Solarposition.org

An Giang · Vietnam · 9.97° N · 104.85° E

Solar position in Kiên Hải

Sun position, daylight and the best solar panel angle for Kiên Hải — computed for 9.97° N, 104.85° E, 18 m above sea level.

Sunrise today05:49102° ESE
Sunset today17:39258° WSW
Best panel angle11°year-round, facing south
Off-grid angle1°best for the darkest month

The sun right now

Azimuth180.0°
Elevation67.9°
At solar noon, 11:44Open on the sun map

Sun in Kiên Hải today

Sunday, 25 October 2026 · local time UTC+7

EventTimeDirection / height
Astronomical dawn04:38sun 18° below horizon
Nautical dawn05:0312° below
Civil dawn05:286° below
Sunrise05:49102° ESE
Golden hour ends06:18sun 6° up
Solar noon11:4467.9° high
Golden hour starts17:10sun 6° up
Sunset17:39258° WSW
Civil dusk18:006° below
Nautical dusk18:2512° below
Astronomical dusk18:5018° below
Day length11 h 50 min

Sun path diagram for Kiên Hải

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 76.5° at solar noon in Kiên Hải; on the December solstice only 56.6°. 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January06:2212:1118:0011 h 38 min60.1°
February06:1812:1418:1011 h 52 min69.5°
March06:0412:0718:1112 h 07 min80.3°
April05:4711:5918:1112 h 24 min88.1°
May05:3811:5718:1512 h 37 min79.8°
June05:4112:0218:2312 h 42 min76.5°
July05:4812:0718:2512 h 37 min79.5°
August05:5112:0318:1512 h 24 min87.9°
September05:4911:5317:5712 h 08 min80.7°
October05:4911:4517:4111 h 52 min69.3°
November05:5711:4617:3511 h 38 min60.1°
December06:1211:5817:4411 h 33 min56.6°

A year of daylight in Kiên Hải

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 Kiên Hải

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

11°collects the most energy over a year: 1479 kWh per kWp.

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

20%30%40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 11°Best worst-month 1°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearJuly kWh/kWp/dayBest ÷ worst month
0°145999%3.641.3×
1° off-grid best146299%3.631.3×
10° = latitude1479100%3.481.4×
11° year-round best1479100%3.461.4×
15°1476100%3.371.4×
30°141496%2.941.6×
45°127786%2.362.0×
60°107573%1.712.6×
70°91762%1.293.2×
90°62943%1.042.8×

A fixed array in Kiên Hải produces the most over a year at 11°. The design month for an off-grid system is July: at 1° it makes 3.63 kWh per kWp a day, 5% more than at 11°, and costs 1% of the yearly total. Why steep panels win winter.

Off-grid solar in Kiên Hải at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 11° (year-round best).

0123456January: 3.91 (70°)3.9JanFebruary: 3.67 (70°)3.7FebMarch: 2.96 (70°)3.0MarApril: 2.02 (70°)2.0AprMay: 1.42 (70°)1.4MayJune: 1.24 (70°)1.2JunJuly: 1.29 (70°)1.3JulAugust: 1.60 (70°)1.6AugSeptember: 2.08 (70°)2.1SepOctober: 2.72 (70°)2.7OctNovember: 3.47 (70°)3.5NovDecember: 3.82 (70°)3.8Dec11°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 11°Mean temp.
January5.064.803.914.3526.5 °C
February5.714.523.674.7527.7 °C
March5.993.682.964.8029.2 °C
April5.962.562.024.5730.1 °C
May5.221.821.423.9129.3 °C
June4.801.591.243.5728.0 °C
July4.611.651.293.4627.5 °C
August4.672.021.603.5927.3 °C
September4.582.592.083.6227.2 °C
October4.713.362.723.8527.1 °C
November4.834.263.474.0926.9 °C
December4.774.683.824.1326.3 °C
Year5.07 avg3.12 avg917 kWh1479 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 950 Wp of panels at 70°, versus 340 Wp at 11°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Kiên Hải

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.

2.1 mrow pitch at 70°

2.2 mrow pitch at 11°

Row spacing calculator

How Kiên Hải compares in Vietnam

Against the other 306 places in Vietnam with climate data, for a fixed array at its best angle.

89thof 307 places in Vietnam for sunshine, shared: 5.07 peak sun hours a day on flat ground.

+12%solar energy a year compared with the average place in Vietnam: 1,479 against 1,320 kWh per kWp.

−3 mindaylight on the longest day, compared with Ho Chi Minh City: 12 h 42 min against 12 h 46 min.

11°best year-round tilt here; across Vietnam it runs from 9° in Vĩnh Châu to 21° in Dien Bien Phu.

Of the 307 places in Vietnam, Phú Quý gets the most sun (5.45 peak sun hours a day) and Thị Trấn Thất Khê and one other place the least (3.61); Kiên Hải ranks joint 89th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.24 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 11 h 33 min, +3 min compared with Ho Chi Minh City.

The sunniest places in Vietnam

Solar forecast for Kiên Hải, 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 Kiên Hải

What is the best solar panel angle in Kiên Hải?
For a fixed array facing south, the best year-round tilt in Kiên Hải is 11°, worth about 1479 kWh per kWp a year. An off-grid system that has to get through July does better at about 1°.
What time is sunrise and sunset in Kiên Hải today?
On 25 October 2026 the sun rises at 05:49 and sets at 17:39 local time (UTC+7), giving 11 h 50 min of daylight. Solar noon is at 11:44.
How many peak sun hours does Kiên Hải get?
On a flat surface 5.1 hours a day averaged over the year, from 4.6 in September to 6.0 in March. Panels tilted at 70° receive 1.6 sun hours a day in June.
How high does the sun get in Kiên Hải?
At solar noon the sun stands 76.5° above the horizon on the June solstice and 56.6° on the December solstice.
Is Kiên Hải a good place for solar panels?
With 5.1 peak sun hours a day on flat ground, Kiên Hải ranks joint 89th of 307 places in Vietnam for sunshine. A 1 kWp array at the best angle (11°) makes about 1,479 kWh a year here, 12% more than the average place in Vietnam.

Places near Kiên Hải

All places in Vietnam

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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.