Do Solar Panels Work When Its Raining?

There’s a lot to love about solar power. If you’re an environmentalist its a clean and safe source of energy that’s more reliable than it has ever been. If you’ve added solar panels to your house and watched the electric bills drop, solar can seem like a miracle. But how do these panels work when the weather isn’t exactly sunny and bright?

That’s a good question, and one that we get asked a lot.

Solar panels still collect power anywhere from 20-50% of their average on rainy days depending on the amount of cloud cover, age and quality of the solar panels, and the connected solar batteries.

Solar power is appearing everywhere from my brother’s portable phone charger to my cousin’s college backpack, to the top of my garage to help cut down on electric bills. While there’s no argument that the solar panels will work better on sunny days than on cloudy or rainy days, solar systems are built to be as effective as possible in any given situation.

So does solar power work when it’s raining? The answer is yes, but not as well as it does on sunny days.

Rain might temporarily lower the effectiveness of solar panels – but it also cleans off dust, dirt, and grime to make sure they remain fully effective on sunny days.

While solar panels need sunlight to produce electricity, they can still generate power when it’s cloudy or raining. The amount of energy they produce will depend on the level of sunlight that reaches them. Rain can actually help solar panels work better by washing away dust and dirt that may have accumulated on the panels.

This means that when the sun comes out again, the panels will be able to generate more power than they would have if they had not been cleaned by the rain.

It’s worth noting that while solar-powered equipment may not work as efficiently in the rain, it is still a viable source of energy. In fact, some areas that receive a lot of rainfall have found success with solar power.

For example, Germany, a country known for its cloudy and rainy weather, has become a leader in solar power production. So, while rain may not be ideal for solar power, it doesn’t mean that it’s not a viable option for those looking to reduce their carbon footprint and save money on energy costs.

How Solar Power Works

Solar power is a renewable energy source that converts sunlight into electricity. Solar panels are the primary component of solar power systems. They are made up of photovoltaic (PV) cells that convert sunlight into direct current (DC) electricity.

The DC electricity generated by solar panels is not suitable for use in homes or businesses, so it must be converted into alternating current (AC) electricity using an inverter.

Solar Panels

Solar panels are made up of PV cells that are made of silicon. When sunlight hits the PV cells, it excites the electrons in the silicon, producing an electric current. The PV cells are connected together in a series to create a solar panel. The more panels that are connected together, the more electricity is produced.

Solar panels work best when they are pointed directly at the sun. This means that they can be less effective on cloudy days or when the sun is low on the horizon. However, even on cloudy days, solar panels can still produce electricity. Rain can actually help solar panels work more effectively by washing away any dust or dirt that has accumulated on the panels.


The DC electricity generated by solar panels is not suitable for use in homes or businesses, so it must be converted into AC electricity using an inverter. The inverter is connected to the solar panels and converts the DC electricity into AC electricity that can be used to power homes and businesses.

The inverter also has the ability to monitor the performance of the solar panels and send data to the owner of the system. This data can be used to optimize the performance of the solar power system and ensure that it is working at maximum efficiency.

Effects of Rain on Solar Power

solar panels on garage

Reduction in Power Output

Solar panels generate electricity by converting sunlight into energy. As a result, when it’s raining, the amount of sunlight reaching the panels is reduced, which means that the amount of electricity produced is also reduced.

According to various studies, solar panels can still generate power. Old ones when they first came out only generated about 5% to 10% of their rated capacity during rainy days.

Since then designs have improved quite a bit, and on average it seems like the solar panels hit 40-70% of what they usually do on cloudy/rainy days versus sunny ones for the house.

What really nose dives the production of solar energy is about four inches of snow cover. That will drop the numbers down to zero.

When it comes to rain, it’s still important to understand that the reduction in power output varies depending on the severity of the rain.

Light rain will block less sunlight, while heavy rain, which tends to fall from darker rain clouds, will block more sunlight, resulting in a greater reduction in power output.

Efficiency on Cloudy and Rainy Days

On days with cloud cover or rainfall, my solar panels typically produce around 10-25% of their optimal capacity, according to experts I’ve researched (source). This does mostly match with what I’ve seen from actual readouts we get (fun fact, you have the ability to see what you are producing power-wise when you have a system put in) although admittedly the amount of electricity generated depends on the density of cloud coverage or the extent of rain.

Although the efficiency is reduced compared to sunny days, my solar panels can still function during the rainy season because sun rays can penetrate through rain and clouds (source). One less-known benefit of rain is that it helps clean away dirt or dust from the solar panels, keeping them naturally clean so that when it’s sunny they’re working at top levels again.

When it comes to managing electricity usage, I find it helpful to keep in mind that solar panels may not be fully efficient during cloudy or rainy days (source). Nonetheless, my solar-powered equipment continues to function during the rainy season, and it still helps reduce the bills even if it’s not as much as I like to see.

