Solarposition.org

Lai Châu Province · Vietnam · 22.40° N · 103.46° E

Solar position in Lai Châu

Sun position, daylight and the best solar panel angle for Lai Châu — computed for 22.40° N, 103.46° E, 919 m above sea level.

Sunrise today06:06103° ESE
Sunset today17:33257° WSW
Best panel angle21°year-round, facing south
Off-grid angle29°best for the darkest month

The sun right now

Azimuth180.0°
Elevation55.5°
At solar noon, 11:50Open on the sun map

Sun in Lai Châu today

Sunday, 25 October 2026 · local time UTC+7

EventTimeDirection / height
Astronomical dawn04:51sun 18° below horizon
Nautical dawn05:1712° below
Civil dawn05:436° below
Sunrise06:06103° ESE
Golden hour ends06:37sun 6° up
Solar noon11:5055.5° high
Golden hour starts17:03sun 6° up
Sunset17:33257° WSW
Civil dusk17:566° below
Nautical dusk18:2212° below
Astronomical dusk18:4818° below
Day length11 h 27 min

Sun path diagram for Lai Châu

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 89.0° at solar noon in Lai Châu; 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
January06:4712:1717:4710 h 59 min47.7°
February06:3312:1918:0511 h 32 min57.1°
March06:0912:1318:1712 h 08 min67.8°
April05:4112:0418:2812 h 47 min79.5°
May05:2412:0218:4113 h 18 min87.8°
June05:2212:0718:5313 h 30 min89.0°
July05:3312:1218:5113 h 19 min88.1°
August05:4512:0918:3312 h 48 min79.7°
September05:5411:5918:0312 h 09 min68.3°
October06:0411:5017:3611 h 32 min56.9°
November06:2211:5117:2110 h 59 min47.7°
December06:4112:0417:2710 h 46 min44.2°

A year of daylight in Lai Châu

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 Lai Châu

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

21°collects the most energy over a year: 1244 kWh per kWp.

29°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 21°Best worst-month 29°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°118395%2.331.7×
15°1239100%2.771.5×
21° year-round best1244100%2.901.4×
22° = latitude1244100%2.911.4×
29° off-grid best123499%3.031.3×
30°123199%3.041.3×
45°115993%3.141.4×
60°102883%3.061.7×
70°91373%2.911.9×
90°65152%2.392.3×

A fixed array in Lai Châu produces the most over a year at 21°. The design month for an off-grid system is December: at 29° it makes 3.03 kWh per kWp a day, 5% more than at 21°, and costs 1% of the yearly total. Why steep panels win winter.

Off-grid solar in Lai Châu at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 21° (year-round best).

012345January: 2.84 (70°)2.8JanFebruary: 3.17 (70°)3.2FebMarch: 2.76 (70°)2.8MarApril: 2.44 (70°)2.4AprMay: 2.01 (70°)2.0MayJune: 1.75 (70°)1.8JunJuly: 1.78 (70°)1.8JulAugust: 2.09 (70°)2.1AugSeptember: 2.48 (70°)2.5SepOctober: 2.54 (70°)2.5OctNovember: 3.31 (70°)3.3NovDecember: 2.91 (70°)2.9Dec21°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 21°Mean temp.
January2.903.312.842.9112.3 °C
February3.803.723.173.6115.1 °C
March4.283.302.763.7018.5 °C
April4.952.972.443.9721.8 °C
May5.012.482.013.8123.5 °C
June4.282.181.753.2024.1 °C
July4.282.211.783.2223.7 °C
August4.462.582.093.4723.5 °C
September4.333.022.483.5622.3 °C
October3.563.052.543.1419.7 °C
November3.503.903.313.4516.3 °C
December2.853.392.912.9012.5 °C
Year4.02 avg3.00 avg913 kWh1244 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 670 Wp of panels at 70°, versus 410 Wp at 21°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Lai Châu

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°

2.7 mrow pitch at 21°

Row spacing calculator

How Lai Châu compares in Vietnam

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

175thof 307 places in Vietnam for sunshine, shared: 4.02 peak sun hours a day on flat ground.

−6%solar energy a year compared with the average place in Vietnam: 1,244 against 1,320 kWh per kWp.

+45 mindaylight on the longest day, compared with Ho Chi Minh City: 13 h 30 min against 12 h 46 min.

21°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); Lai Châu ranks joint 175th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.75 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 10 h 46 min, −44 min compared with Ho Chi Minh City.

The sunniest places in Vietnam

Solar forecast for Lai Châu, 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 Lai Châu

What is the best solar panel angle in Lai Châu?
For a fixed array facing south, the best year-round tilt in Lai Châu is 21°, worth about 1244 kWh per kWp a year. An off-grid system that has to get through December does better at about 29°.
What time is sunrise and sunset in Lai Châu today?
On 25 October 2026 the sun rises at 06:06 and sets at 17:33 local time (UTC+7), giving 11 h 27 min of daylight. Solar noon is at 11:50.
How many peak sun hours does Lai Châu get?
On a flat surface 4.0 hours a day averaged over the year, from 2.8 in December to 5.0 in May. Panels tilted at 70° receive 2.2 sun hours a day in June.
How high does the sun get in Lai Châu?
At solar noon the sun stands 89.0° above the horizon on the June solstice and 44.2° on the December solstice.
Is Lai Châu a good place for solar panels?
With 4.0 peak sun hours a day on flat ground, Lai Châu ranks joint 175th of 307 places in Vietnam for sunshine. A 1 kWp array at the best angle (21°) makes about 1,244 kWh a year here, 6% less than the average place in Vietnam.

Places near Lai Châu

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.