Ratchaburi · Thailand · 13.71° N · 99.90° E
Solar position in Ban I Chang
Sun position, daylight and the best solar panel angle for Ban I Chang — computed for 13.71° N, 99.90° E, 12 m above sea level.
The sun right now
Sun in Ban I Chang today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:01 | sun 18° below horizon |
| Nautical dawn | 05:26 | 12° below |
| Civil dawn | 05:51 | 6° below |
| Sunrise | 06:12 | 102° ESE |
| Golden hour ends | 06:41 | sun 6° up |
| Solar noon | 12:04 | 64.2° high |
| Golden hour starts | 17:27 | sun 6° up |
| Sunset | 17:55 | 258° WSW |
| Civil dusk | 18:17 | 6° below |
| Nautical dusk | 18:42 | 12° below |
| Astronomical dusk | 19:07 | 18° below |
| Day length | 11 h 43 min | |
Sun path diagram for Ban I Chang
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 80.3° at solar noon in Ban I Chang; on the December solstice only 52.9°. 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 | 06:48 | 12:31 | 18:15 | 11 h 27 min | 56.4° |
| February | 06:41 | 12:34 | 18:27 | 11 h 46 min | 65.7° |
| March | 06:24 | 12:27 | 18:31 | 12 h 07 min | 76.5° |
| April | 06:04 | 12:19 | 18:34 | 12 h 30 min | 88.2° |
| May | 05:52 | 12:16 | 18:41 | 12 h 49 min | 83.5° |
| June | 05:54 | 12:22 | 18:50 | 12 h 56 min | 80.3° |
| July | 06:02 | 12:26 | 18:51 | 12 h 49 min | 83.3° |
| August | 06:08 | 12:23 | 18:38 | 12 h 31 min | 88.4° |
| September | 06:09 | 12:13 | 18:17 | 12 h 08 min | 77.0° |
| October | 06:12 | 12:04 | 17:57 | 11 h 46 min | 65.6° |
| November | 06:22 | 12:06 | 17:49 | 11 h 27 min | 56.4° |
| December | 06:38 | 12:18 | 17:57 | 11 h 19 min | 52.9° |
A year of daylight in Ban I Chang
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 Ban I Chang
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: 1497 kWh per kWp.
7°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° | 1458 | 97% | 3.82 | 1.3× |
| 7° off-grid best | 1487 | 99% | 3.74 | 1.3× |
| 14° = latitude | 1497 | 100% | 3.63 | 1.3× |
| 15° year-round best | 1497 | 100% | 3.61 | 1.3× |
| 30° | 1456 | 97% | 3.21 | 1.5× |
| 45° | 1338 | 89% | 2.67 | 1.8× |
| 60° | 1151 | 77% | 2.01 | 2.3× |
| 70° | 996 | 67% | 1.57 | 2.7× |
| 90° | 692 | 46% | 1.17 | 2.9× |
A fixed array in Ban I Chang produces the most over a year at 15°. The design month for an off-grid system is July: at 7° it makes 3.74 kWh per kWp a day, 4% more than at 15°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Ban I Chang 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 | 4.88 | 5.02 | 4.13 | 4.41 | 24.6 °C |
| February | 5.37 | 4.54 | 3.70 | 4.60 | 26.9 °C |
| March | 5.60 | 3.72 | 3.00 | 4.54 | 28.6 °C |
| April | 6.00 | 2.87 | 2.28 | 4.60 | 29.7 °C |
| May | 5.41 | 2.16 | 1.70 | 4.04 | 28.4 °C |
| June | 5.07 | 1.94 | 1.53 | 3.74 | 27.3 °C |
| July | 4.83 | 1.99 | 1.57 | 3.61 | 26.7 °C |
| August | 4.74 | 2.34 | 1.87 | 3.63 | 26.5 °C |
| September | 4.80 | 2.93 | 2.37 | 3.83 | 26.2 °C |
| October | 4.55 | 3.45 | 2.81 | 3.79 | 25.7 °C |
| November | 4.69 | 4.45 | 3.65 | 4.15 | 24.8 °C |
| December | 4.71 | 5.09 | 4.20 | 4.33 | 23.6 °C |
| Year | 5.05 avg | 3.37 avg | 996 kWh | 1497 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 770 Wp of panels at 70°, versus 330 Wp at 15°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Ban I Chang
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 Ban I Chang compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
174thof 295 places in Thailand for sunshine, shared: 5.05 peak sun hours a day on flat ground.
−1%solar energy a year compared with the average place in Thailand: 1,498 against 1,509 kWh per kWp.
±0 mindaylight on the longest day, compared with Bangkok: 12 h 56 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); Ban I Chang ranks joint 174th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.53 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 19 min, ±0 min compared with Bangkok.
Solar forecast for Ban I Chang, 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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A free, live card for Ban I Chang: 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.