For many years, people have relied on panels when coming up with a solar power system that is capable of generating enough electricity. However, there is a new trend. Some homeowners are now opting for solar roof shingles as opposed to panels when installing a new system.
Thus, if you are planning on going solar, you have two options. You can choose a system that is built with panels or with shingles.
How do panels and shingles differ? This article provides a comparison to help you decide on the best technology for your home.
What are Solar Panels?
Solar panels are glass-like devices that convert sun rays into electricity. They are usually placed on the roof, but can also install them in any other suitable location.
Many of the panels available in the market are blue or black. They also come in different physical sizes.
What are Solar Roof Shingles?
Solar roof shingles are small solar panels designed to function and look similar to the standard roof shingles. Most of them measure 300 mm 2,180 mm. They can, therefore, be considered as photovoltaic sheets that convert the energy from the sun into usable energy.
Solar power shingles act as both the roof of the house and as a solar power system. This is the reason why they are also referred to as solar roof shingles.
Comparing Solar Panels and Solar Roof Shingles
Panels and shingles perform the same function, where they are both used to generate electricity or heat from the sun. However, in addition to that, there are other notable similarities and differences between the two technologies.
Panels and shingles have the same working principle, where they both employ the photovoltaic effect.
Panels and shingles are made of solar cells constructed using semiconductor materials. Under normal conditions, the cells are dormant. However, once exposed to the sun, they are activated and start to generate electricity instantly.
But how does this work?
The semiconductor materials used to make panels and shingles are made of electrons that are held together in their atoms. When they are exposed to sunlight, they absorb the energy particles called photons that energize the materials. This allows electrons to break free from their atoms and to start moving across the cells.
The whole process results in the generation of electricity, which is the flow of electrons. The produced power is then tapped and directed to the next component in the system. This can either be an inverter or charge controller, depending on the type of system in place.
The efficiency of solar cells used to make panels and shingles differ. Panels are the more efficient of the two, with the best in the market having an efficiency of about 22%. On the other hand, the best shingles that are currently available for purchase have a conversion rate of about 20%.
Based on the figures, it is evident that the difference in efficiency between panels and shingles is very small. Thus, either of the two technologies can generate enough electricity for your home provided that the system is designed correctly.
When it comes to costs, solar power shingles are more expensive than panels. On average, they cost about double the price of a panel for any given amount of kW. The difference in price is influenced by many factors.
The variation in cost between panels and shingles is due to the nature of the market. The solar panel sector is competitive due to the high number of manufacturers flooding the market with their products. This has resulted in the price of panels reducing considerably over the years.
In contrast, shingles are still new technology. The number of manufacturers is, therefore, few compared to those producing panels. The lack of stiff competition is the reason why the price of shingles is still high. Here is a list of the most popular manufacturer of shingles:
The cost of solar shingles for home is also dependent on the manufacturers. For example, Tesla roof cost around $45,000 for roofing measuring 2,000 square feet. This makes Tesla solar roof shingles one of the most expensive in the market.
Sometimes it might be reasonable to install shingles as opposed to panels. For instance, if you are planning on installing a new roof, it would be cheaper to install solar shingles as opposed to a traditional roof and then adding panels on top. The reason for this is that shingles will act as both a roof and generator of electricity, thereby justifying the high cost.
When it comes to installation, residential solar power shingles are easier to mount compared to panels. The process is also fast when working with shingles. Solar technicians may only require a few hours to install shingles for a system that may take several days when using panels. However, there are other areas where panels outdo shingles.
Shingles are limited by the fact the installation design is dependent on the nature of the roof that is the tilt and orientation. This has an impact on the output of the devices. They are inefficient when the roof is not facing the sun and efficient when it is facing the sun for the most part of the day.
In contrast, solar panels offer more flexibility during installation for maximum efficiency. They can be tilted or oriented, depending on the position of the sun. This allows maximum sunlight to fall on the panels during the day, leading to increased output. Furthermore, solar panels can be installed anywhere within the home, unlike shingles, that can only be placed on the roof.
Another difference occurs when you decide to change houses. Solar panels can easily be uninstalled and then installed again in the new home. However, that is not the case with shingles since they double as the roof. Therefore, removing them from one house and then installing them again in another one is a complex process.
