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Rooftop Solar Pre-Feasibility: What Data Matter Before Panel Count?
Assess electricity-use patterns, roof conditions and grid connection before treating a rooftop solar estimate as an investment decision.
A large roof may look promising for solar PV, but usable space and technically or economically viable capacity are not the same. A pre-feasibility study should begin with the organisation's needs and the information still missing.
Start with consumption, not panel count
Annual electricity consumption alone cannot show how well generation will match demand. Compare hourly and seasonal use where data permit: an office, a campus with a quiet summer and a continuously operating factory have different profiles. If only monthly bills exist, state that limitation. Treat planned production growth as a scenario, not as current demand.
Verify the roof on site
Satellite images and drawings support an initial estimate, but rooftop equipment, shade, access and maintenance routes need a site check. Qualified specialists should assess structural capacity and roof condition. A pre-feasibility study is not a structural-suitability report or a construction design.
Check the connection route
On 1 October 2026, TEİAŞ published a table of remaining unlicensed solar and wind generation capacity by transformer centre at distribution level. This general table is not a connection approval for an individual building. Collect the facility's connection information and electrical drawings; document the sources and dates behind assumptions, and plan the formal process with the relevant authorities.
Explain production and financial assumptions
Expected output depends on location, orientation, shading, layout and equipment. Record the data source, method and assumed losses. Compare alternative capacities and layouts as estimates, not guaranteed production. Include maintenance, monitoring, insurance, possible replacements and operational impacts alongside initial investment. A single payback period is not a certain outcome; test how electricity prices, costs and self-consumption assumptions change it.
Plan monitoring from the start
Define how generation, consumption, availability and maintenance will be recorded, and who investigates deviations. Distinguish missing data from a genuine drop in production. A useful first deliverable is a list of data gaps, specialist assessments and comparable scenarios. Yörünge Kurumsal can link PV pre-feasibility with energy audits, consumption analysis and digital monitoring; detailed design, technical assessments and approvals remain with qualified specialists and authorised bodies.