Solar panels and rainy seasons do coexist, though Iowa recently has had very few all rainy days or all stormy days, so it is possible the 25% we see on those days is a touch high compared to areas that have thorough rainy seasons – the real number might be more like 10% for those places.

How Badly Do Rainy Seasons Affect Power Production?

During the rainy season, the amount of sunlight reaching the solar panels is significantly reduced. As a result, the power output of the panels is also reduced.

However, it’s important to note that solar panels are still capable of generating electricity even during the rainy season.

While the rainy season may result in a reduction in power output, it’s worth noting that solar panels are still capable of generating electricity even during overcast or cloudy days. In fact, solar panels can generate up to 30% to 50% of their rated capacity during cloudy days.

Safety Concerns

One of the main concerns when it comes to solar power and rainy weather is safety. It’s important to ensure that the solar panels are installed properly and securely so that they don’t get damaged by high winds or heavy rain.

Additionally, it’s important to ensure that the wiring and electrical components are properly insulated and protected from moisture to prevent electrical shock or damage.

It’s also important to note that solar panels can still generate electricity even when it’s raining. As a result, it’s important to take appropriate safety precautions to prevent electrical shock or damage to the electrical components when working with solar panels during rainy weather.

Rain and Dust

Rain Washes Off Dust

One of the benefits of rain for solar powered equipment is that it helps to wash off dust and dirt that may have accumulated on the panels. This dust and dirt can reduce the efficiency of the panels by blocking sunlight from reaching the photovoltaic cells. When it rains, this dirt is washed away, allowing the panels to operate more efficiently once the sun comes back out.

Improved Efficiency After Rain

While solar panels do still work when it is raining, they are not as efficient as they are on sunny days. However, after a good rain, the panels can actually operate more efficiently due to the removal of dust and dirt. This is because the rainwater also helps to cool down the panels, which can improve their efficiency.

According to some studies, solar panels can generate between 5% and 25% more electricity in the days following a good rain. This can be especially beneficial for those who live in areas with dry, dusty climates, where dust and dirt can accumulate quickly on the panels.

Temperature Actually Matters

One crucial aspect that influences solar panel performance is temperature. Solar panels have a sweet spot, a particular temperature at which they work their magic most efficiently. As the mercury rises, solar panels actually become slightly less efficient, which was an unpleasant surprise during the hot summer when we needed that free energy to run the AC!

This is generally mostly an issue during the hottest days of summer but it doesn’t have even the same effect as rain, clouds, or a thin layer of dust so most people are going to find that although inconvenient, it’s still worth the trade-off.

So, to wrap things up, solar panel performance can get a little finicky when faced with dirt and dust build-up, pesky temperature changes, and rainy weather shenanigans. But by staying in the know about these factors and making the right moves, we can keep those solar panels humming along smoothly, even when the rain tries to rain on our parade.

Storing Solar Energy for Rainy Days

This is an issue that’s more for camping or off-grids as those connected to a city grid won’t have that much concern here, but there are still ways that solar systems are set up to weather the storms when it comes to giving you uninterrupted power.


For those cloudy and rainy days, I recommend looking into adding a solar battery to store the excess energy my solar panels generate. During less productive periods, like stormy and dismal days, a battery can be an excellent way to ensure that my home solar system continues to provide power even when energy generation from the panels is low. By storing the energy I generate on sunny days in a battery, I can still reap the benefits of solar power during the rainy season. Moreover, batteries are not just for homeowners in damp climates; they can enhance the effectiveness of solar systems worldwide, as noted by Sunnova.

Solar Systems

My solar panels work in indirect sunlight as well, producing power even when the light is reflected or partially blocked by clouds. They are most effective in direct sunlight, but they can still generate electricity on cloudy or rainy days, sometimes up to 25% of their normal power output, as explained by Solar Panels Network. Power production might not be as high as on a sunny day, but it remains operational during less favorable weather conditions.

Additionally, it’s important to maintain my solar panels’ cleanliness for optimal energy generation. The good news is that rainfall helps in washing away dust and debris, keeping the panels clean and operating at maximum efficiency from season to season, according to SunPower.

Final Verdict: Solar Panels Still Produce in Rainy Conditions

So, does solar powered equipment work when raining? The answer is yes, but not as effectively as it does when it is sunny. Rain clouds can reduce the amount of sunlight that reaches the panels, which in turn reduces the amount of electricity they generate.

However, rain can be beneficial for solar panels as it washes away any dust or dirt that may have accumulated on the panels. This means that when the sun comes out again, the panels will be able to work more efficiently.

It is important to note that while solar panels may not work as well in the rain, they will still generate some electricity. In fact, an average solar panel can generate 30% to 50% of its optimum capacity during cloudy days. Furthermore, they can generate 10% to 20% of their capacity during rainy days.

So, while it is true that solar panels may not work as well in the rain, they are still a reliable source of energy. They are also environmentally friendly and can help reduce our carbon footprint.

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