We earn commissions from purchases

Do Solar Generators Work on Cloudy Days?

When it comes to solar generators, one of the common questions people have is whether or not they work on cloudy days. After all, if the sun isn’t out, how can the generator produce power? 

Interestingly, solar generators actually do work on cloudy days, though not as efficiently as on sunny days. The photons in sunlight can penetrate through clouds, so the generator can still produce some power.

However, because there is less sunlight, the generator will not produce as much power as it would on a sunny day. Before we answer more of your questions related to solar generators on cloudy days, at night, and in some other situations when the sun is not smiling, let us understand first what are the components that make up a solar generator.

What Components Make Up a Solar Generator?

A solar generator is a compact device that contains the four main components of solar power systems: a solar panel system(usually sold separately), batteries, a charge controller, and an inverter.

A solar panel system is a set of solar panels that are used to capture solar energy and convert it into electricity. Solar panels are made up of a number of smaller units called solar cells, which are connected together. 

When sunlight hits a solar cell, it causes an electrical reaction that generates a flow of electrons. This flow of electrons is then harnessed to create an electrical current, which can be used to power electrical devices. 

The battery or batteries are used to store electricity so that they can be used when the sun is not shining. While a charge controller is used to regulate the flow of electricity in the solar system from the solar panels to the batteries. 

Inverters are used to convert the direct current (DC) power produced by the solar panels into alternating current (AC )power that can be used to run appliances and electrical devices. Without an inverter, solar generators would be limited to powering DC devices only. 

How Do Solar Panels Work in Cloudy or Rainy Weather?

On cloudy and rainy days, it’s actually not the generator that’s directly affected when the cloud cover appears, but the solar panel. Solar panels need light from the sun to generate power.

When heavy clouds appear, heat or the photons in sunlight can penetrate through the clouds, so the solar panel can still collect some range of power. However, because there is less sunlight, the solar panel output will not be as much as it would on a sunny day so when it’s cloudy or raining, they are less effective. 

The most important factor for the popularity of solar panels is not the amount of sunlight a city sees, but rather the cost of electricity. Many of the top cities for solar in the U.S. are not particularly sunny, but have high electricity rates, resulting in homeowners seeing major benefits in terms of bill savings and a quick break-even point. 

Take San Francisco, for example. Although the city is famous for the fog that hovers over it for most of the year, it is a top-five city for solar. The high cost of energy and the city’s generally warm climate, which yields soft but consistent sunlight all year long, is the reason why solar is so effective at generating energy savings.

In some cases, clouds can actually help solar panels perform better than if it was sunny. This is because clouds can reflect or magnify sunlight, which gives the solar panels more power. Water from the rain can also help to keep the operational solar panel efficiency by washing away any dust or dirt. 

If you live in an area with a strong net metering policy, the excess energy generated by your panels during sunny hours will offset the energy that you use at night and other times when your system isn’t operating at full capacity.

Do Solar Panels Work in Cold, Cloudy Climates?

The cities that are the cloudiest in the US are New York, San Francisco, Milwaukee, Boston and Seattle. These areas are where unsparing weather conditions like rain, fog, and blizzards are experienced.

They are also the ones that see the highest level of savings from solar installations. The cost of electricity can change the name of the game. It is one of the biggest factors in determining whether solar saves people money on their electricity bill.

In New York and San Francisco, the high cost of electricity makes solar installation worth the investment from a simple homeowner to big company owners.

Does Temperature Affect Solar Panels?

It is a misconception that solar panels only work well in hot weather. In fact, they work best in sunny and cold weather. When panels get too hot or above 77 degrees Fahrenheit, they become less efficient. 

However, these factors do not mean that they will not work in traditionally hot places. Solar systems save homeowners money primarily due to electricity costs, not the weather. 

Do Solar Panels Work if They Are in the Shade?

If your solar panel is partially shaded, it will produce less energy. But because solar panels are designed so that shading will not completely stop energy production.

The amount of energy production that is lost to shading depends on the type of solar panel technology, like the types of inverters used, for example. If one panel on the roof of your house is shaded for a couple of hours, the whole string of panels will be affected and won’t produce as much power.

The good news is, that having microinverters under each panel will prevent this problem from happening because each panel is independent. If things like trees shade 20% of the PV panels, only 20% of the system’s energy output is diminished.

To get rid of that shady situation, qualified and local solar installers will know the best way to install solar panels on your home, taking into consideration the climate and geographic location. Get a certified installer that has good reviews and is experienced enough to do the job.

Among countries, Germany is an icon and a world leader in renewable energy, specifically solar power. According to a recent Greentech Media article, Germany achieved its strongest growth in solar power in half a decade last year.

This just goes to show that solar power is about saving money and helping the environment, not just about the weather conditions. 

Do Solar Panels Work at Night?

No, they don’t. Solar panels rely on sunlight to generate electricity, so they won’t work in the dark. The confusion about solar panels working at night is often due to the concept of solar power storage, which allows homes to still have energy supply at night.

Solar panels need direct sunlight in order to generate electricity, but that’s not the only way they can be used to reduce energy consumption. Solar panel systems also come with two other options, such as backup battery storage and net metering capabilities. 

Net metering policies differ from state to state, but they typically allow you to get credit or incentives for the extra power your solar panels generate and send back to the grid to be used by the utility. This credit can be used during periods when your system produces less power, like at night or when it’s cloudy outside.

To know more about net metering networking, read this related article or watch this YouTube video:

How Net Metering Works

What is net metering and how does it work

Final Thoughts

Yes, solar generators work fine on cloudy, cold and rainy days alongside a great solar panel system but with efficiency generally lower.

Moreover, the average prices of electricity in your locations, among others, will determine the results or the answer to the question of if and when you can save money with your solar generators.

The bottom line is, that you should not let a cloudy day sway anyone away from considering clean and green energy from solar power.

Leave a Comment