Peak Sun Hours in Najafgarh, Delhi, India
- Solar zone
- Zone 3 (good)
- Best month
- May (6.8)
- Worst month
- December (3.0)
- Climate
- Tropical · 25.7°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.12 | 3.62 | 2.96 | 1.51 | 13.5 | 43 |
| Feb | 4.38 | 4.77 | 4.30 | 1.77 | 17.3 | 40 |
| Mar | 5.66 | 6.05 | 5.22 | 2.03 | 23.5 | 32 |
| Apr | 6.60 | 7.00 | 5.30 | 2.49 | 30.2 | 24 |
| May | 6.75 | 7.22 | 4.56 | 2.88 | 34.9 | 24 |
| Jun | 6.13 | 6.92 | 3.29 | 3.06 | 35.8 | 36 |
| Jul | 5.23 | 6.63 | 2.30 | 2.95 | 32.7 | 59 |
| Aug | 5.09 | 6.44 | 2.67 | 2.70 | 30.3 | 71 |
| Sep | 5.22 | 5.90 | 3.91 | 2.25 | 28.7 | 66 |
| Oct | 4.70 | 4.82 | 4.15 | 1.90 | 25.6 | 47 |
| Nov | 3.60 | 3.73 | 3.36 | 1.63 | 20.3 | 40 |
| Dec | 3.05 | 3.31 | 3.24 | 1.38 | 15.3 | 40 |
GHI, Clear-sky, DNI, DHI in kWh/m²/day. Data: NASA POWER climatology (long-term monthly averages).
Off-grid calculator
Add appliances
- Add an appliance to size a system.
Sizing
- Daily load
- 0.00 kWh
- Panel wattage
- 0 W
- Panel count (400W modules)
- 0
- Battery bank
- 0.0 kWh
Sizing against worst-month PSH of 3.05 kWh/m²/day, 0.77 system efficiency.
About solar in Najafgarh
Najafgarh, India has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 4.96 kWh/m²/day, a good solar resource by global standards.
The strongest month in Najafgarh is May (spring) at 6.75 kWh/m²/day, and the weakest is December (winter) at 3.05 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the December value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Najafgarh's solar conditions are well within the range where off-grid PV is a straightforward engineering exercise with standard-sized arrays and lithium batteries.
FAQ
- What are the peak sun hours in Najafgarh?
- Najafgarh averages 4.96 peak sun hours per day annually, ranging from 3.05 in December to 6.75 in May.
- How many solar panels do I need in Najafgarh?
- Panel count depends on your daily load. At Najafgarh's annual average of 4.96 kWh/m²/day, a 5 kWh/day load needs roughly 4 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Najafgarh?
- Sizing against Najafgarh's worst month (December, 3.05 kWh/m²/day) with 2 days of autonomy at 80% depth of discharge, a 5 kWh/day load needs about a 12.5 kWh battery bank.
- How does Najafgarh's solar resource compare globally?
- Najafgarh sits in solar zone 3 out of 5 (where 5 is strongest) at 4.96 kWh/m²/day — good by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- How does the wet season affect solar generation in Najafgarh?
- Najafgarh's dry-season output peaks at 6.75 kWh/m²/day in May; the wet season drops it to 3.05 in December. That ~75% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Najafgarh?
- Most tier-1 PV panels are rated for 140+ mph wind loads; mounting hardware usually fails first. In cyclone-prone regions like India, specify IEC 61215-certified panels and anchor-bolt mounts rather than ballasted.
- What's the dry-to-wet output gap in Najafgarh?
- Najafgarh swings from 6.75 kWh/m²/day in May (dry) to 3.05 in December (wet) — roughly 75%. Year-round off-grid systems must size against the wet-season minimum.