Peak Sun Hours in Qui Nhon, Gia Lai, Vietnam
- Solar zone
- Zone 4 (excellent)
- Best month
- May (6.2)
- Worst month
- December (3.2)
- Climate
- Tropical · 26.8°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.91 | 5.68 | 3.28 | 1.80 | 23.6 | 82 |
| Feb | 4.88 | 6.26 | 4.02 | 1.99 | 23.9 | 83 |
| Mar | 5.56 | 6.67 | 4.22 | 2.21 | 25.3 | 83 |
| Apr | 6.16 | 6.98 | 4.64 | 2.38 | 27.0 | 83 |
| May | 6.20 | 7.13 | 4.68 | 2.40 | 28.6 | 82 |
| Jun | 5.91 | 7.16 | 4.31 | 2.45 | 29.0 | 80 |
| Jul | 5.75 | 7.17 | 3.96 | 2.49 | 28.9 | 79 |
| Aug | 5.60 | 7.16 | 3.80 | 2.43 | 29.0 | 79 |
| Sep | 5.27 | 6.89 | 3.51 | 2.37 | 28.4 | 81 |
| Oct | 4.36 | 6.31 | 2.74 | 2.14 | 27.2 | 83 |
| Nov | 3.70 | 5.72 | 2.75 | 1.77 | 26.2 | 84 |
| Dec | 3.23 | 5.36 | 2.44 | 1.66 | 24.6 | 83 |
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 3.23 kWh/m²/day, 0.77 system efficiency.
About solar in Qui Nhon
Qui Nhon, Vietnam has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.04 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Qui Nhon is May (spring) at 6.2 kWh/m²/day, and the weakest is December (winter) at 3.23 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.
Qui Nhon'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 Qui Nhon?
- Qui Nhon averages 5.04 peak sun hours per day annually, ranging from 3.23 in December to 6.2 in May.
- How many solar panels do I need in Qui Nhon?
- Panel count depends on your daily load. At Qui Nhon's annual average of 5.04 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 Qui Nhon?
- Sizing against Qui Nhon's worst month (December, 3.23 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 Qui Nhon's solar resource compare globally?
- Qui Nhon sits in solar zone 4 out of 5 (where 5 is strongest) at 5.04 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 Qui Nhon?
- Qui Nhon's dry-season output peaks at 6.2 kWh/m²/day in May; the wet season drops it to 3.23 in December. That ~59% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Qui Nhon?
- Most tier-1 PV panels are rated for 140+ mph wind loads; mounting hardware usually fails first. In cyclone-prone regions like Vietnam, specify IEC 61215-certified panels and anchor-bolt mounts rather than ballasted.
- What's the dry-to-wet output gap in Qui Nhon?
- Qui Nhon swings from 6.2 kWh/m²/day in May (dry) to 3.23 in December (wet) — roughly 59%. Year-round off-grid systems must size against the wet-season minimum.