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How Do Solar Panels Help Save Energy – Learn the basics of solar power and get tips for incorporating this clean energy source into your home.
With a historically low price tag and juicy incentives as added incentive, more and more of us are going solar. According to the Solar Energy Industries Association, in the first quarter of 2022, solar accounted for half of new electricity generation in the US, and 13% of US homes are expected to have solar installed by 2030. Thanks to your choices off-site, solar power generation is now available to more American homes than ever before. Read on to learn more about the transformative power of the sun and find out…
How Do Solar Panels Help Save Energy
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Solar panels and roofing products are made up of photovoltaic (PV) cells that create electricity in response to light. The DC current produced in the cell then goes through an inverter to produce AC current that we can use to power the devices in our homes.
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The photovoltaic (PV) cell is the building block of solar energy. Photovoltaic describes a material that reacts to light energy (called photons) by producing electricity (volts). Inside the solar cell, silicon or other semiconductor material gets super excited in the presence of light and throws off electrons in response. Metal plates at the edge of that solar cell capture those electrons, which then flow down connected wires, creating an electric current.
At this point, what the solar cell produces is direct current (DC) electricity, where the energy flows only one way. In order for our computers and coffee makers to be able to use the current, the power must go through a device called an inverter. The converter takes the DC produced at the cell and converts it into alternating current (AC) electricity that flows from our plants.
Most of the homes in this community near Golden, CO have rooftop solar installations. At the end of 2020, there were approximately 2.7 million residential PV systems in the United States. Since 2005, the number of photovoltaic systems has increased by about 32% per year (NREL).
The solar products we buy in the solar market are generally called modules. Modules are just a bunch of cells—sometimes a dozen, sometimes closer to 100—grouped together. The solar module we’ve been used to for decades is the solar panel and this is what many of us still think of when we hear solar power discussed – rows of shiny panels mounted on roof racks. Residential panel systems are installed mainly on house roofs, but also on carports, other independent structures and (more) on the ground. Currently, there are three main types of solar panels on the market: monocrystalline, polycrystalline, and thin film. They differ in production, efficiency and durability. You may choose another one because of price, beauty or environmental features of the home, such as climate or the amount of space available for installation.
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Solar panels make up the majority of the market but, in recent years, another solar model made of the same materials is becoming more popular: the integrated solar shingle. Solar shingles are less bulky and less visible than panels and mount on your roof deck, not on a roof rack. There are a few sub-categories that share shelf space at the moment, and even though they are very different products, they are usually referred to as solar shingles to make it fun.
The Apollo® Tile II solar roofing system from CertainTeed is designed to match the profile of flat concrete tiles, blending seamlessly into the plane of the roof for a clean look and protection from water intrusion.
Solar energy systems fall into one of three categories that relate to the system’s relationship to the local power grid. The grid is our electricity delivery system in this country, connecting homes and other consumers with power suppliers and distributors.
According to EnergySage, a solar comparison marketplace supported by the US Department of Energy, most residential solar installations in this country are connected to the grid, but consumers are increasingly interested in energy storage systems. Independent supply will still be the best option for some homes: for example, remote residences with plenty of sunlight and no power lines in sight.
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You cannot power your home on one solar module. Modules (panels or shingles) are assembled in series to meet your energy needs. A typical solar installation is made up of modules and what those in the industry call a balance of system (BOS) system. This support team includes the converter(s), hardware and wiring, safety equipment, meters and monitoring devices. Packing lists will include an independent system and a battery hybrid system (or several) and a device called a charge controller that manages the electricity from the solar panel, directing it to be used immediately in the home or sent to storage. A location on the ground may have a tracking system that moves the panels during the day to maximize sunlight. Roof systems sometimes have this as well.
Timberline Solar™ from GAF Energy boasts the world’s first deployable solar shingles. This system is installed with a standard roof on the rest of the roof by one roofing contractor under one warranty.
There is no standard package in solar, and contractors design each system individually by considering three main factors:
The initial cost of a PV system depends on several factors. One column contains the equipment itself – including the model type, brand and efficiency – as well as the system size and connection to the grid. But that’s less than half of the final bill, with design, installation, permitting, interconnection all weighing heavily. Therefore, your area and home specifics can greatly affect the price you pay. Before promotion, EnergySage estimates that a 10kW solar panel installation in the US costs about $27,700 and that a full Tesla rooftop system could run between $60,000 and $75,000. The solar shingle products will united reaching somewhere in the middle.
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Incentives to reduce the price include grants, rebates and tax credits available to customers of PV systems. Some of these benefits can be overwhelming. For example, from now until the end of 2032, you can deduct 30 percent of the installed price of a system from your federal income taxes, if you pay enough in taxes to reduce your burden to this point.
How you pay is also important. A lot. Today, you can buy a system outright, or you can lease or finance the purchase, converting the upfront investment into monthly payments over several years. With traditional financing or solar loans (low interest rate loans), you own the system when you pay it off but not with rent. With a lease, you’re paying monthly on a long-term contract for a product you never own, which also eliminates your chance for incentives.
For those who buy the system outright, the initial cost is only half the story: A well-planned PV system should pay for itself in energy savings within the first several years of ownership. We will discuss the financial side of solar in our article on solar pricing.
Solar Roof by Tesla is a combination of glass solar tiles and architectural grade steel tiles that are seamless for a seamless look.
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In a 2019 Pew Research Center survey, nearly half of respondents said they had given a positive opinion in the past year about adding solar panels to their home. There are excellent reasons to consider solar power besides saving money: energy independence, grid frustration, the planet and household environmental concerns, to name a few. That said, for most solar seekers—especially those who plan to buy a system outright—the financial side of the decision is paramount.
The first question you should ask is whether your home is solar powered and to what extent. Roof mounted solar panels must be installed on a roof in good condition. Solar shingles – full roof or partial – make the most sense when your roof is ready to be replaced. Oh, and about that top? If moss is growing on it, you may not be the best candidate for rooftop solar, but your sunny backyard could be perfect for a ground-mounted solar panel system. The goal of many solar adopters is to generate enough electricity to fully meet the needs of the household, but these desires may be hindered by limited sun exposure or other factors. .
Then, with the wide range of products on the market and different recommendations between contractors, it can be a challenge to compare one offer with another. Shingles are more aesthetically pleasing than panels, but they usually come with a higher cost than panel systems that produce the same amount of power.
For insight into some of the complexities of buying solar, we contacted Dr. Becca Jones-Albertus, Director of the Office of Solar Energy Technologies at the US Department of Energy. To begin with, the large price tag on solar shingles should not surprise us, apparently. Dr. Jones-Albertus explains that the technology is relatively new, adding that the price may come down as it becomes more common. Additionally, she says, “Solar shingles combine two functions in one—roof
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