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Rooftop Solar vs. Ground-Mounted Solar
At GreenSpark and throughout most of the solar industry, two types of solar arrays are most common: roof mounts and ground mounts. Your salesperson can help figure out which type of array is best for you, but this blog will provide some information on the primary differences between the two, including the advantages and disadvantages of each.
What is a rooftop solar array?
A rooftop system is the most common type of solar array that we install. With a roof-mounted array, a racking system is typically attached to the roof and the solar panels are then attached to the racking. The racking can be attached to most roof types, including asphalt shingle, tile, metal, tar, etc. It’s important to note that the solar panels are never attached directly to the roof, only the racking, so they will not damage your roof. On average, solar panels only add about 3-5 lbs per square foot to your roof, which is nominal relative to what a roof can structurally handle (which is typically about 20 lbs per square foot).
Another option is a ballasted array. These are most commonly used for flat roofs and commercial buildings. Ballasted arrays are weighted systems that eliminate the need to penetrate the roof.
In the Northern Hemisphere, solar panels will generate the most energy if they are installed on the South-facing portion of a roof. However, East-facing and West-facing arrays can provide sufficient production as well.
Top things to know about roof mounts:
Being that rooftop arrays are on the top of your home or building, they allow you to maximize available space that is not utilized for other purposes
Having solar panels on your roof actually protects your roof from the elements, so your roof will likely last longer
Rooftop arrays typically cost less to install than ground mounts
Considerations:
Homeowners may want to consider replacing an older roof prior to installing solar, especially if the roof may need to be replaced within the next few years
Your roof may not be able to fit an array that covers 100% of your electric needs, but there are still other options
We recommend homeowners add their solar array to their homeowner’s insurance
What is a ground-mounted solar array?
Ground mounts are a great option for both commercial and residential installations when a roof mount system cannot provide what is needed to cover 100% of the electric needs, typically due to space or structure restrictions. A ground-mounted solar array means the panels are secured to racking that is connected to the ground via metal posts. These can be smaller systems in a backyard or a large-scale solar farm out in a field.
Top things to know about ground-mounts:
Ground-mounted panels can face in any direction and aren’t dependent on the orientation of the roof like roof mounts, so they are best for optimal energy production
If the array needs maintenance, it’s much easier to access than a roof mount
Agrivoltaic systems, or the co-location of agriculture and photovoltaics, can help crops flourish
Ground mounts can provide multiple uses through shading and protection in parking lots in the form of carports
Considerations:
Ground-mounted arrays can take longer to install than rooftop solar
Ground mounts are typically more expensive to install than roof mounts
The area around the solar array will need to be maintained to ensure optimal production of the array and no shading occurs (i.e. no high grasses or vegetation that would exceed the panels)
Which type of solar array is right for you?
To find out which solar array is best for you, reach out to us! Sign up for a free solar consultation and our experts can help you figure out which system would best fit your needs, budget, and home or business.
