What Happens During a Solar Site Visit? Complete Walkthrough

What Is a Solar Site Visit?

The visit evaluates what we cover in our solar roof assessment guide.

A solar site visit is a comprehensive physical evaluation of your property conducted by a solar professional to determine solar feasibility, design an optimal system, and prepare an accurate proposal. While initial consultations may use satellite imagery and remote analysis, the site visit provides detailed, property-specific information that remote assessment cannot match. This hands-on evaluation is essential for accurate system design, realistic production estimates, and identifying potential challenges before installation begins.

Site visits typically take 30 to 90 minutes depending on property complexity. A trained technician or designer examines your roof, electrical system, surrounding property, and shading conditions. They collect measurements, photographs, and detailed notes that inform the system design and proposal. Understanding what happens during this visit helps you prepare adequately and get maximum value from the assessment.

What They Evaluate

The assessment feeds into the complete installation process.

Roof Assessment

The technician thoroughly examines your roof, measuring dimensions, pitch, and orientation. They identify usable areas free from obstructions and calculate available space after accounting for required fire code setbacks (typically 3 feet from ridges and edges). They note roof material, condition, and any signs of wear that might need addressing before solar installation.

Structural evaluation includes examining rafter or truss spacing from the attic, checking roof deck condition, and confirming the structure can support additional loads of 2 to 4 pounds per square foot. They identify any structural concerns that might require reinforcement.

Photographs document roof condition, obstructions (chimneys, vents, skylights), and surrounding structures. These images support the design team and serve as references during installation planning.

Shading Analysis

Using specialized tools like the Solar Pathfinder, Sun Eye, or drone-mounted sensors, the technician measures shading at multiple points across your roof. These tools track the sun's path throughout the year and identify shading from trees, neighboring buildings, chimneys, and other obstructions.

The shading analysis produces quantitative data showing what percentage of sunlight each roof area receives annually. This information directly impacts production estimates and panel placement decisions. Areas with heavy shading may be excluded from the design, or the installer may recommend microinverters or power optimizers to mitigate shading losses.

The technician also evaluates trees near your property, noting species and growth rates that might affect future shading as trees mature. They may recommend tree trimming or removal to improve solar access.

Electrical System Evaluation

The technician inspects your main electrical panel, noting manufacturer, amperage rating, available breaker spaces, and overall condition. They determine whether your panel can accommodate solar interconnection or if an upgrade is needed. Common findings include full panels requiring expansion, outdated fuse boxes needing replacement, or insufficient amperage for larger systems.

They trace the path from electrical panel to roof, identifying optimal routes for conduit runs. They note any obstacles or aesthetic concerns with proposed wiring paths. They also verify that your home's grounding system meets current code requirements.

If battery storage is being considered, they evaluate additional electrical requirements including critical loads panel placement and backup circuit selection.

How to Prepare

Maximize the value of your site visit with these preparations:

• Have 12 months of electric bills ready: Shows seasonal usage patterns and helps size the system appropriately
• Clear attic access: Technicians need to examine roof structure from inside
• Note any roof concerns: Point out leaks, repairs, or warranty information
• Identify your goals: 100% offset, budget limitations, battery interest, future EV plans
• Clear driveway and yard access: Allows technicians to view all roof facets and evaluate ground mount potential if desired
• List questions: Prepare questions about equipment, timeline, financing, and warranties
• Check HOA requirements: If applicable, have CC&Rs available for review

What to Ask During the Visit

The site visit is your opportunity to evaluate the installer's expertise and professionalism. Ask questions like:

• What panel placement do you recommend and why?
• How much shading do you measure, and how will it affect production?
• Will my electrical panel need upgrading?
• Do you see any roof concerns I should address?
• What's the optimal system size for my usage and roof?
• Are there any challenges or additional costs you anticipate?
• Can you show me monitoring examples from similar installations?
• How does your design account for future tree growth?

After the Site Visit

Choose carefully. How to choose a solar installer.

Within 2 to 7 days of the site visit, you should receive a detailed proposal including:

• System design showing panel placement on your roof
• Equipment specifications and datasheets
• Expected annual and monthly production estimates
• Total cost, available incentives, and financing options
• Projected savings and payback period
• Timeline estimate from contract to activation
• Warranty terms and monitoring included

Compare proposals from multiple installers who each conduct thorough site visits. If a proposal seems based solely on satellite imagery without a site visit, request one before committing. Accurate designs require hands-on evaluation that remote tools alone cannot provide.

Virtual Site Assessments

Some installers now offer virtual site assessments using high-resolution satellite imagery, drone photography, and homeowner-guided video calls. These can provide accurate preliminary designs for straightforward properties and reduce initial visit requirements. However, for complex roofs, unusual electrical configurations, or heavily shaded properties, in-person site visits remain essential for accurate assessment.

Virtual assessments work best as initial screening tools, with in-person visits reserved for properties where remote analysis indicates complexity or uncertainty. As remote sensing technology improves, virtual assessments will likely handle an increasing percentage of residential solar evaluations.