Solar energy in Patna, India
Average irradiation 4.78 kWh/m²/day · ~1396 kWh per kWp per year
Monthly solar irradiation & temperature in Patna (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 3.19 | 15.6 | 77 |
| Feb | 4.47 | 20.0 | 109 |
| Mar | 5.70 | 26.2 | 139 |
| Apr | 6.38 | 32.2 | 155 |
| May | 6.36 | 35.0 | 155 |
| Jun | 5.49 | 34.6 | 134 |
| Jul | 4.59 | 30.4 | 112 |
| Aug | 4.86 | 29.2 | 118 |
| Sep | 4.65 | 28.0 | 113 |
| Oct | 4.60 | 25.5 | 112 |
| Nov | 3.97 | 20.9 | 97 |
| Dec | 3.11 | 16.5 | 76 |
Solar potential of Patna explained
Patna receives an average of 4.78 kilowatt-hours of solar energy per square metre per day, measured over four decades of satellite observation. In practical terms, every kilowatt-peak of installed PV capacity yields about 1396 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. This places Patna among the stronger solar locations globally — comparable to southern Spain or California.
Frequently asked questions
Is solar worth it in Patna?
With 4.78 kWh/m²/day of average irradiation, a 1 kWp system in Patna produces roughly 1396 kWh per year. That is an excellent solar resource — payback periods are typically among the shortest worldwide.
How much electricity would a 5 kW system produce in Patna?
Approximately 7,000 kWh per year — enough to cover a large share of a typical household's consumption.
What data is this based on?
Long-term satellite observations from NASA POWER (1981–present) and the PVGIS SARAH3 database, assuming a performance ratio of 80%.
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