Peak Sun Hours in Ludhiana, Punjab, India
- Solar zone
- Zone 4 (excellent)
- Best month
- May (7.0)
- Worst month
- December (3.0)
- Climate
- Tropical · 25.3°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.08 | 3.76 | 3.40 | 1.41 | 12.4 | 46 |
| Feb | 4.21 | 4.79 | 4.41 | 1.70 | 16.1 | 46 |
| Mar | 5.49 | 6.03 | 5.19 | 2.00 | 22.2 | 39 |
| Apr | 6.44 | 7.07 | 5.31 | 2.60 | 28.9 | 30 |
| May | 6.96 | 7.44 | 5.41 | 2.68 | 34.5 | 23 |
| Jun | 6.41 | 7.18 | 4.20 | 2.83 | 36.0 | 33 |
| Jul | 5.54 | 6.61 | 2.77 | 2.95 | 33.6 | 55 |
| Aug | 5.47 | 6.48 | 3.24 | 2.72 | 31.5 | 64 |
| Sep | 5.31 | 5.92 | 4.32 | 2.23 | 29.2 | 60 |
| Oct | 4.72 | 4.89 | 4.69 | 1.82 | 25.4 | 44 |
| Nov | 3.67 | 3.88 | 4.16 | 1.48 | 19.5 | 40 |
| Dec | 3.04 | 3.42 | 3.81 | 1.26 | 14.4 | 42 |
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 3.04 kWh/m²/day, 0.77 system efficiency.
About solar in Ludhiana
Ludhiana, India has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.03 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Ludhiana is May (spring) at 6.96 kWh/m²/day, and the weakest is December (winter) at 3.04 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.
Ludhiana'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 Ludhiana?
- Ludhiana averages 5.03 peak sun hours per day annually, ranging from 3.04 in December to 6.96 in May.
- How many solar panels do I need in Ludhiana?
- Panel count depends on your daily load. At Ludhiana's annual average of 5.03 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 Ludhiana?
- Sizing against Ludhiana's worst month (December, 3.04 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 Ludhiana's solar resource compare globally?
- Ludhiana sits in solar zone 4 out of 5 (where 5 is strongest) at 5.03 kWh/m²/day — excellent 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 Ludhiana?
- Ludhiana's dry-season output peaks at 6.96 kWh/m²/day in May; the wet season drops it to 3.04 in December. That ~78% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Ludhiana?
- 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 Ludhiana?
- Ludhiana swings from 6.96 kWh/m²/day in May (dry) to 3.04 in December (wet) — roughly 78%. Year-round off-grid systems must size against the wet-season minimum.