Solarposition.org

Wong Tai Sin District · Hong Kong · 22.33° N · 114.21° E

Solar position in Choi Wan Estate (I & II)

Sun position, daylight and the best solar panel angle for Choi Wan Estate (I & II) — computed for 22.33° N, 114.21° E, 66 m above sea level.

Sunrise today06:23103° ESE
Sunset today17:50257° WSW
Best panel angle19°year-round, facing south
Off-grid angle26°best for the darkest month

The sun right now

Azimuth180.0°
Elevation55.6°
At solar noon, 12:07Open on the sun map

Sun in Choi Wan Estate (I & II) today

Sunday, 25 October 2026 · local time UTC+8

EventTimeDirection / height
Astronomical dawn05:08sun 18° below horizon
Nautical dawn05:3412° below
Civil dawn06:006° below
Sunrise06:23103° ESE
Golden hour ends06:54sun 6° up
Solar noon12:0755.6° high
Golden hour starts17:20sun 6° up
Sunset17:50257° WSW
Civil dusk18:136° below
Nautical dusk18:3912° below
Astronomical dusk19:0518° below
Day length11 h 27 min

Sun path diagram for Choi Wan Estate (I & II)

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 solstice678910111213141516171819EquinoxDecember solstice891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 88.9° at solar noon in Choi Wan Estate (I & II); on the December solstice only 44.2°. Sunrise swings from 64° ENE in June to 115° ESE in December — a 51° 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
January07:0412:3418:0410 h 59 min47.8°
February06:5012:3618:2211 h 32 min57.1°
March06:2612:3018:3412 h 08 min67.9°
April05:5812:2118:4512 h 47 min79.5°
May05:4112:1918:5813 h 17 min87.8°
June05:3912:2419:0913 h 30 min88.9°
July05:5012:2919:0813 h 18 min88.1°
August06:0212:2618:5012 h 48 min79.8°
September06:1112:1618:2012 h 09 min68.4°
October06:2112:0717:5311 h 32 min57.0°
November06:3912:0817:3810 h 59 min47.8°
December06:5712:2117:4410 h 46 min44.2°

A year of daylight in Choi Wan Estate (I & II)

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 Choi Wan Estate (I & II)

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: 1256 kWh per kWp.

26°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 26°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearFebruary kWh/kWp/dayBest ÷ worst month
0°120396%2.531.8×
15°1254100%2.781.5×
19° year-round best1256100%2.821.4×
22° = latitude1254100%2.851.4×
26° off-grid best124899%2.871.4×
30°123799%2.881.4×
45°115592%2.831.4×
60°101381%2.631.6×
70°89271%2.421.9×
90°62450%1.842.5×

A fixed array in Choi Wan Estate (I & II) produces the most over a year at 19°. The design month for an off-grid system is February: at 26° it makes 2.87 kWh per kWp a day, 2% more than at 19°, and costs 1% of the yearly total. Why steep panels win winter.

Off-grid solar in Choi Wan Estate (I & II) at 70°

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

012345January: 2.87 (70°)2.9JanFebruary: 2.42 (70°)2.4FebMarch: 2.14 (70°)2.1MarApril: 2.00 (70°)2.0AprMay: 1.84 (70°)1.8MayJune: 1.69 (70°)1.7JunJuly: 1.87 (70°)1.9JulAugust: 2.19 (70°)2.2AugSeptember: 2.67 (70°)2.7SepOctober: 3.21 (70°)3.2OctNovember: 3.26 (70°)3.3NovDecember: 3.15 (70°)3.2Dec19°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 19°Mean temp.
January3.043.392.872.9316.5 °C
February3.142.892.422.8218.1 °C
March3.412.592.142.8820.3 °C
April4.012.462.003.2023.3 °C
May4.692.311.843.5626.3 °C
June4.832.151.693.5628.0 °C
July5.512.361.874.0728.6 °C
August5.142.742.193.9628.5 °C
September4.783.312.673.9027.7 °C
October4.403.923.213.8825.2 °C
November3.583.933.263.3921.9 °C
December3.123.743.153.0817.7 °C
Year4.14 avg2.98 avg892 kWh1256 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 420 Wp at 19°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Choi Wan Estate (I & II)

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.

2.8 mrow pitch at 70°

2.6 mrow pitch at 19°

Row spacing calculator

How Choi Wan Estate (I & II) compares in Hong Kong

Against the other 135 places in Hong Kong with climate data, for a fixed array at its best angle.

36thof 136 places in Hong Kong for sunshine, shared: 4.14 peak sun hours a day on flat ground.

±0%solar energy a year compared with the average place in Hong Kong: 1,256 against 1,255 kWh per kWp.

±0 mindaylight on the longest day, compared with Hong Kong: 13 h 30 min against 13 h 30 min.

19°best year-round tilt here; across Hong Kong it runs from 18° in Shek O to 20° in Fanling.

Of the 136 places in Hong Kong, Shek O and one other place get the most sun (4.16 peak sun hours a day) and Sheung Shui and one other place the least (4.11); Choi Wan Estate (I & II) ranks joint 36th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.69 kWh a day here, against 1.69 kWh on average in Hong Kong. The shortest day lasts 10 h 46 min, ±0 min compared with Hong Kong.

The sunniest places in Hong Kong

Solar forecast for Choi Wan Estate (I & II), 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 Choi Wan Estate (I & II)

What is the best solar panel angle in Choi Wan Estate (I & II)?
For a fixed array facing south, the best year-round tilt in Choi Wan Estate (I & II) is 19°, worth about 1256 kWh per kWp a year. An off-grid system that has to get through February does better at about 26°.
What time is sunrise and sunset in Choi Wan Estate (I & II) today?
On 25 October 2026 the sun rises at 06:23 and sets at 17:50 local time (UTC+8), giving 11 h 27 min of daylight. Solar noon is at 12:07.
How many peak sun hours does Choi Wan Estate (I & II) get?
On a flat surface 4.1 hours a day averaged over the year, from 3.0 in January to 5.5 in July. Panels tilted at 70° receive 2.1 sun hours a day in June.
How high does the sun get in Choi Wan Estate (I & II)?
At solar noon the sun stands 88.9° above the horizon on the June solstice and 44.2° on the December solstice.
Is Choi Wan Estate (I & II) a good place for solar panels?
With 4.1 peak sun hours a day on flat ground, Choi Wan Estate (I & II) ranks joint 36th of 136 places in Hong Kong for sunshine. A 1 kWp array at the best angle (19°) makes about 1,256 kWh a year here, as much as the average place in Hong Kong.

Places near Choi Wan Estate (I & II)

All places in Hong Kong

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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.