Peak Sun Hours in Bannu, Khyber Pakhtunkhwa, Pakistan
- Solar zone
- Zone 4 (excellent)
- Best month
- May (7.1)
- Worst month
- December (3.1)
- Climate
- Tropical · 22.5°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.24 | 3.70 | 4.36 | 1.22 | 9.9 | 43 |
| Feb | 3.92 | 4.65 | 4.36 | 1.51 | 12.2 | 48 |
| Mar | 5.05 | 5.92 | 4.64 | 2.01 | 17.7 | 48 |
| Apr | 6.28 | 7.11 | 5.33 | 2.38 | 23.6 | 43 |
| May | 7.13 | 7.81 | 5.98 | 2.56 | 29.3 | 32 |
| Jun | 7.09 | 7.81 | 5.44 | 2.78 | 33.1 | 29 |
| Jul | 6.22 | 7.17 | 3.87 | 2.95 | 32.9 | 44 |
| Aug | 5.86 | 6.67 | 3.90 | 2.72 | 31.2 | 50 |
| Sep | 5.52 | 5.96 | 4.72 | 2.19 | 28.1 | 45 |
| Oct | 4.71 | 4.90 | 5.02 | 1.68 | 22.9 | 35 |
| Nov | 3.60 | 3.85 | 4.68 | 1.29 | 16.8 | 36 |
| Dec | 3.13 | 3.39 | 4.66 | 1.10 | 12.3 | 36 |
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 3.13 kWh/m²/day, 0.77 system efficiency.
About solar in Bannu
Bannu, Pakistan has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.15 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Bannu is May (spring) at 7.13 kWh/m²/day, and the weakest is December (winter) at 3.13 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.
Bannu'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 Bannu?
- Bannu averages 5.15 peak sun hours per day annually, ranging from 3.13 in December to 7.13 in May.
- How many solar panels do I need in Bannu?
- Panel count depends on your daily load. At Bannu's annual average of 5.15 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 Bannu?
- Sizing against Bannu's worst month (December, 3.13 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 Bannu's solar resource compare globally?
- Bannu sits in solar zone 4 out of 5 (where 5 is strongest) at 5.15 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 Bannu?
- Bannu's dry-season output peaks at 7.13 kWh/m²/day in May; the wet season drops it to 3.13 in December. That ~78% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Bannu?
- Most tier-1 PV panels are rated for 140+ mph wind loads; mounting hardware usually fails first. In cyclone-prone regions like Pakistan, specify IEC 61215-certified panels and anchor-bolt mounts rather than ballasted.
- What's the dry-to-wet output gap in Bannu?
- Bannu swings from 7.13 kWh/m²/day in May (dry) to 3.13 in December (wet) — roughly 78%. Year-round off-grid systems must size against the wet-season minimum.