Quick Answer
Ground-mounted solar systems offer more flexibility and space to install larger arrays, while roof-mounted systems take up existing roof space and may have structural integrity concerns. Ground mounts are often more efficient and easier to maintain, but can be more expensive. Roof mounts are generally less expensive upfront.
Installation Flexibility
Ground-mounted solar systems have more flexibility in terms of installation orientation and angle. This allows for optimal energy production, especially in regions with changing sun angles throughout the year. A south-facing tilt of 30-40 degrees is commonly recommended for maximum energy production. Ground mounts can also be installed in a variety of configurations, including single-axis and dual-axis trackers, which can increase energy production by up to 45%.
Structural Integrity and Cost
Roof-mounted solar systems, on the other hand, require careful assessment of a building’s structural integrity to ensure the roof can support the weight of the solar panels. This can be a significant concern, especially for older or damaged roofs. However, roof mounts are generally less expensive upfront, with costs ranging from $2 to $5 per watt, compared to ground mounts at $3 to $6 per watt. The cost difference can be offset by the reduced installation costs for roof mounts, which typically range from $0.50 to $1.50 per watt.
Maintenance and Efficiency
Ground-mounted solar systems are often easier to maintain and repair, with better access to the panels and electrical connections. This can result in higher system efficiency and longer lifespan, with some ground mounts lasting up to 25 years or more. Additionally, ground mounts can be designed with easy-to-access monitoring systems, allowing homeowners to track energy production and performance in real-time.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.