Peak Sun Hours in Geoje, Gyeongsangnam-do, South Korea
- Solar zone
- Zone 3 (good)
- Best month
- May (5.5)
- Worst month
- December (2.4)
- Climate
- Temperate · 14.0°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 2.60 | 3.28 | 3.09 | 1.22 | 2.2 | 76 |
| Feb | 3.31 | 4.23 | 3.36 | 1.50 | 4.3 | 72 |
| Mar | 4.33 | 5.50 | 3.70 | 1.92 | 7.9 | 72 |
| Apr | 5.07 | 6.63 | 3.88 | 2.23 | 12.5 | 75 |
| May | 5.49 | 7.33 | 3.78 | 2.51 | 16.9 | 79 |
| Jun | 4.96 | 7.29 | 2.65 | 2.67 | 20.7 | 83 |
| Jul | 4.83 | 7.11 | 2.86 | 2.47 | 24.2 | 89 |
| Aug | 4.97 | 6.66 | 3.54 | 2.28 | 25.8 | 85 |
| Sep | 4.14 | 5.75 | 3.17 | 1.94 | 22.0 | 82 |
| Oct | 3.78 | 4.64 | 3.86 | 1.56 | 16.8 | 76 |
| Nov | 2.81 | 3.50 | 3.27 | 1.26 | 10.6 | 75 |
| Dec | 2.41 | 3.00 | 3.12 | 1.11 | 4.3 | 77 |
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 2.41 kWh/m²/day, 0.77 system efficiency.
About solar in Geoje
Geoje, South Korea has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 4.06 kWh/m²/day, a good solar resource by global standards.
The strongest month in Geoje is May (spring) at 5.49 kWh/m²/day, and the weakest is December (winter) at 2.41 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.
Geoje'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 Geoje?
- Geoje averages 4.06 peak sun hours per day annually, ranging from 2.41 in December to 5.49 in May.
- How many solar panels do I need in Geoje?
- Panel count depends on your daily load. At Geoje's annual average of 4.06 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 Geoje?
- Sizing against Geoje's worst month (December, 2.41 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 Geoje's solar resource compare globally?
- Geoje sits in solar zone 3 out of 5 (where 5 is strongest) at 4.06 kWh/m²/day — good by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- How much does winter reduce solar output in Geoje?
- Geoje's worst month (December) delivers 2.41 kWh/m²/day — about 44% of the summer peak of 5.49. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Geoje's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Geoje's 4.06 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Geoje?
- At Geoje's latitude (35°), a fixed tilt near 35° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.