Panel count and roof area
Check how many panels fit and whether the roof is large enough.
Updated 2026-07-15 · Formula version is shown with every result.
Data confidence
Moderate
Evidence used
Uses target system size, panel dimensions, roof dimensions, slope, setbacks, and obstruction allowance.
What can vary
Structural capacity, exact roof geometry, access paths, fire rules, and shading need a site inspection.
Your inputs
Use realistic values. Nothing is sent to an ad network.
Your estimate will appear here
Results include ranges, supporting metrics, formula version, assumptions, and warnings.
How this estimate works
SolarGabay uses pure, versioned TypeScript formula modules. The calculator normalizes inputs, rejects invalid values, and presents planning ranges instead of false precision.
Results are decision-support estimates. Confirm utility rates, supplier specifications, site conditions, and professional requirements before committing money. Review the methodology and source policy before treating any estimate as decision-ready.