Phra Nakhon Si Ayutthaya · Thailand · 14.23° N · 100.58° E
Solar position in Bang Pa-in
Sun position, daylight and the best solar panel angle for Bang Pa-in — computed for 14.23° N, 100.58° E, 8 m above sea level.
The sun right now
Sun in Bang Pa-in today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:58 | sun 18° below horizon |
| Nautical dawn | 05:23 | 12° below |
| Civil dawn | 05:48 | 6° below |
| Sunrise | 06:10 | 102° ESE |
| Golden hour ends | 06:39 | sun 6° up |
| Solar noon | 12:01 | 63.7° high |
| Golden hour starts | 17:23 | sun 6° up |
| Sunset | 17:52 | 258° WSW |
| Civil dusk | 18:14 | 6° below |
| Nautical dusk | 18:39 | 12° below |
| Astronomical dusk | 19:04 | 18° below |
| Day length | 11 h 42 min | |
Sun path diagram for Bang Pa-in
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 80.8° at solar noon in Bang Pa-in; on the December solstice only 52.3°. 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 | 06:46 | 12:28 | 18:11 | 11 h 25 min | 55.9° |
| February | 06:38 | 12:31 | 18:24 | 11 h 45 min | 65.2° |
| March | 06:21 | 12:24 | 18:28 | 12 h 07 min | 76.0° |
| April | 06:00 | 12:16 | 18:32 | 12 h 31 min | 87.6° |
| May | 05:49 | 12:14 | 18:39 | 12 h 50 min | 84.0° |
| June | 05:50 | 12:19 | 18:48 | 12 h 58 min | 80.8° |
| July | 05:58 | 12:24 | 18:49 | 12 h 51 min | 83.8° |
| August | 06:04 | 12:20 | 18:36 | 12 h 32 min | 87.9° |
| September | 06:06 | 12:10 | 18:14 | 12 h 08 min | 76.5° |
| October | 06:09 | 12:02 | 17:54 | 11 h 45 min | 65.1° |
| November | 06:20 | 12:03 | 17:46 | 11 h 25 min | 55.9° |
| December | 06:36 | 12:15 | 17:54 | 11 h 17 min | 52.3° |
A year of daylight in Bang Pa-in
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 Bang Pa-in
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
15°collects the most energy over a year: 1540 kWh per kWp.
9°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° | 1495 | 97% | 3.95 | 1.2× |
| 9° off-grid best | 1532 | 99% | 3.90 | 1.2× |
| 14° = latitude | 1539 | 100% | 3.85 | 1.2× |
| 15° year-round best | 1540 | 100% | 3.83 | 1.2× |
| 30° | 1500 | 97% | 3.52 | 1.4× |
| 45° | 1380 | 90% | 3.04 | 1.7× |
| 60° | 1188 | 77% | 2.43 | 2.3× |
| 70° | 1030 | 67% | 1.96 | 2.8× |
| 90° | 715 | 46% | 1.21 | 3.1× |
A fixed array in Bang Pa-in produces the most over a year at 15°. The design month for an off-grid system is August: at 9° it makes 3.90 kWh per kWp a day, 2% more than at 15°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Bang Pa-in at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 15° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 15° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.95 | 5.21 | 4.26 | 4.49 | 25.9 °C |
| February | 5.36 | 4.59 | 3.71 | 4.57 | 28.6 °C |
| March | 5.62 | 3.77 | 3.01 | 4.53 | 30.2 °C |
| April | 6.03 | 2.91 | 2.30 | 4.61 | 31.1 °C |
| May | 5.61 | 2.20 | 1.73 | 4.16 | 29.7 °C |
| June | 5.38 | 2.00 | 1.57 | 3.95 | 28.5 °C |
| July | 5.16 | 2.08 | 1.65 | 3.83 | 27.8 °C |
| August | 5.01 | 2.46 | 1.96 | 3.83 | 27.6 °C |
| September | 4.88 | 2.99 | 2.41 | 3.88 | 27.1 °C |
| October | 4.78 | 3.67 | 2.98 | 3.99 | 26.7 °C |
| November | 4.88 | 4.77 | 3.90 | 4.34 | 25.6 °C |
| December | 4.82 | 5.38 | 4.42 | 4.47 | 24.7 °C |
| Year | 5.20 avg | 3.49 avg | 1030 kWh | 1540 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 750 Wp of panels at 70°, versus 310 Wp at 15°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Bang Pa-in
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.
2.3 mrow pitch at 70°
2.4 mrow pitch at 15°
How Bang Pa-in compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
49thof 295 places in Thailand for sunshine, shared: 5.20 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Thailand: 1,540 against 1,509 kWh per kWp.
+2 mindaylight on the longest day, compared with Bangkok: 12 h 58 min against 12 h 56 min.
15°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); Bang Pa-in ranks joint 49th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.57 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 17 min, −2 min compared with Bangkok.
Solar forecast for Bang Pa-in, 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 Bang Pa-in
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A free, live card for Bang Pa-in: 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.