Both solar panels and shingles are durable since they are both built to withstand harsh weather conditions. But how long can they last?
Panels can last for more than 20 years. This is a quality that has already been proven since the technology has been existence for long.
On the other hand, manufacturers of solar power shingles state that they can also last for the same number of years as panels. Tesla has even gone to the extent of claiming their products will last more than 40 years. However, the life span of shingles is yet to be proven since they are still new technology.
It is worth noting that the long lifespan of both panels and shingles is not a guarantee that they will maintain their efficiency throughout. Due to various factors, they might suffer from reduced output after many years of use.
Maintenance and Repair
Solar panels and shingles are designed to last. Therefore, the two technology requires little maintenance and repair works once they installed. However, the difference arises when the need to replace faulty panels or shingles arises.
Panels can be replaced easily compared to solar roof. The technician is only required to isolate the faulty panel, remove it, and then install the replacement. On the other hand, replacing defective shingles can be a complicated process. For instance, one might be required to remove the shingles around the faulty one to allow for replacements to be fitted.
Also, removing a shingle to allow for replacement leaves the house exposed since shingles act as both a power system and the roof of the house.
Solar power shingles are designed to look like asphalt shingles and look more like any other traditional roof once they are installed.
They can be installed on top of an existing roof or on their own, where they double up as both a roof and an energy system.
The characteristics allow them to give the roof an appealing look, and one might not even realize they are solar tiles.
In contrast, panels give a house a less attractive look compared to shingles. They come in large sizes and are usually placed a few centimeters above an existing roof. Thus, they can be noticed because they interfere with the appearance of the roof.
Benefits of Using Solar Roof Shingles or Solar Panels
Here are the benefits associated with installing a home solar power system that makes use of either panels or shingles:
Reduced Energy Costs
Both panels and shingles are responsible for converting sunlight into usable electricity. Therefore, when used alongside other solar components such as inverters, they allow you to come up with a system that generates power directly from the sun.
A well-designed solar power system that uses panels or shingles can solve all your energy needs. This, in turn, reduces energy costs since you are no longer dependent on the costly power from the grid.
Source of Income
Residential solar systems designed with either panels or shingles are capable of generating more energy than is needed within the home. As the owner, you can choose to sell the surplus to utility companies for distribution to other consumers. The power system then becomes a source of income, which allows you to recover the cost of installing the system within a short time.
If you want to sell to utilities, you will be required to connect the solar power system to the grid and install a net meter. The role of the net meter will be to compare the number of units you supply against the ones you take from the grid.
Increase in Home Value
A house with a solar system in place, regardless of whether it is using panels or shingles, is worth more than those without one. This is due to emerging trends in the real estate sector, among them the passion for sustainable homes and the need to save on energy costs.
The trends are leading buyers into picking homes with a solar system as opposed to those that are dependent on the grid. Therefore, if you are considering selling your house in the future, then you should increase its value by installing a solar system.
Solar Incentives and Tax Credits
States across the US are encouraging homeowners to install solar power systems by giving incentives and tax credits. The benefits apply to both panels or solar shingles and have played a crucial role in making the device more affordable.
Therefore, you can be sure of spending less regardless of the technology you choose to use while also been guaranteed high returns on investment.
Protection of the Environment
You have the responsibility of protecting the environment for the benefit of the current and future generations. You can realize this is by installing a solar power system.
By using solar power, you reduce the demand for fossil fuels used to generate electricity in power plants, and which is then fed to the grid. This, in turn, reduces the emission of harmful gases that are the primary cause of global warming and climate change.
Solar panels and solar roof shingles have similarities and also differences. The two technology have the same working principle and are both durable. But, panels are more efficient, cheaper, and makes maintenance and repair work easier compared to shingles. On the other hand, shingles are easier to install and gives the house an appealing look compared to panels.
Regardless of whether you choose panels or shingles, there are benefits that you will enjoy. The installed power system will reduce energy costs by minimizing dependence on the power from the grid. The system becomes a source of income when you choose to sell excess energy. Having a solar system in place increases the value of your home.
Also, utilizing solar energy allows you to play a part in protecting the environment by reducing the demand for fossil fuels.