Solar panels are an easy target for misconceptions; many people think they work only when placed in sunny and clear conditions. Nonetheless, developments in solar technology now enable large scale high efficiency generation of electricity under cloudy conditions. Choosing the Right Solar Panel: If the area where you live deals with overcast skies much of the time, picking the right solar panel can go a long way in performance. In this article, we will take you through the best solar panels for low sunlight, their efficiency, costs, and their best applications, ranging from solar panels for RVs and home use.
Silicon-based solar panels — the most common type of solar panel in use today — convert about 20 percent of incoming light into energy, so on cloudy days they still work.
Yes, even cloudy days produce electricity with solar panels. Their efficiency can drop in overcast or cloudy days; however, new technology now exists for high-efficiency cloudy day solar panels that is capable of capturing diffused light. Even under very heavy cloud cover, some of the best solar panels will still generate energy at 10-25% of full capacity.
Do Solar Panels Work on Cloudy Days?
Yes, solar panels can still produce electricity on cloudy days. While their efficiency is reduced compared to direct sunlight, modern high-efficiency solar panels for cloudy days are designed to capture diffused light. Some of the best solar panels can still operate at 10-25% of their full capacity under heavy cloud cover.
Key Factors Affecting Solar Panel Performance in Cloudy Weather
Panel Type: Monocrystalline panels perform better in low-light conditions than polycrystalline or thin-film panels.
Panel Efficiency: The higher the efficiency rating, the better a panel performs in overcast conditions.
Cloud Density: Light clouds allow more sunlight through, while thick clouds reduce power output significantly.
Angle & Positioning: Optimal placement ensures maximum light absorption
Cloud Cover’s Effect on Solar Panel Efficiency
One well-liked and eco-friendly method of using renewable energy is through solar panels. Nonetheless, the effect of cloud cover on solar panel efficiency is a frequent worry. Clouds have a big impact on how much sunlight reaches solar panels, which affects how well those panels work.
Knowing How Effective Solar Panels Are in Various Weather Situations
The ability of solar panels to transform sunshine into useful electricity is referred to as efficiency. The quantity of sunshine that the panels get has a direct effect on their efficiency. Solar panels function most efficiently on bright days with lots of sunlight. Cloud cover, however, can drastically lower the amount of sunlight reaching the panels, thus affecting their efficiency.
How Cloud Cover Helps Lower Sunlight Exposure
The sun and the solar panels are shielded from one another by clouds. The panels receive less light when the sky is cloudy because clouds dilute sunlight. The electricity produced by solar panels decreases as a result of this decreased exposure to sunlight. The effectiveness of solar panels decreases with increasing cloud thickness and density because less sunlight is exposed.
Impact of Various Cloud Types on the Performance of Solar Panels
The performance of solar panels is affected differently by different kinds of clouds. Cumulonimbus clouds and other thick, black clouds can block a lot of sunlight, which significantly lowers the efficiency of solar panels. On the other hand, thin, light clouds might only slightly reduce the amount of sunlight that reaches the panel, which would have a less significant effect on solar panel performance. Predicting how much sunlight will reach the solar panels can be made easier by knowing the kind of clouds in the sky.
Techniques to Reduce the Effect of Cloud Cover on the Efficiency of Solar Panels
Although cloud cover can lower the efficiency of solar panels, there are ways to lessen its effects:
- Over-sizing Solar Arrays: By installing larger solar arrays, homeowners can compensate for reduced sunlight exposure on cloudy days.
- Battery Storage Systems: Storing excess energy in batteries during sunny days can ensure a reliable power supply when solar panel efficiency is compromised due to cloud cover.
- Tilting Solar Panels: Adjusting the tilt angle of solar panels can optimize sunlight absorption, even in cloudy conditions, improving overall efficiency.
- Hybrid Systems: Combining solar panels with other renewable energy sources, such as wind or hydroelectric power, can provide a more consistent energy supply, reducing reliance on solar panels during cloudy periods.
