Face panels true south (azimuth 180°) and set the tilt close to your latitude, from the 10° minimum in Kerala to 30° and above in Punjab and Jammu & Kashmir. Being within ±5° of the ideal angle costs less than 1% of yearly generation.
The Rule: Tilt Equals Latitude, Face True South
India lies entirely in the northern hemisphere, so fixed panels give their best annual output facing true south (azimuth 180°) at a tilt angle equal to the local latitude. Because the country spans about 8°N to 34°N, the right tilt ranges from near-flat in the deep south to steep in Kashmir. Two guardrails apply: never mount flatter than 10° (rain must clean the glass) and stay within ±5° of ideal, which costs under 1% of output.
City-Wise Optimum Tilt Angles
| City | Latitude | Fixed Tilt | Winter | Summer |
|---|---|---|---|---|
| Thiruvananthapuram | 8.5° | 10° | 24° | 5° |
| Kochi | 10.0° | 10° | 25° | 5° |
| Madurai | 9.9° | 10° | 25° | 5° |
| Coimbatore | 11.0° | 11° | 26° | 5° |
| Bengaluru | 13.0° | 13° | 28° | 5° |
| Chennai | 13.1° | 13° | 28° | 5° |
| Hubli | 15.4° | 15° | 30° | 5° |
| Hyderabad | 17.4° | 17° | 32° | 5° |
| Visakhapatnam | 17.7° | 18° | 33° | 5° |
| Pune | 18.5° | 19° | 34° | 5° |
| Mumbai | 19.1° | 19° | 34° | 5° |
| Nagpur | 21.1° | 21° | 36° | 6° |
| Surat | 21.2° | 21° | 36° | 6° |
| Kolkata | 22.6° | 23° | 38° | 8° |
| Indore | 22.7° | 23° | 38° | 8° |
| Ahmedabad | 23.0° | 23° | 38° | 8° |
| Bhopal | 23.3° | 23° | 38° | 8° |
| Ranchi | 23.3° | 23° | 38° | 8° |
| Udaipur | 24.6° | 25° | 40° | 10° |
| Patna | 25.6° | 26° | 41° | 11° |
| Varanasi | 25.3° | 25° | 40° | 10° |
| Guwahati | 26.1° | 26° | 41° | 11° |
| Gwalior | 26.2° | 26° | 41° | 11° |
| Jodhpur | 26.3° | 26° | 41° | 11° |
| Lucknow | 26.8° | 27° | 42° | 12° |
| Jaipur | 26.9° | 27° | 42° | 12° |
| Agra | 27.2° | 27° | 42° | 12° |
| New Delhi | 28.6° | 29° | 44° | 14° |
| Chandigarh | 30.7° | 31° | 46° | 16° |
| Amritsar | 31.6° | 32° | 47° | 17° |
| Jammu | 32.7° | 33° | 48° | 18° |
| Srinagar | 34.1° | 34° | 49° | 19° |
Any city not listed: use its latitude directly, or run it in the solar panel tilt angle calculator, which covers all 90+ cities in our database and accepts a raw latitude too.
Is Seasonal Adjustment Worth It?
Adjustable structures set latitude +15° in winter (October to February) and latitude −15° in summer (March to September). The annual gain is typically 4 to 8%. For a 3 kW home system that is roughly 150 to 300 extra units a year, which rarely justifies the costlier structure and the discipline of adjusting it twice a year. Fixed tilt at latitude is the sensible default for homes; seasonal mounting makes more sense for off-grid systems that are winter-critical.
How Much Does the Wrong Tilt Actually Cost?
| Deviation From Ideal | Annual Output Loss | On a 3kW System |
|---|---|---|
| ±5° | under 1% | ~40 units/yr: ignore it |
| ±10° | 2 – 3% | ~100 units/yr: minor |
| ±15° | 4 – 6% | ~210 units/yr: worth fixing at install time |
| Laid flat (0°) at 20°N+ | 8 – 12% + soiling | ~400+ units/yr and dirtier glass |
| Facing east or west instead of south | 10 – 15% | ~500 units/yr: the costliest common error |
The pattern is forgiving near the ideal and punishing far from it: chase orientation before angle, and never pay for a custom structure to correct a few degrees.
Mounting Rules That Protect Output
- Minimum 10° tilt so monsoon rain self-cleans the glass.
- True south, not magnetic south: compass south is offset by up to a few degrees of magnetic declination; installers correct for it.
- Row spacing: steeper tilts cast longer winter shadows, needing wider gaps between rows; this is why steep-tilt northern systems need slightly more roof per kW (check with the roof area calculator).
- Wind loading: above ~25° tilt on high roofs, structures need engineering attention in cyclonic zones.