Peak Sun Hours in Brāhmanbāria, Chittagong, Bangladesh
- Solar zone
- Zone 3 (good)
- Best month
- April (5.5)
- Worst month
- December (4.0)
- Climate
- Tropical · 25.2°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.18 | 4.61 | 4.83 | 1.49 | 17.7 | 65 |
| Feb | 5.01 | 5.38 | 5.20 | 1.74 | 21.4 | 56 |
| Mar | 5.47 | 6.14 | 4.43 | 2.32 | 26.3 | 53 |
| Apr | 5.55 | 6.74 | 3.44 | 2.84 | 28.8 | 67 |
| May | 5.20 | 6.98 | 2.53 | 2.94 | 28.9 | 78 |
| Jun | 4.49 | 7.05 | 1.60 | 2.86 | 28.3 | 88 |
| Jul | 4.52 | 7.22 | 1.56 | 2.97 | 28.1 | 90 |
| Aug | 4.72 | 6.96 | 1.84 | 3.04 | 28.1 | 89 |
| Sep | 4.56 | 6.36 | 2.38 | 2.72 | 27.7 | 88 |
| Oct | 4.59 | 5.68 | 3.95 | 1.99 | 26.1 | 84 |
| Nov | 4.57 | 4.95 | 5.74 | 1.36 | 22.5 | 79 |
| Dec | 3.98 | 4.42 | 5.09 | 1.32 | 18.9 | 74 |
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 3.98 kWh/m²/day, 0.77 system efficiency.
About solar in Brāhmanbāria
Brāhmanbāria, Bangladesh has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 4.74 kWh/m²/day, a good solar resource by global standards.
The strongest month in Brāhmanbāria is April (spring) at 5.55 kWh/m²/day, and the weakest is December (winter) at 3.98 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.
Brāhmanbāria'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 Brāhmanbāria?
- Brāhmanbāria averages 4.74 peak sun hours per day annually, ranging from 3.98 in December to 5.55 in April.
- How many solar panels do I need in Brāhmanbāria?
- Panel count depends on your daily load. At Brāhmanbāria's annual average of 4.74 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 Brāhmanbāria?
- Sizing against Brāhmanbāria's worst month (December, 3.98 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 Brāhmanbāria's solar resource compare globally?
- Brāhmanbāria sits in solar zone 3 out of 5 (where 5 is strongest) at 4.74 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 Brāhmanbāria?
- Brāhmanbāria's dry-season output peaks at 5.55 kWh/m²/day in April; the wet season drops it to 3.98 in December. That ~33% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Brāhmanbāria?
- 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 Brāhmanbāria?
- Brāhmanbāria swings from 5.55 kWh/m²/day in April (dry) to 3.98 in December (wet) — roughly 33%. Year-round off-grid systems must size against the wet-season minimum.