Peak Sun Hours in Ðà Lạt, Lam Dong, Vietnam
- Solar zone
- Zone 4 (excellent)
- Best month
- April (6.2)
- Worst month
- December (4.4)
- Climate
- Tropical · 23.2°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 5.06 | 6.09 | 4.65 | 2.04 | 20.0 | 85 |
| Feb | 5.95 | 6.70 | 5.43 | 2.11 | 20.9 | 81 |
| Mar | 6.19 | 7.13 | 4.97 | 2.31 | 22.9 | 78 |
| Apr | 6.24 | 7.35 | 4.68 | 2.42 | 24.8 | 76 |
| May | 5.72 | 7.33 | 3.78 | 2.54 | 25.5 | 78 |
| Jun | 5.34 | 7.23 | 3.19 | 2.57 | 25.1 | 79 |
| Jul | 5.17 | 7.24 | 2.76 | 2.65 | 24.8 | 79 |
| Aug | 5.19 | 7.29 | 2.86 | 2.58 | 24.8 | 80 |
| Sep | 5.00 | 7.12 | 2.59 | 2.57 | 24.1 | 84 |
| Oct | 4.75 | 6.66 | 2.75 | 2.41 | 22.9 | 88 |
| Nov | 4.49 | 6.15 | 3.34 | 2.09 | 21.9 | 89 |
| Dec | 4.43 | 5.81 | 3.60 | 2.05 | 20.5 | 88 |
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 4.43 kWh/m²/day, 0.77 system efficiency.
About solar in Ðà Lạt
Ðà Lạt, Vietnam has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.29 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Ðà Lạt is April (spring) at 6.24 kWh/m²/day, and the weakest is December (winter) at 4.43 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.
Ðà Lạt'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 Ðà Lạt?
- Ðà Lạt averages 5.29 peak sun hours per day annually, ranging from 4.43 in December to 6.24 in April.
- How many solar panels do I need in Ðà Lạt?
- Panel count depends on your daily load. At Ðà Lạt's annual average of 5.29 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 Ðà Lạt?
- Sizing against Ðà Lạt's worst month (December, 4.43 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 Ðà Lạt's solar resource compare globally?
- Ðà Lạt sits in solar zone 4 out of 5 (where 5 is strongest) at 5.29 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 Ðà Lạt?
- Ðà Lạt's dry-season output peaks at 6.24 kWh/m²/day in April; the wet season drops it to 4.43 in December. That ~34% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Ðà Lạt?
- 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 Ðà Lạt?
- Ðà Lạt swings from 6.24 kWh/m²/day in April (dry) to 4.43 in December (wet) — roughly 34%. Year-round off-grid systems must size against the wet-season minimum.