Peak Sun Hours in Hà Tĩnh, Hà Tĩnh Province, Vietnam
- Solar zone
- Zone 2 (moderate)
- Best month
- June (5.2)
- Worst month
- December (2.5)
- Climate
- Tropical · 24.9°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 2.73 | 5.11 | 2.33 | 1.33 | 18.0 | 86 |
| Feb | 3.26 | 5.57 | 2.15 | 1.64 | 20.3 | 82 |
| Mar | 3.54 | 5.90 | 1.60 | 1.93 | 23.5 | 78 |
| Apr | 4.48 | 6.54 | 2.24 | 2.26 | 27.4 | 72 |
| May | 5.18 | 7.13 | 2.88 | 2.52 | 29.4 | 71 |
| Jun | 5.22 | 7.29 | 2.83 | 2.65 | 29.9 | 72 |
| Jul | 4.96 | 7.32 | 2.63 | 2.51 | 29.6 | 73 |
| Aug | 4.58 | 7.13 | 2.13 | 2.43 | 28.5 | 80 |
| Sep | 4.19 | 6.63 | 2.12 | 2.21 | 27.2 | 84 |
| Oct | 3.40 | 5.83 | 1.94 | 1.78 | 24.8 | 87 |
| Nov | 3.07 | 5.19 | 2.53 | 1.43 | 22.1 | 86 |
| Dec | 2.53 | 4.82 | 2.24 | 1.25 | 18.5 | 86 |
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 2.53 kWh/m²/day, 0.77 system efficiency.
About solar in Hà Tĩnh
Hà Tĩnh, Vietnam has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 3.93 kWh/m²/day, a moderate solar resource by global standards.
The strongest month in Hà Tĩnh is June (summer) at 5.22 kWh/m²/day, and the weakest is December (winter) at 2.53 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.
Given the moderate resource, Hà Tĩnh installations typically oversize panels or combine solar with another source (grid, generator, hydro) for reliability.
FAQ
- What are the peak sun hours in Hà Tĩnh?
- Hà Tĩnh averages 3.93 peak sun hours per day annually, ranging from 2.53 in December to 5.22 in June.
- How many solar panels do I need in Hà Tĩnh?
- Panel count depends on your daily load. At Hà Tĩnh's annual average of 3.93 kWh/m²/day, a 5 kWh/day load needs roughly 5 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Hà Tĩnh?
- Sizing against Hà Tĩnh's worst month (December, 2.53 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 Hà Tĩnh's solar resource compare globally?
- Hà Tĩnh sits in solar zone 2 out of 5 (where 5 is strongest) at 3.93 kWh/m²/day — moderate 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 Hà Tĩnh?
- Hà Tĩnh's dry-season output peaks at 5.22 kWh/m²/day in June; the wet season drops it to 2.53 in December. That ~68% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Hà Tĩnh?
- 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 Hà Tĩnh?
- Hà Tĩnh swings from 5.22 kWh/m²/day in June (dry) to 2.53 in December (wet) — roughly 68%. Year-round off-grid systems must size against the wet-season minimum.