Udon Thani · Thailand · 17.43° N · 102.57° E
Solar position in Kut Chap
Sun position, daylight and the best solar panel angle for Kut Chap — computed for 17.43° N, 102.57° E, 197 m above sea level.
The sun right now
Sun in Kut Chap today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:52 | sun 18° below horizon |
| Nautical dawn | 05:17 | 12° below |
| Civil dawn | 05:43 | 6° below |
| Sunrise | 06:05 | 102° ESE |
| Golden hour ends | 06:35 | sun 6° up |
| Solar noon | 11:53 | 60.5° high |
| Golden hour starts | 17:12 | sun 6° up |
| Sunset | 17:41 | 257° WSW |
| Civil dusk | 18:03 | 6° below |
| Nautical dusk | 18:29 | 12° below |
| Astronomical dusk | 18:54 | 18° below |
| Day length | 11 h 36 min | |
Sun path diagram for Kut Chap
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 84.0° at solar noon in Kut Chap; on the December solstice only 49.2°. Sunrise swings from 65° ENE in June to 114° ESE in December — a 49° arc along the horizon.
Sunrise, sunset and sun height by month
Values for the 21st of each month, local clock time including daylight saving time.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 06:43 | 12:21 | 17:58 | 11 h 15 min | 52.7° |
| February | 06:33 | 12:23 | 18:13 | 11 h 40 min | 62.0° |
| March | 06:13 | 12:17 | 18:20 | 12 h 07 min | 72.8° |
| April | 05:49 | 12:08 | 18:27 | 12 h 37 min | 84.4° |
| May | 05:36 | 12:06 | 18:36 | 13 h 01 min | 87.2° |
| June | 05:36 | 12:11 | 18:46 | 13 h 10 min | 84.0° |
| July | 05:45 | 12:16 | 18:46 | 13 h 01 min | 87.0° |
| August | 05:53 | 12:12 | 18:31 | 12 h 38 min | 84.7° |
| September | 05:58 | 12:02 | 18:07 | 12 h 09 min | 73.3° |
| October | 06:04 | 11:54 | 17:44 | 11 h 40 min | 61.9° |
| November | 06:17 | 11:55 | 17:33 | 11 h 15 min | 52.7° |
| December | 06:34 | 12:07 | 17:40 | 11 h 05 min | 49.2° |
A year of daylight in Kut Chap
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Kut Chap
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
20°collects the most energy over a year: 1517 kWh per kWp.
1°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | August kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1446 | 95% | 3.65 | 1.2× |
| 1° off-grid best | 1454 | 96% | 3.65 | 1.2× |
| 15° | 1513 | 100% | 3.57 | 1.3× |
| 17° = latitude | 1516 | 100% | 3.55 | 1.3× |
| 20° year-round best | 1517 | 100% | 3.51 | 1.3× |
| 30° | 1498 | 99% | 3.32 | 1.5× |
| 45° | 1402 | 92% | 2.91 | 1.8× |
| 60° | 1231 | 81% | 2.36 | 2.3× |
| 70° | 1084 | 71% | 1.95 | 2.7× |
| 90° | 766 | 50% | 1.15 | 3.2× |
A fixed array in Kut Chap produces the most over a year at 20°. The design month for an off-grid system is August: at 1° it makes 3.65 kWh per kWp a day, 4% more than at 20°, and costs 4% of the yearly total. Why steep panels win winter.
Off-grid solar in Kut Chap at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 20° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 20° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.79 | 5.43 | 4.51 | 4.66 | 22.1 °C |
| February | 5.20 | 4.75 | 3.89 | 4.65 | 25.5 °C |
| March | 5.20 | 3.70 | 2.98 | 4.25 | 28.8 °C |
| April | 5.71 | 3.06 | 2.43 | 4.34 | 30.9 °C |
| May | 5.49 | 2.37 | 1.88 | 4.01 | 29.3 °C |
| June | 5.14 | 2.14 | 1.70 | 3.72 | 27.6 °C |
| July | 4.84 | 2.16 | 1.71 | 3.55 | 27.0 °C |
| August | 4.61 | 2.43 | 1.95 | 3.51 | 26.5 °C |
| September | 4.69 | 3.02 | 2.44 | 3.75 | 26.3 °C |
| October | 4.90 | 4.00 | 3.28 | 4.23 | 24.9 °C |
| November | 4.89 | 5.18 | 4.29 | 4.63 | 23.1 °C |
| December | 4.65 | 5.57 | 4.64 | 4.63 | 21.1 °C |
| Year | 5.01 avg | 3.64 avg | 1084 kWh | 1517 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 700 Wp of panels at 70°, versus 340 Wp at 20°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Kut Chap
Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.
2.5 mrow pitch at 70°
2.5 mrow pitch at 20°
How Kut Chap compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
205thof 295 places in Thailand for sunshine, shared: 5.01 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Thailand: 1,518 against 1,509 kWh per kWp.
+14 mindaylight on the longest day, compared with Bangkok: 13 h 10 min against 12 h 56 min.
20°best year-round tilt here; across Thailand it runs from 4° in Narathiwat to 23° in Mae Chan.
Of the 295 places in Thailand, Bangkok and 7 other places get the most sun (5.23 peak sun hours a day) and Mae Ramat the least (4.74); Kut Chap ranks joint 205th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.70 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 05 min, −14 min compared with Bangkok.
Solar forecast for Kut Chap, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Kut Chap
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A free, live card for Kut Chap: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.