Trat · Thailand · 11.78° N · 102.89° E
Solar position in Khlong Yai
Sun position, daylight and the best solar panel angle for Khlong Yai — computed for 11.78° N, 102.89° E, 45 m above sea level.
The sun right now
Sun in Khlong Yai today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:47 | sun 18° below horizon |
| Nautical dawn | 05:12 | 12° below |
| Civil dawn | 05:37 | 6° below |
| Sunrise | 05:59 | 102° ESE |
| Golden hour ends | 06:27 | sun 6° up |
| Solar noon | 11:52 | 66.1° high |
| Golden hour starts | 17:17 | sun 6° up |
| Sunset | 17:45 | 258° WSW |
| Civil dusk | 18:07 | 6° below |
| Nautical dusk | 18:32 | 12° below |
| Astronomical dusk | 18:57 | 18° below |
| Day length | 11 h 46 min | |
Sun path diagram for Khlong Yai
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 78.3° at solar noon in Khlong Yai; on the December solstice only 54.8°. Sunrise swings from 66° ENE in June to 114° ESE in December — a 48° 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 | 06:33 | 12:19 | 18:06 | 11 h 33 min | 58.3° |
| February | 06:27 | 12:22 | 18:16 | 11 h 49 min | 67.7° |
| March | 06:12 | 12:15 | 18:19 | 12 h 07 min | 78.5° |
| April | 05:53 | 12:07 | 18:20 | 12 h 27 min | 89.9° |
| May | 05:43 | 12:05 | 18:26 | 12 h 42 min | 81.6° |
| June | 05:45 | 12:10 | 18:34 | 12 h 49 min | 78.3° |
| July | 05:53 | 12:14 | 18:36 | 12 h 43 min | 81.3° |
| August | 05:57 | 12:11 | 18:25 | 12 h 27 min | 89.7° |
| September | 05:57 | 12:01 | 18:05 | 12 h 08 min | 78.9° |
| October | 05:58 | 11:53 | 17:47 | 11 h 49 min | 67.5° |
| November | 06:07 | 11:54 | 17:40 | 11 h 33 min | 58.3° |
| December | 06:23 | 12:06 | 17:49 | 11 h 26 min | 54.8° |
A year of daylight in Khlong Yai
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 Khlong Yai
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
14°collects the most energy over a year: 1423 kWh per kWp.
0°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 | July kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° off-grid best | 1388 | 98% | 3.38 | 1.3× |
| 12° = latitude | 1422 | 100% | 3.22 | 1.4× |
| 14° year-round best | 1423 | 100% | 3.18 | 1.4× |
| 15° | 1423 | 100% | 3.16 | 1.4× |
| 30° | 1381 | 97% | 2.79 | 1.7× |
| 45° | 1265 | 89% | 2.29 | 2.1× |
| 60° | 1084 | 76% | 1.70 | 2.7× |
| 70° | 937 | 66% | 1.32 | 3.3× |
| 90° | 652 | 46% | 1.02 | 3.2× |
A fixed array in Khlong Yai produces the most over a year at 14°. The design month for an off-grid system is July: at 0° it makes 3.38 kWh per kWp a day, 6% more than at 14°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in Khlong Yai at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 14° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 14° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.99 | 4.98 | 4.08 | 4.45 | 25.5 °C |
| February | 5.28 | 4.31 | 3.52 | 4.49 | 26.4 °C |
| March | 5.42 | 3.48 | 2.81 | 4.39 | 27.4 °C |
| April | 5.52 | 2.59 | 2.07 | 4.25 | 28.2 °C |
| May | 4.93 | 1.90 | 1.50 | 3.68 | 28.0 °C |
| June | 4.49 | 1.64 | 1.28 | 3.31 | 27.2 °C |
| July | 4.28 | 1.68 | 1.32 | 3.18 | 26.8 °C |
| August | 4.23 | 1.99 | 1.58 | 3.23 | 26.7 °C |
| September | 4.23 | 2.50 | 2.01 | 3.34 | 26.5 °C |
| October | 4.63 | 3.41 | 2.77 | 3.83 | 26.6 °C |
| November | 4.87 | 4.52 | 3.69 | 4.25 | 26.4 °C |
| December | 4.90 | 5.18 | 4.24 | 4.43 | 25.6 °C |
| Year | 4.81 avg | 3.18 avg | 937 kWh | 1423 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 920 Wp of panels at 70°, versus 370 Wp at 14°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Khlong Yai
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.
2.2 mrow pitch at 70°
2.3 mrow pitch at 14°
How Khlong Yai compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
286thof 295 places in Thailand for sunshine, shared: 4.81 peak sun hours a day on flat ground.
−6%solar energy a year compared with the average place in Thailand: 1,423 against 1,509 kWh per kWp.
−7 mindaylight on the longest day, compared with Bangkok: 12 h 49 min against 12 h 56 min.
14°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); Khlong Yai ranks joint 286th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.28 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 26 min, +7 min compared with Bangkok.
Solar forecast for Khlong Yai, 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 Khlong Yai
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Places near Khlong Yai
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A free, live card for Khlong Yai: 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.