solar pv roof tiles

Solar Roof Shingles vs. Solar Roof Panels

size   material   output   appearance   service life   efficiency

Solar shingles work in a similar way to solar panels—they both absorb the sun’s rays, converting the light to thermal or electrical energy. However, there are a few important differences that you should know about when determining your home’s solar energy needs:

Size

Solar shingles are about the same size as traditional roofing shingles, with the average size being about 12 inches wide by 86 inches long, and weighing about 13 pounds per square foot. The thin tiles are less than an inch in thickness. It takes about 350 tiles to complete a typical solar roof installation.

Materials

Solar shingles are typically made from copper indium gallium selenide, which is what allows them to be so flexible and thin. This semiconductor is an ideal material as it results in a high conversion efficiency rate, which is about 10% to 12% on average. Some shingles, instead, use monocrystalline silicon, which is also used to fabricate computer chips. While these are more expensive, they are worth the extra price as they have a higher efficiency rate of around 15% to 20%.

Output

As the primary goal is to lower energy costs, this is a major consideration with solar installation. The majority of shingles will produce anywhere between 13 and 63 watts of power. The number of tiles in a typical home roof installation can lower the utility bill by 40% to 70%; by adding more tiles, you can increase the energy output.

While both solar shingles and solar panels convert the sun’s rays into energy, there are a number of differences that will help you decide between the two options:

Appearance

Since solar shingles blend right into the roofing materials, such as concrete or asphalt, many prefer this aesthetic rather than large black panels attached to the roof. In general, solar shingles create a sleeker aesthetic than do bulky solar panels, particularly since only parts of the roof, like the edging, might be covered in shingles to be efficient.

Service Life

Both solar panels and shingles have long life spans, typically upwards of 20 years. However, the longevity of solar shingles varies by the manufacturer and the installation. Warranties also vary; when you purchase solar shingles, be sure that you note the difference between power warranties. Solar shingle warranties can last for a couple of decades based on their production, while durability warranties that cover the shingles themselves can span the lifetime of the home.

Efficiency

Solar shingles are outshined by panels in terms of efficiency for a number of reasons. While solar panels can be adjusted as needed to achieve the best angle to capture the sun’s rays, shingles stay in the same place as they were first installed. You can always add more shingles to the roof to harness more energy, but as with all home improvement projects, more materials mean more money.