A solar power system offers a guaranteed return on investment, but only if you use high-quality products installed by professionals. Remember that solar panels are electrical devices, and they need adequate wiring and protections like any other system with voltage and current.
Also, consider that solar panels are intended to operate for decades, and they need a reliable racking system that resists high winds and other harsh weather conditions.
Before installing solar panels for a home or business, a very important step is choosing your product brands and installation company. Keep in mind that solar panels are only one part of a functional photovoltaic system, and you need to ensure that all components are safe and durable.
For example, you need a high-quality inverter to convert the output of solar panels into a stable AC voltage supply, and you need a tough racking system to hold the modules in place.
In this guide, we will provide some recommendations when choosing solar panels, inverters, and other system components. We will also discuss what to look for when comparing solar installers, to ensure that all elements of your PV system are properly installed.
The last thing you would want is purchasing a top solar panel brand, only to have your warranty voided by a poor installation procedure.
Solar panels with identical specifications can have a different electricity output, depending on how much sunlight reaches their photovoltaic cells. Before installing solar panels on any home or business, finding the ideal placement is a very important design decision. There are two important requirements:
Ideally, solar panels should be installed in areas that never get shading. When this is not possible, they should be located on the rooftop or ground areas that will get the least possible shading throughout the year.
Solar panels should also be positioned for maximum productivity. Their tilt angle and east-west orientation (azimuth angle) should allow the highest possible solar radiation on their surface, which translates into maximum savings.
Ground-mounted solar systems offer more flexibility during installation since their racking structure can have any tilt or orientation. Roof-mounted solar systems offer less flexibility since their possible orientations are limited by roof geometry and topology.
Solar engineers use advanced design software such as PVsyst, which can simulate the sun’s position in the sky throughout the year. This way, they can find the ideal placement for solar panels in any part of the world. When the optimal placement is not possible due to roof geometry or other site conditions, they can determine the second-best option that is feasible.
Solar design software can also simulate the shadows cast by surrounding obstacles such as trees and buildings. Based on the simulation of the sun’s movement, design software can determine how shadows will behave during the day and throughout the seasons. Using this information, the optimal areas for solar panels can be identified.
Solar Panel Positioning: The Effect of Geographic Location
The sun’s position in the sky at a given time of the year depends on your geographic location. In northern hemisphere countries like the US and Canada, most sunshine comes from the southern portion of the sky. This means that solar panels should be tilted south to maximize the amount of sunlight reaching their surface.
A north-facing solar panel will still generate electricity because it gets indirect sunlight, but it will not reach the highest possible output.
The opposite applies for southern hemisphere countries: solar panels should be tilted north, since most sunlight comes from that direction. For example, you would notice this if you visited Australia, one of the leading solar countries in the southern hemisphere.
As you move farther to the north or south, the sun’s position in the sky is lower at a given time of the year, and the optimal tilt angle for solar panels increases.
For example, California and Alaska are both located in North America, but the sun is much lower in the sky in Alaska. If you compare pictures of solar arrays in both locations, you will notice that the tilt angle is higher close to the north pole.
Finally, in countries close to the equator, the ideal placement for solar panels is facing upward. This maximizes the incident sunlight since the sun tends to be high in the sky throughout the year. This is very convenient in commercial buildings with large and flat roofs, since there is no need for a tilted mounting structure.
Finding the Optimal Solar Panel Tilt with the Global Solar Atlas
You can use the Global Solar Atlas to check the solar resources available in any part of the world, and this includes the ideal tilt angle for photovoltaic panels. The Global Solar Atlas was developed by the World Bank and the International Finance Corporation (IFC), and using it is very simple:
Find your location by dragging and zooming the map provided by the Atlas and click.
Alternatively, you can simply input your coordinates on the search bar.
Both BiPV shingles and traditional solar arrays offer a service life of 25 years or more, and they make sense from a financial standpoint. However, if you’re among the homeowners who prefer the look of a traditional roof without PV modules, you might be interested in a solar roofing system.
GAF is an established provider of high-quality roofing materials, and they recently developed the Timberline Solar Energy Shingles. This product is characterized by being the first nailable solar shingle in the market, which makes the installation process much simpler.
GAF has designed a solar shingle that can be easily installed by roofing contractors, making the overall process easier for homeowners.
Normally, homeowners need to contact two separate companies to install their roofs and solar panels.
GAF offers complete roof replacements that include solar shingles, similar to how Tesla Solar Roof works. In other words, you cannot use their solar shingles for a partial roof upgrade. This is not a problem for new construction projects and homes that require a complete roof replacement.
However, if your roof is relatively new and in good condition, traditional solar panels have a lower cost and a quicker payback period. There are also solar shingle providers who offer partial upgrades, where only the roof areas that will be used to generate electricity are upgraded.
GAF: Innovation is a part of their DNA
GAF stands for General Aniline & Film, and they are currently the largest provider of roofing and waterproofing solutions in North America.
GAF introduced the Timberline roof shingle in 1967, and it became one of the most popular roofing products in the US. One of the companies that merged to create GAF was RUBEROID which launched the first individually cut asphalt shingle in 1912, and the first interlocking shingle in 1933.
GAF Energy was created in 2019 as a separate business unit, with the goal of providing solar solutions for residential and commercial buildings. GAF and GAF Energy are sister companies, both owned by Standard Industries. There are two main product lines:
The DecoTech system integrates solar panels into the roof structure, allowing a flush installation without separate racking.
The Timberline Solar roof system uses solar shingles instead of traditional PV modules, and GAF has developed the first nailable solar shingle in the world.