The efficiency of solar panels is impacted by cloud cover because it limits the amount of sunlight that reaches the panels. By comprehending the effects of various cloud types and putting mitigation measures in place, solar panels may operate more effectively and efficiently, proving to be a dependable source of clean energy even during less-than-ideal weather.
Why Some Solar Panels Struggle in Cloudy Weather
Not all solar panels perform well under low-light conditions. Some struggle due to the following reasons:
Lower Efficiency Ratings: Polycrystalline panels typically have lower efficiency rates (15-17%) compared to monocrystalline panels (20%+), making them less effective in cloudy conditions.
Thin-Film Technology: While lightweight and flexible, thin-film panels often have lower efficiency and require more space to produce the same amount of power as traditional panels.
Lack of Advanced Coatings: Some lower-end solar panels lack anti-reflective and light-trapping coatings that help enhance performance in diffused light.
Best Solar Panels for Cloudy Weather
Here are the top-performing solar panels for cloudy weather based on efficiency, cost, and durability:
| Solar Panel | Efficiency (%) | Performance in Low Sunlight (%) | Best For |
|---|---|---|---|
| SunPower Maxeon 6 | 22.8% | 25% | Home & RV |
| LG NeON R | 22.3% | 23% | Home & Cloudy Regions |
| Panasonic EverVolt | 21.7% | 22% | Cloudy & Rainy Areas |
| REC Alpha Pure | 21.9% | 21% | Residential Use |
| Canadian Solar HiKu | 20.6% | 19% | Budget Option |
1. SunPower Maxeon 6
One of the most efficient solar panels available.
Ideal for areas with frequent cloud cover.
Higher upfront cost but long lifespan.
2. LG NeON R
Great durability and high efficiency.
Performs well in low sunlight conditions.
Offers excellent warranty and degradation rate.
3. Panasonic EverVolt
Designed for high efficiency in cloudy and rainy weather.
Uses advanced heterojunction technology to enhance performance.
Solar Panels for Different Applications
Best Solar Panels for Home Use: Efficiency, Cost & Lifespan Compared
When installing solar panels for home use, efficiency and cost are the two most important factors. Here’s what to consider:
Monocrystalline panels are the best for home use due to high efficiency.
Average cost: $2.50 – $3.50 per watt.
Lifespan: 25-30 years.
Solar Panels for RVs: Top Efficient & Durable Choices in 2025
For RV owners, portability and durability matter. The best RV solar panels include:
Renogy 200W Monocrystalline Panel – High efficiency, great for cloudy conditions.
Jackery SolarSaga 100W – Lightweight and portable.
Zamp Solar Legacy Series – Built for durability on the road.
How Solar Panels Work: Answers to Common Questions
Would Solar Panels Work on Snow Days?
Yes, just less efficiently. Snow can accumulate on the panels and block sunlight, but if the panels are tilted, the snow slides off. Bifacial solar panels can also capture some light that reflects off the snow.
Can Solar Panels Function in Moonlight?
In theory, yes, but the power output is very low. Moonlight is sunlight that’s been reflected off the surface of the moon, but it’s considerably weaker than direct sunlight, making power generation virtually meaningless.
But what if the sun is hidden behind some clouds?
Here’s how to get the most out of your solar energy production if you live in a cloudy region:
- Select High-Efficiency Panels – Find those models above 20% efficiency rating.
- Set up a solar battery — Retains unused power for utilization when sunlight is low.
- Optimize Panel Placement – Install at the optimal angle for maximum exposure.
- Regular Maintenance – Ensure panels are clear to optimize light absorption.
- Opt for Bifacial Panels – They will capture sunlight on both sides, leading to more energy production.
What It All Means
But you can go for solar even if your area gets cloud-covered a lot, as long as you pick the right panels. When it comes to low sunlight conditions, some of the best options are the SunPower Maxeon 6, LG NeON R, and Panasonic EverVolt solar panels. Homeowners will want the most efficient type of panel available —high-efficiency monocrystalline panels are the best option. At the same time, the right panel selection, along with proper placement, can yield significant energy build-up even in overcast weather.
What is the best solar panel for your needs? See our solar panel comparison guide for the right system in your area alongside your budget.
