Quick Reference: Solar Output in India
- Per kW: about 4 units a day, 120 a month, 1,400 to 1,500 a year in a typical city.
- Best regions: Rajasthan and Gujarat (5.3 to 5.8 peak sun hours); lowest: hill and far-eastern states (3.5 to 4.0).
- Seasonality: monsoon runs 30 to 40% below average; March to May above.
- Degradation: about 0.5% per year; quality panels keep ~88% output at year 25.
The generation calculator applies your exact city, while the kW pages package everything (cost, subsidy, panels, output) for a fixed size. To convert generation into rupees, continue to the savings and payback calculator.
What "Good" Output Looks Like: Benchmarks to Judge Any System
| Units per kW per Day | Verdict | Action |
|---|---|---|
| 4.2 or more | Excellent | High-sun region or a very clean system; nothing to do |
| 3.6 – 4.2 | Healthy | Normal for most Indian cities; keep the monthly log |
| 3.0 – 3.6 | Watch | Fine in low-sun regions or monsoon; elsewhere, clean the panels |
| Below 3.0 | Investigate | Soiling, new shading or a string fault; compare strings, call service |
Divide your inverter's monthly kWh by system kW and by 30 to get your own figure, then judge it against your city's expected value in the generation calculator rather than against the national table alone.