About the Energy Generation
This estimates how much electricity a solar system will generate over a day, month, or year from its size, the local peak sun hours, and the system's performance ratio.
Formula
Annual energy (kWh) = P (kWp) × PSH (h/day) × 365 × PR
- P
- Installed capacity (kWp)
- PSH
- Peak sun hours per day (site-specific)
- PR
- Performance ratio (typically 0.75–0.85)
Worked example
A 5 kWp rooftop system at 5.5 PSH with a 0.80 PR generates about 5 × 5.5 × 365 × 0.80 ≈ 8,030 kWh/year.
What you can calculate
- City PSH presets
- PR factor
- Annual revenue
- Specific yield
Standards & references
Frequently asked questions
How much does 1 kW of solar generate per day in India?
Roughly 4–5 kWh per day for most of India (about 1,400–1,700 kWh per year per kW), depending on location, tilt, shading, and system quality.
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