Solarposition.org

Điện Biên Province · Vietnam · 22.00° N · 103.13° E

Solar position in Mường Lay

Sun position, daylight and the best solar panel angle for Mường Lay — computed for 22.00° N, 103.13° E, 496 m above sea level.

Sunrise today06:07103° ESE
Sunset today17:35257° WSW
Best panel angle21°year-round, facing south
Off-grid angle24°best for the darkest month

The sun right now

Azimuth180.0°
Elevation55.9°
At solar noon, 11:51Open on the sun map

Sun in Mường Lay today

Sunday, 25 October 2026 · local time UTC+7

EventTimeDirection / height
Astronomical dawn04:52sun 18° below horizon
Nautical dawn05:1812° below
Civil dawn05:446° below
Sunrise06:07103° ESE
Golden hour ends06:38sun 6° up
Solar noon11:5155.9° high
Golden hour starts17:04sun 6° up
Sunset17:35257° WSW
Civil dusk17:576° below
Nautical dusk18:2412° below
Astronomical dusk18:5018° below
Day length11 h 28 min

Sun path diagram for Mường Lay

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 88.6° at solar noon in Mường Lay; on the December solstice only 44.6°. 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
January06:4812:1817:4911 h 01 min48.1°
February06:3412:2118:0711 h 33 min57.5°
March06:1012:1418:1812 h 08 min68.2°
April05:4312:0618:2912 h 46 min79.9°
May05:2612:0418:4213 h 16 min88.2°
June05:2412:0918:5313 h 29 min88.6°
July05:3512:1318:5213 h 17 min88.5°
August05:4712:1018:3412 h 47 min80.1°
September05:5512:0018:0512 h 09 min68.7°
October06:0511:5217:3811 h 32 min57.3°
November06:2211:5317:2311 h 00 min48.1°
December06:4112:0517:2910 h 47 min44.6°

A year of daylight in Mường Lay

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 Mường Lay

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: 1296 kWh per kWp.

24°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 24°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°122995%2.501.7×
15°1290100%2.971.4×
21° year-round best1296100%3.111.3×
22° = latitude1296100%3.131.3×
24° off-grid best1295100%3.171.3×
30°128499%3.271.3×
45°121093%3.381.5×
60°107583%3.291.7×
70°95674%3.131.9×
90°68153%2.572.3×

A fixed array in Mường Lay produces the most over a year at 21°. The design month for an off-grid system is December: at 24° it makes 3.17 kWh per kWp a day, 2% more than at 21°, and costs 0% of the yearly total. Why steep panels win winter.

Off-grid solar in Mường Lay at 70°

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

012345January: 3.12 (70°)3.1JanFebruary: 3.43 (70°)3.4FebMarch: 2.92 (70°)2.9MarApril: 2.51 (70°)2.5AprMay: 2.06 (70°)2.1MayJune: 1.78 (70°)1.8JunJuly: 1.78 (70°)1.8JulAugust: 2.10 (70°)2.1AugSeptember: 2.52 (70°)2.5SepOctober: 2.70 (70°)2.7OctNovember: 3.44 (70°)3.4NovDecember: 3.13 (70°)3.1Dec21°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 21°Mean temp.
January3.173.643.123.1913.4 °C
February4.114.053.433.9116.2 °C
March4.553.502.923.9319.7 °C
April5.143.062.514.1122.7 °C
May5.142.542.063.8924.3 °C
June4.362.221.783.2524.5 °C
July4.282.211.783.2224.0 °C
August4.472.582.103.4723.7 °C
September4.433.072.523.6422.7 °C
October3.793.242.703.3420.3 °C
November3.664.063.443.6117.1 °C
December3.053.653.133.1113.5 °C
Year4.18 avg3.15 avg956 kWh1296 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 660 Wp of panels at 70°, versus 380 Wp at 21°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Mường Lay

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 Mường Lay compares in Vietnam

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

165thof 307 places in Vietnam for sunshine, shared: 4.18 peak sun hours a day on flat ground.

−2%solar energy a year compared with the average place in Vietnam: 1,296 against 1,320 kWh per kWp.

+43 mindaylight on the longest day, compared with Ho Chi Minh City: 13 h 29 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); Mường Lay ranks joint 165th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.78 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 10 h 47 min, −42 min compared with Ho Chi Minh City.

The sunniest places in Vietnam

Solar forecast for Mường Lay, 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 Mường Lay

What is the best solar panel angle in Mường Lay?
For a fixed array facing south, the best year-round tilt in Mường Lay is 21°, worth about 1296 kWh per kWp a year. An off-grid system that has to get through December does better at about 24°.
What time is sunrise and sunset in Mường Lay today?
On 25 October 2026 the sun rises at 06:07 and sets at 17:35 local time (UTC+7), giving 11 h 28 min of daylight. Solar noon is at 11:51.
How many peak sun hours does Mường Lay get?
On a flat surface 4.2 hours a day averaged over the year, from 3.1 in December to 5.1 in April. Panels tilted at 70° receive 2.2 sun hours a day in June.
How high does the sun get in Mường Lay?
At solar noon the sun stands 88.6° above the horizon on the June solstice and 44.6° on the December solstice.
Is Mường Lay a good place for solar panels?
With 4.2 peak sun hours a day on flat ground, Mường Lay ranks joint 165th of 307 places in Vietnam for sunshine. A 1 kWp array at the best angle (21°) makes about 1,296 kWh a year here, 2% less than the average place in Vietnam.

Places near Mường Lay

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.