Peak Sun Hours in Nghi Sơn, Thanh Hóa Province, Vietnam
- Solar zone
- Zone 2 (moderate)
- Best month
- June (5.5)
- Worst month
- January (2.5)
- Climate
- Tropical · 23.9°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 2.46 | 4.77 | 1.50 | 1.39 | 17.0 | 85 |
| Feb | 2.93 | 5.31 | 1.45 | 1.66 | 18.9 | 85 |
| Mar | 3.20 | 5.56 | 1.05 | 1.94 | 21.6 | 85 |
| Apr | 4.28 | 6.32 | 1.84 | 2.31 | 24.9 | 83 |
| May | 5.36 | 7.10 | 3.09 | 2.58 | 27.7 | 81 |
| Jun | 5.50 | 7.28 | 3.13 | 2.78 | 28.8 | 81 |
| Jul | 5.21 | 7.31 | 2.92 | 2.62 | 28.7 | 82 |
| Aug | 4.73 | 7.07 | 2.34 | 2.48 | 28.1 | 84 |
| Sep | 4.37 | 6.51 | 2.30 | 2.26 | 27.1 | 85 |
| Oct | 3.64 | 5.55 | 1.99 | 1.95 | 24.6 | 85 |
| Nov | 3.25 | 4.93 | 2.41 | 1.61 | 21.6 | 84 |
| Dec | 2.52 | 4.46 | 1.79 | 1.37 | 17.7 | 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 2.46 kWh/m²/day, 0.77 system efficiency.
About solar in Nghi Sơn
Nghi Sơn, Vietnam has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 3.95 kWh/m²/day, a moderate solar resource by global standards.
The strongest month in Nghi Sơn is June (summer) at 5.5 kWh/m²/day, and the weakest is January (winter) at 2.46 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the January value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Given the moderate resource, Nghi Sơn installations typically oversize panels or combine solar with another source (grid, generator, hydro) for reliability.
FAQ
- What are the peak sun hours in Nghi Sơn?
- Nghi Sơn averages 3.95 peak sun hours per day annually, ranging from 2.46 in January to 5.5 in June.
- How many solar panels do I need in Nghi Sơn?
- Panel count depends on your daily load. At Nghi Sơn's annual average of 3.95 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 Nghi Sơn?
- Sizing against Nghi Sơn's worst month (January, 2.46 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 Nghi Sơn's solar resource compare globally?
- Nghi Sơn sits in solar zone 2 out of 5 (where 5 is strongest) at 3.95 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 Nghi Sơn?
- Nghi Sơn's dry-season output peaks at 5.5 kWh/m²/day in June; the wet season drops it to 2.46 in January. That ~77% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Nghi Sơn?
- 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 Nghi Sơn?
- Nghi Sơn swings from 5.5 kWh/m²/day in June (dry) to 2.46 in January (wet) — roughly 77%. Year-round off-grid systems must size against the wet-season minimum.