Peak Sun Hours in Barishal, Barisal Division, Bangladesh
- Solar zone
- Zone 3 (good)
- Best month
- April (5.7)
- Worst month
- December (3.7)
- Climate
- Tropical · 25.7°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.86 | 4.23 | 3.45 | 1.76 | 18.3 | 70 |
| Feb | 4.77 | 5.10 | 4.14 | 1.99 | 22.2 | 63 |
| Mar | 5.37 | 5.91 | 3.93 | 2.45 | 26.8 | 62 |
| Apr | 5.65 | 6.58 | 3.48 | 2.84 | 29.1 | 71 |
| May | 5.37 | 6.84 | 2.84 | 2.91 | 29.4 | 79 |
| Jun | 4.20 | 6.89 | 1.55 | 2.68 | 28.8 | 88 |
| Jul | 4.11 | 7.11 | 1.45 | 2.75 | 28.2 | 90 |
| Aug | 4.33 | 6.88 | 1.58 | 2.88 | 28.0 | 90 |
| Sep | 4.19 | 6.31 | 2.01 | 2.57 | 27.9 | 89 |
| Oct | 4.37 | 5.53 | 3.32 | 2.07 | 26.7 | 84 |
| Nov | 4.24 | 4.65 | 4.23 | 1.69 | 23.2 | 80 |
| Dec | 3.67 | 4.02 | 3.58 | 1.61 | 19.4 | 78 |
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 3.67 kWh/m²/day, 0.77 system efficiency.
About solar in Barishal
Barishal, Bangladesh has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 4.51 kWh/m²/day, a good solar resource by global standards.
The strongest month in Barishal is April (spring) at 5.65 kWh/m²/day, and the weakest is December (winter) at 3.67 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.
Barishal'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 Barishal?
- Barishal averages 4.51 peak sun hours per day annually, ranging from 3.67 in December to 5.65 in April.
- How many solar panels do I need in Barishal?
- Panel count depends on your daily load. At Barishal's annual average of 4.51 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 Barishal?
- Sizing against Barishal's worst month (December, 3.67 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 Barishal's solar resource compare globally?
- Barishal sits in solar zone 3 out of 5 (where 5 is strongest) at 4.51 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 Barishal?
- Barishal's dry-season output peaks at 5.65 kWh/m²/day in April; the wet season drops it to 3.67 in December. That ~44% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Barishal?
- 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 Barishal?
- Barishal swings from 5.65 kWh/m²/day in April (dry) to 3.67 in December (wet) — roughly 44%. Year-round off-grid systems must size against the wet-season minimum.