Energy Yield Estimator
Annual kWh generation & specific yield (PVWatts-style check)
Free · No sign-up · Computed instantly on your device
System & Site Inputs
The fast generation check every designer runs before committing to a proposal.
PR bundles temperature, soiling, wiring, inverter and mismatch losses. Indian rooftops usually land at 75–80%. For a bankable figure, model hourly weather in PVsyst — this is the pre-design sanity check.
Estimated annual generation
14,804kWh
≈ 40.6 units/day · 1,234 units/month
Specific yield
1,480
kWh/kWp/year
Monthly average
1,234
units/month
CO₂ offset
10.5 t
per year
About This Calculator
The Energy Yield Estimator is the sanity check every solar designer runs before committing numbers to a proposal: kWp × peak sun hours × performance ratio. It converts a system size into daily, monthly, and annual units (kWh), plus the specific yield figure (kWh/kWp/year) that professionals use to benchmark whether a design — or an installed plant — is performing as it should.
Peak sun hour presets are included for major Indian cities, and the performance ratio slider lets you model everything from a poorly-ventilated tin-shed install (~65%) to an optimised elevated array (~82%). Indian rooftops typically achieve a specific yield of 1,400–1,700 kWh/kWp/year; if a vendor quote implies more, ask why.
Frequently Asked Questions
- What Is a Good Specific Yield in India?
- 1,400–1,700 kWh/kWp/year for fixed rooftop systems, varying by region — Rajasthan and Gujarat sit at the top of the band, the eastern and northeastern states lower. Below 1,300 usually indicates shading, soiling, or design problems.
- What Performance Ratio Should I Assume?
- 75–80% is typical for a well-designed Indian rooftop. Use lower values for flush-mounted tin-shed systems with poor airflow, higher only for elevated, well-ventilated arrays that are cleaned regularly.