the difference between direct and diffuse irradiation.
Photovoltaic effect: the science behind solar panels
Solar panels are made up of a number of solar photovoltaic, or PV, cells that convert sunlight into energy. When photons (aka sunlight) hit the charged semiconductor materials layered into PV cells, the cell’s electrons move, and electrical conductors absorb them, creating a direct current, or DC electricity. This current runs from the cells into the solar panel’s inverter, which turns the DC into the alternating current (AC) electricity that powers your home.
Solar panels need photons to work, and in general, the more photons directly hitting the solar cells, the more electricity they produce. And the more solar panels you have collecting those photons, the more energy you can generate. Calculating the solar irradiance, or available solar energy, for your location is one of the first things an installer will do to see if your home is a good fit for solar. Solar irradiance is key to understanding how many solar panels you need to generate enough electricity to power your home.
On bright, sunny days in the summer, when the sun is high in the sky and days are longer, your solar panels will generate the most electricity — often even more electricity than your home needs. But your solar panels will work in all kinds of weather conditions.
The tilt angle and spectral response of your solar panels are also factors in solar panel efficiency. Sunlight has a variety of wavelengths, and how PV cells respond to these different wavelengths is called their spectral response. Solar panels are now being designed with layers of cells with different spectral responses to harvest more wavelengths into energy, and optimize their performance. Low-sun angles can also reduce efficiency as the photons travel through more of the the earth’s atmosphere, and a panel’s glass. But solar panels can still generate energy when the sun is low on the horizon, just not as much.
Direct vs. diffuse light
Total solar irradiance is made up of both direct and diffuse light. Direct irradiance comes from the sunlight shining directly on your solar panels. Diffuse irradiance comes from light that has been scattered by clouds or other particles in the atmosphere.
A mix of clouds and sun can actually improve total solar irradiance, because the clouds can create diffuse irradiance alongside the sun’s direct irradiance. When there’s full cloud cover, solar panels can still generate some energy from diffuse irradiance, but at a reduced rate.
How much is a solar panel’s efficiency reduced under heavy clouds? Here’s an extreme example: Researchers tracking PV efficiency during a hurricane noted that the hurricane’s heavy cloud cover reduced the energy output to 18%–60% of their clear-sky output. (It’s worth noting that rain can be helpful for improving your solar system’s efficiency after the storm, as it will help clean off any dust and debris that might have accumulated on the panels.)
If you’re looking at your panels’ nameplate power rating, you might be wondering how that compares to these real-world conditions. It’s worth noting that even your summertime clear-sky output is likely to be lower than the nameplate power rating, which represents their maximum generating power under ideal conditions. Several factors contribute to this nameplate “power loss,” including temperature, other weather conditions, and more.
Solar panel performance at night
Solar panels need light to operate, but you might still see your system pop on at night. Here’s what you need to know about why your panels won’t produce power you can use at night, and how moonlight can affect your solar system.
Why solar panels don’t produce power at night
Solar cells need sunlight, or photons, to start the process of moving electrons to create a direct current to generate electricity for your home. Without photons, the process can’t start. So at night, your solar panels won’t produce energy.
But a solar system can still power your home after dark (hint, it involves storing solar energy from the daytime…). See the section below on how battery storage and net metering keep your home running after sunset.
Moonlight and artificial light: negligible output
Technically speaking, moonlight is a form of sunlight — it’s reflected from the sun. And an artificial light within the solar panel’s spectral response range could provide enough photons to start the process of creating electricity. But it wouldn’t be much, and it would be an inefficient way to power your system. These light sources are rarely worth harvesting.
Solar panel performance on cloudy days
Yes, solar panels work on cloudy days. They just produce less electricity than they do under direct sun. Solar panels will still generate electricity when it’s cloudy, but they’ll produce less than they do on a sunny day under direct sunlight. Output is generally reduced by 10%–25% on cloudy days, but under heavy overcast skies with no direct irradiance, output could reduce by more than 60%.
The type of solar panels you have can affect your output on cloudy days, as some perform better in low-light conditions. Monocrystalline silicon is more efficient than polycrystalline, but passivated emitter and rear contact, or PERC solar cells, also perform well in low-light conditions. PERC cells have an added layer that reflects unused light back through the cell.
Geographic and seasonal variations
Because regional and seasonal weather changes can have an effect on irradiance, any good solar installer will use tools that help them see how changes to the sun angle in winter, changes to daylight hours, and sunny versus cloudy days in your region will affect your solar production.
The National Solar Radiation Database also helps designers of solar systems understand how regional cloud cover averages will affect the expected output from your solar panels and make adjustments accordingly.
How your home stays powered at night with solar
Your solar system can keep your home running at night even though the panels themselves have gone quiet. There are two main ways this works, and understanding the difference between them changes how you evaluate a solar quote.
Battery storage systems
During the day, your solar panels often produce more electricity than your home is using, especially around midday when the sun is high. A home battery stores that surplus. When the sun sets and your panels stop producing, you draw from the battery instead of the grid.
Here’s what that looks like in practice. The average U.S. home uses about 30 kWh of electricity per day, with roughly 40% of that consumed after sunset — around 12 kWh of nighttime energy use. A 10 kWh battery (like the Tesla Powerwall 3) typically delivers about 9 usable kWh after accounting for the battery’s depth of discharge. That covers roughly 75% of a typical home’s evening energy needs. That’s enough to run your lights, refrigerator, TV, and other everyday appliances through the evening hours.
