Solarposition.org

Sukhothai · Thailand · 17.52° N · 99.76° E

Solar position in Si Satchanalai

Sun position, daylight and the best solar panel angle for Si Satchanalai — computed for 17.52° N, 99.76° E, 77 m above sea level.

Sunrise today06:16102° ESE
Sunset today17:52257° WSW
Best panel angle19°year-round, facing south
Off-grid angle1°best for the darkest month

The sun right now

Azimuth180.0°
Elevation60.4°
At solar noon, 12:04Open on the sun map

Sun in Si Satchanalai today

Sunday, 25 October 2026 · local time UTC+7

EventTimeDirection / height
Astronomical dawn05:03sun 18° below horizon
Nautical dawn05:2912° below
Civil dawn05:546° below
Sunrise06:16102° ESE
Golden hour ends06:46sun 6° up
Solar noon12:0460.4° high
Golden hour starts17:23sun 6° up
Sunset17:52257° WSW
Civil dusk18:156° below
Nautical dusk18:4012° below
Astronomical dusk19:0618° below
Day length11 h 36 min

Sun path diagram for Si Satchanalai

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice6789101112131415161718EquinoxDecember solstice7891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 84.1° at solar noon in Si Satchanalai; on the December solstice only 49.1°. 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January06:5412:3218:0911 h 15 min52.6°
February06:4412:3418:2411 h 40 min61.9°
March06:2412:2818:3212 h 07 min72.7°
April06:0112:1918:3812 h 37 min84.4°
May05:4712:1718:4813 h 01 min87.3°
June05:4712:2218:5813 h 11 min84.1°
July05:5612:2718:5813 h 02 min87.1°
August06:0512:2418:4312 h 38 min84.6°
September06:0912:1418:1812 h 09 min73.2°
October06:1512:0517:5511 h 40 min61.8°
November06:2912:0617:4411 h 15 min52.6°
December06:4612:1817:5111 h 05 min49.1°

A year of daylight in Si Satchanalai

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Si Satchanalai

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

19°collects the most energy over a year: 1520 kWh per kWp.

1°gives the most in the darkest month — the one an off-grid system is sized for.

30%40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 19°Best worst-month 1°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearAugust kWh/kWp/dayBest ÷ worst month
0°145296%3.621.3×
1° off-grid best145996%3.621.3×
15°1517100%3.541.3×
18° = latitude1520100%3.511.3×
19° year-round best1520100%3.491.3×
30°149999%3.291.5×
45°140092%2.891.8×
60°122781%2.352.2×
70°107871%1.942.7×
90°75850%1.163.1×

A fixed array in Si Satchanalai produces the most over a year at 19°. The design month for an off-grid system is August: at 1° it makes 3.62 kWh per kWp a day, 4% more than at 19°, and costs 4% of the yearly total. Why steep panels win winter.

Off-grid solar in Si Satchanalai at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 19° (year-round best).

012345January: 4.35 (70°)4.3JanFebruary: 3.95 (70°)4.0FebMarch: 3.17 (70°)3.2MarApril: 2.54 (70°)2.5AprMay: 1.89 (70°)1.9MayJune: 1.69 (70°)1.7JunJuly: 1.73 (70°)1.7JulAugust: 1.94 (70°)1.9AugSeptember: 2.46 (70°)2.5SepOctober: 3.13 (70°)3.1OctNovember: 4.18 (70°)4.2NovDecember: 4.48 (70°)4.5Dec19°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 19°Mean temp.
January4.685.264.354.4923.0 °C
February5.284.843.954.7026.1 °C
March5.523.943.174.5329.0 °C
April6.073.192.544.6431.0 °C
May5.662.391.894.1628.8 °C
June5.122.131.693.7327.2 °C
July4.782.171.733.5426.5 °C
August4.572.421.943.4926.1 °C
September4.693.032.463.7626.1 °C
October4.703.823.134.0325.5 °C
November4.795.074.184.5023.8 °C
December4.535.404.484.4622.0 °C
Year5.03 avg3.63 avg1078 kWh1520 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 19°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Si Satchanalai

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 19°

Row spacing calculator

How Si Satchanalai compares in Thailand

Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.

188thof 295 places in Thailand for sunshine, shared: 5.03 peak sun hours a day on flat ground.

+1%solar energy a year compared with the average place in Thailand: 1,520 against 1,509 kWh per kWp.

+14 mindaylight on the longest day, compared with Bangkok: 13 h 11 min against 12 h 56 min.

19°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); Si Satchanalai ranks joint 188th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.69 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.

The sunniest places in Thailand

Solar forecast for Si Satchanalai, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Si Satchanalai

What is the best solar panel angle in Si Satchanalai?
For a fixed array facing south, the best year-round tilt in Si Satchanalai is 19°, worth about 1520 kWh per kWp a year. An off-grid system that has to get through August does better at about 1°.
What time is sunrise and sunset in Si Satchanalai today?
On 25 October 2026 the sun rises at 06:16 and sets at 17:52 local time (UTC+7), giving 11 h 36 min of daylight. Solar noon is at 12:04.
How many peak sun hours does Si Satchanalai get?
On a flat surface 5.0 hours a day averaged over the year, from 4.5 in December to 6.1 in April. Panels tilted at 70° receive 2.1 sun hours a day in June.
How high does the sun get in Si Satchanalai?
At solar noon the sun stands 84.1° above the horizon on the June solstice and 49.1° on the December solstice.
Is Si Satchanalai a good place for solar panels?
With 5.0 peak sun hours a day on flat ground, Si Satchanalai ranks joint 188th of 295 places in Thailand for sunshine. A 1 kWp array at the best angle (19°) makes about 1,520 kWh a year here, 1% more than the average place in Thailand.

Places near Si Satchanalai

All places in Thailand

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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.