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The better place for solar panels is the location that suits your property's sunlight, structure, available space, access and electrical design. A good roof can be an efficient use of otherwise unused space. A ground-mounted array may be worth considering when the roof is shaded, unsuitable or simply not the preferred location. Ground mounting is not automatically better, and rooftop solar is not automatically the lower-cost finished project. Compare two actual designs where both are feasible.
For Middle Tennessee homeowners with a house, barn and open land, the useful question is not “Which kind of solar is best?” It is “Which location gives this property a practical system we can maintain and live with?”
The Department of Energy's homeowner guide identifies roof age, shade, size, shape and orientation as important considerations. A roof shaded by trees or nearing replacement is not equivalent to an unobstructed roof in suitable condition. Ask for an assessment of the actual surfaces proposed for the array, rather than a panel layout based only on an aerial image. Read DOE's Homeowner's Guide to Solar.
Discuss your next roofing project at the same time. If roof work is likely soon, ask what would happen to the solar equipment, who would remove and reinstall it, and whether that work is included in the proposal. Do not let the solar estimate and roof estimate describe incompatible plans for the same surface.
It can. Purpose-designed clamps may provide an attachment approach that does not penetrate the panel, but clamp selection must match the particular seam and application. S-5! warns that seam shapes vary and an incorrect clamp can damage the roof or fail. “It is metal, so we can clamp anything to it” is not a sufficient design. Read S-5!'s compatibility guidance.
Ask the installer to identify the roof system, proposed attachment and responsibility for roof-related warranty questions. Neither a metal roof nor a clamp eliminates the need for a structural and electrical design.
A ground array needs a structure and foundation appropriate for the site. IronRidge's guidance describes foundation design based on site conditions and soil class, and notes that some locations require site-specific soil information or testing. The presence of a sunny field does not establish that any support system can simply be placed there. See the manufacturer's ground-foundation guidance.
During the site visit, ask the designer to consider the intended array area, access for installation, the route to the electrical connection and the land's other uses. Bring up septic infrastructure, utilities, drainage features, easements and future building plans so the relevant professionals can verify constraints. Do not mark an exact foundation location based solely on this checklist.
Where will people walk? How will the surrounding vegetation be managed? Is the area used for animals, parking or deliveries? Will a future shed or growing trees change the site? These are owner decisions worth settling before construction. Ground access may change how equipment is serviced, but it does not make energized equipment safe for homeowner repairs.
The IronRidge installation manual calls for checking site loading, foundation requirements, module compatibility and applicable rules, with electrical work performed by qualified professionals. Those requirements are part of the project, not optional extras added after choosing the location. Read the manufacturer's installation requirements.
Ask both options to state the equipment, proposed capacity, estimated energy production and assumptions. If one quote includes backup batteries and the other does not, they are not the same product. If one omits site work, roof work or electrical upgrades, the headline price does not represent the same scope.
Also request the shade and seasonal assumptions behind the production estimate. Do not accept a promise that a particular location will eliminate your electric bill without a separate, property-specific calculation of consumption, utility charges and the applicable export arrangement.
House with a suitable roof and a small yard: the roof option may preserve the outdoor area the family wants to use. The assessment still needs to establish the roof's condition and the attachment plan.
House with a heavily shaded roof and a potentially sunny field: a ground option deserves evaluation. The field still needs a site assessment and an electrical route; it should not be assumed suitable from one sunny afternoon.
These examples illustrate the decision process. They are not actual customer projects, production estimates or recommendations for a particular property.
Whether panels are on the house or in the yard, a grid-connected installation must follow the serving utility's process. NES publishes renewable-generation interconnection information and instructs customers to obtain approval before ordering project materials. Other Middle Tennessee utilities have their own processes, so identify the utility from your bill before requesting a final design. See NES's published guidance.
No. Compare the proposed locations using the actual equipment, orientation, shade and design assumptions. A broad claim about ground mounting does not replace a site-specific estimate.
Age alone is not the assessment. Ask for an inspection of condition, attachment suitability and likely future roof work. Address known problems before installing equipment over them.
Potentially, subject to the building's suitability and the electrical design. Ask the installer to evaluate that structure as its own option rather than assuming its roof performs like the house roof.
Mounting location does not establish backup capability. Ask separately about the inverter, storage and controls required for the outage functions you want.
This guide recommends professional design and installation. Foundations, loading, underground services and electrical hazards must be addressed together; easy access from the ground is not evidence of a simple or safe DIY project.
Ask The Metal Roofers for an energy consultation and tell us whether you would consider rooftop solar, ground-mounted solar or both. Bring a recent electric bill and your roof information if available. No roof climbing or measurements from a ladder are needed before the conversation.