If your goal is to cover your full overnight period, most installers size solar-plus-storage systems with one or two batteries depending on your actual evening consumption. Your installer will pull your utility bill data to right-size the system for your home specifically.
Lithium-ion batteries have become more affordable and are a popular choice for homeowners considering battery storage. Other home battery options are available, though, including lead-acid batteries, which are lower cost but have a shorter lifespan, and flow batteries, like zinc-bromide batteries. Read our full breakdown of whether a solar battery is worth it →
Battery prices vary by installer and system size.
Get a quote that includes battery pricing → Aurora compares multiple vetted installers in one place, so you can see side-by-side what solar-plus-storage would cost for your home.
Net metering
With net metering, you export the excess electricity your system generates to the grid during the day to help offset the cost of the electricity you’ll import from the grid at other times. Your utility credits you for what you send and charges you for what you use.
However, if your utility uses time-of-use (TOU) rates and/or variable export rates, the math isn’t always equal. Your panels typically export power at midday when grid electricity is cheap but you import it during expensive evening peak hours, which can run $0.75 per kWh or more in high-cost markets. That means the credits you earn cover less of your evening bill than you might expect: You typically get less for the electricity you export during daytime hours than you pay for the electricity you import during expensive evening peaks. That’s why net metering alone may not cover all of your nighttime energy costs, or offer as much savings as a battery can.
See how net metering works in your state →
Comparing your nighttime power options
| Option | How it works | Best for | Upfront cost |
|---|---|---|---|
| Battery storage | Stores daytime solar production for use after dark | Homeowners who want grid independence, backup during outages, or live in a high-TOU-rate area | Higher (typically $10,000–$15,000 installed for a single battery) |
| Net metering | Exports surplus daytime power for credits used to pay for times when solar isn’t covering usage | Homeowners whose utility offers a strong net metering rate and who don’t need outage backup | None — included with your solar system |
Hybrid systems and solar generators
If your utility’s net metering program is limited, or you want more control over how and when you use your energy, hybrid systems and solar generators are worth considering.
Hybrid systems let you switch between grid-tied and off-grid use of your storage system. This lets you minimize the amount of grid power you use during peak times, and maximize the amount of money you get for exporting power to the grid. Solar generators, on the other hand, can be helpful if your area experiences frequent power outages. Compared to battery systems, solar generators are smaller and much more portable.
Conclusion
Solar panels still work in cloudy conditions, but a smart solar system design will help you optimize your output in a range of conditions. And using battery storage can help you take advantage of your system’s peak production at midday to power your home in the evening, and keep the lights on when the power goes out.
But even without a solar battery, your utility company’s net metering policies can help you offset your electricity costs when your panels aren’t producing electricity by contributing to the grid during the day. Either way, a well-designed solar system ensures you get reliable, cost-effective solar power, rain, shine, or even after sunset.
The best way to know what makes sense for your home is to see actual quotes. Aurora Solar makes it easy to connect with multiple vetted local installers and compare solar-plus-storage pricing all in one place.
Compare solar quotes for free →
Frequently asked questions
How do solar panels provide power at night?
During daylight hours, the excess energy from your solar panels can be used to charge a home battery storage system that you use in the evening. A solar-plus-storage system with a 10 kWh battery can power a house that uses 5 kW for about 2 hours. If you don’t have battery storage, net metering lets you send extra solar power to the grid during the day in exchange for energy credits, which you can use to help cover your electricity needs at night.
Is it better to charge my EV at night or during the day?
If you have solar, it all depends on your net metering plan. Charging your EV during peak daylight hours can be the cheapest way to power up your car. Plugging in your EV at this time lets you take advantage of the highest power output from your solar panels, especially if you’re not getting much money by exporting that power to the grid.
Time-of-use billing generally makes EV charging more expensive in the evening. But in the overnight hours, electricity from the grid is typically at its cheapest, making this the next best time to plug in your electric vehicle.
Can moonlight charge solar panels?
Moonlight only has a fraction of the power of the sun, and it’s usually not enough to start the process of converting photons to electricity in your solar panels.
How does solar power work at night?
Solar panels don’t produce power at night — they need photons to generate electricity, and those go away when the sun sets. But your home can still run on solar energy after dark. If you have a home battery, it can store the surplus electricity your panels generated during the day and release it after sunset. Net metering lets you send your extra daytime production to the grid in exchange for credits, which you use to offset the cost of the grid electricity you import at night.
Can you use solar energy at night?
Yes — just not directly from your panels. The solar energy your panels generate during peak daytime hours can be stored in a home battery for use after dark, or converted into net metering credits that offset your nighttime grid electricity costs. Either way, a well-designed solar system reduces what you pay for the electricity you use at night, even though the panels themselves have stopped producing.
Does solar work at night?
Solar panels don’t generate electricity at night. But a solar system (panels plus battery storage or net metering) can absolutely power your home after dark. It’s worth keeping that distinction in mind when you’re evaluating quotes: The question isn’t whether your panels will produce at night (they won’t), but whether your system is designed to cover your nighttime energy needs, and how.
Is solar worth it if I use most of my electricity at night?
It can be — but the answer depends on your utility’s net metering rate and your appetite for battery storage. If your utility offers a strong net metering program, your daytime solar production effectively banks credits that offset your evening draw. If your utility uses time-of-use pricing (most do now), those evening hours are when grid electricity is most expensive, which makes battery storage more compelling: you can charge the battery from your panels at midday when rates are low and discharge it at night when rates spike. The only way to know how the math works for your specific utility and usage pattern is to get a quote that runs those numbers. Aurora does that for you without any personal contact info →
