“Make solar decisions using real numbers — not sales promises.“
Size, design, and find the solar ROI in minutes
What is Solar Feasibility Spreadsheet (SFS)?
The Solar Feasibility Spreadsheet (SFS) is a comprehensive Excel-based tool that helps homeowners design the right solar system and evaluate its financial feasibility — before investing in rooftop solar.
SFS combines three critical aspects of a solar decision:
Technical design, location-specific energy estimation, and financial feasibility, all in one place.
It helps determine:
- Correct system size, number of panels, and inverter sizing
- Location-accurate solar generation using district/county PSH data
- Long-term financial feasibility using real-term modeling
- How financing choices (debt vs equity) affect cash flows
SFS is built for people who want to understand the reality of going solar, not just the headline numbers.
What Problem Does SFS Solve?
Most solar decisions go wrong because of:
- Incorrect system sizing
- Generic energy estimates
- Over-optimistic ROI and payback claims
- Confusion between feasibility and loan affordability
SFS replaces guesswork and sales assumptions with technical and financial clarity, allowing homeowners to make informed decisions.
How Does SFS Work?
SFS guides you step-by-step:
- Select your district (India) or county (USA)
- Enter your last 12 months of electricity usage
- Get the correct system size and expected generation
- Choose panel technology and temperature conditions for inverter sizing
- Enter system cost and applicable subsidy
- Review grid price and maintenance assumptions
- Get full technical and financial outputs (NPV, ROI, IRR, payback)
- See how results change when a loan is used
Everything is transparent and based on real-term calculations.
What makes SFS different from other calculators?
- Design-first approach, not cost-first
- District/county-level solar data, not averages
- Inflation-adjusted financial modeling
- Lifecycle costs included explicitly
- Feasibility and financing clearly separated
- Fully transparent Excel-based calculations
SFS focuses on decision quality, not marketing speed.
Country Specific Additions
Solar economics vary widely by country.
That’s why SFS is developed as country-specific editions with realistic local assumptions.
Available editions:
Each edition uses local cost benchmarks, appropriate discount rates, and the same core financial methodology.
Future Country Support
SFS is designed as a global framework.
More country editions will be added over time, following the same transparent approach.
Who is SFS for?
SFS is ideal for homeowners, serious buyers, engineers, and finance-aware users who want clarity before investing.
It is not meant for quick marketing estimates or guaranteed savings claims.
Choose Your Edition
Each edition includes guided inputs, example values, safe defaults, and clear explanations.
Final Thought
SFS helps you decide whether solar is a good investment — before you spend thousands on installation.
Don’t wait anymore, keep this tool in your arsenal and start using it
