Peak Sun Hours in Nha Trang, Khanh Hoa, Vietnam
- Solar zone
- Zone 4 (excellent)
- Best month
- April (6.3)
- Worst month
- December (3.4)
- Climate
- Tropical · 26.8°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.04 | 5.84 | 3.49 | 1.80 | 24.2 | 83 |
| Feb | 5.11 | 6.44 | 4.43 | 1.98 | 24.5 | 82 |
| Mar | 5.71 | 6.88 | 4.56 | 2.15 | 25.9 | 81 |
| Apr | 6.30 | 7.15 | 4.97 | 2.29 | 27.6 | 80 |
| May | 6.14 | 7.18 | 4.67 | 2.39 | 28.6 | 81 |
| Jun | 5.84 | 7.13 | 4.17 | 2.48 | 28.4 | 82 |
| Jul | 5.71 | 7.14 | 3.83 | 2.54 | 28.0 | 83 |
| Aug | 5.71 | 7.15 | 3.84 | 2.50 | 28.1 | 82 |
| Sep | 5.39 | 6.95 | 3.49 | 2.47 | 28.1 | 82 |
| Oct | 4.44 | 6.45 | 2.85 | 2.14 | 27.3 | 83 |
| Nov | 3.86 | 5.91 | 2.89 | 1.82 | 26.4 | 85 |
| Dec | 3.37 | 5.57 | 2.63 | 1.68 | 25.0 | 85 |
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 3.37 kWh/m²/day, 0.77 system efficiency.
About solar in Nha Trang
Nha Trang, Vietnam has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.14 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Nha Trang is April (spring) at 6.3 kWh/m²/day, and the weakest is December (winter) at 3.37 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.
Nha Trang'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 Nha Trang?
- Nha Trang averages 5.14 peak sun hours per day annually, ranging from 3.37 in December to 6.3 in April.
- How many solar panels do I need in Nha Trang?
- Panel count depends on your daily load. At Nha Trang's annual average of 5.14 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 Nha Trang?
- Sizing against Nha Trang's worst month (December, 3.37 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 Nha Trang's solar resource compare globally?
- Nha Trang sits in solar zone 4 out of 5 (where 5 is strongest) at 5.14 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 Nha Trang?
- Nha Trang's dry-season output peaks at 6.3 kWh/m²/day in April; the wet season drops it to 3.37 in December. That ~57% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Nha Trang?
- 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 Nha Trang?
- Nha Trang swings from 6.3 kWh/m²/day in April (dry) to 3.37 in December (wet) — roughly 57%. Year-round off-grid systems must size against the wet-season minimum.