Peak Sun Hours in Changwon, Gyeongsangnam-do, South Korea
- Solar zone
- Zone 3 (good)
- Best month
- May (5.6)
- Worst month
- December (2.5)
- Climate
- Temperate · 14.0°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 2.71 | 3.22 | 3.38 | 1.22 | 2.2 | 76 |
| Feb | 3.40 | 4.19 | 3.51 | 1.54 | 4.3 | 72 |
| Mar | 4.40 | 5.49 | 3.76 | 2.00 | 7.9 | 72 |
| Apr | 5.09 | 6.66 | 3.88 | 2.29 | 12.5 | 75 |
| May | 5.59 | 7.40 | 3.80 | 2.63 | 16.9 | 79 |
| Jun | 5.07 | 7.39 | 2.68 | 2.79 | 20.7 | 83 |
| Jul | 4.44 | 7.20 | 2.26 | 2.55 | 24.2 | 89 |
| Aug | 4.59 | 6.74 | 2.94 | 2.36 | 25.8 | 85 |
| Sep | 3.94 | 5.79 | 2.79 | 2.05 | 22.0 | 82 |
| Oct | 3.68 | 4.61 | 3.68 | 1.62 | 16.8 | 76 |
| Nov | 2.80 | 3.45 | 3.37 | 1.25 | 10.6 | 75 |
| Dec | 2.49 | 2.93 | 3.42 | 1.08 | 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 2.49 kWh/m²/day, 0.77 system efficiency.
About solar in Changwon
Changwon, South Korea has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 4.02 kWh/m²/day, a good solar resource by global standards.
The strongest month in Changwon is May (spring) at 5.59 kWh/m²/day, and the weakest is December (winter) at 2.49 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.
Changwon'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 Changwon?
- Changwon averages 4.02 peak sun hours per day annually, ranging from 2.49 in December to 5.59 in May.
- How many solar panels do I need in Changwon?
- Panel count depends on your daily load. At Changwon's annual average of 4.02 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 Changwon?
- Sizing against Changwon's worst month (December, 2.49 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 Changwon's solar resource compare globally?
- Changwon sits in solar zone 3 out of 5 (where 5 is strongest) at 4.02 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 Changwon?
- Changwon's worst month (December) delivers 2.49 kWh/m²/day — about 45% of the summer peak of 5.59. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Changwon's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Changwon's 4.02 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Changwon?
- At Changwon's latitude (35°), a fixed tilt near 35° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.