Peak Sun Hours in Cox’s Bāzār, Chittagong, Bangladesh
- Solar zone
- Zone 3 (good)
- Best month
- April (6.1)
- Worst month
- July (3.9)
- Climate
- Tropical · 26.2°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.67 | 4.95 | 5.76 | 1.44 | 20.8 | 70 |
| Feb | 5.43 | 5.72 | 5.93 | 1.68 | 22.8 | 69 |
| Mar | 5.93 | 6.39 | 5.22 | 2.21 | 25.9 | 73 |
| Apr | 6.07 | 6.92 | 4.38 | 2.62 | 27.9 | 78 |
| May | 5.40 | 7.10 | 3.01 | 2.84 | 28.7 | 82 |
| Jun | 4.23 | 7.10 | 1.48 | 2.71 | 28.6 | 87 |
| Jul | 3.92 | 7.25 | 1.08 | 2.71 | 28.0 | 89 |
| Aug | 4.20 | 7.03 | 1.35 | 2.82 | 27.9 | 89 |
| Sep | 4.47 | 6.51 | 2.14 | 2.72 | 28.1 | 86 |
| Oct | 4.59 | 5.84 | 3.84 | 2.03 | 27.8 | 80 |
| Nov | 4.63 | 5.14 | 5.54 | 1.44 | 25.4 | 75 |
| Dec | 4.31 | 4.67 | 5.48 | 1.37 | 22.3 | 73 |
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 3.92 kWh/m²/day, 0.77 system efficiency.
About solar in Cox’s Bāzār
Cox’s Bāzār, Bangladesh has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 4.82 kWh/m²/day, a good solar resource by global standards.
The strongest month in Cox’s Bāzār is April (spring) at 6.07 kWh/m²/day, and the weakest is July (summer) at 3.92 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the July value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Cox’s Bāzār'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 Cox’s Bāzār?
- Cox’s Bāzār averages 4.82 peak sun hours per day annually, ranging from 3.92 in July to 6.07 in April.
- How many solar panels do I need in Cox’s Bāzār?
- Panel count depends on your daily load. At Cox’s Bāzār's annual average of 4.82 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 Cox’s Bāzār?
- Sizing against Cox’s Bāzār's worst month (July, 3.92 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 Cox’s Bāzār's solar resource compare globally?
- Cox’s Bāzār sits in solar zone 3 out of 5 (where 5 is strongest) at 4.82 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 Cox’s Bāzār?
- Cox’s Bāzār's dry-season output peaks at 6.07 kWh/m²/day in April; the wet season drops it to 3.92 in July. That ~45% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Cox’s Bāzār?
- Most tier-1 PV panels are rated for 140+ mph wind loads; mounting hardware usually fails first. In cyclone-prone regions like Bangladesh, specify IEC 61215-certified panels and anchor-bolt mounts rather than ballasted.
- What's the dry-to-wet output gap in Cox’s Bāzār?
- Cox’s Bāzār swings from 6.07 kWh/m²/day in April (dry) to 3.92 in July (wet) — roughly 45%. Year-round off-grid systems must size against the wet-season minimum.