Solarposition.org

Lao Cai · Vietnam · 22.32° N · 104.19° E

Solar position in Thị Trấn Phố Lu

Sun position, daylight and the best solar panel angle for Thị Trấn Phố Lu — computed for 22.32° N, 104.19° E, 77 m above sea level.

Sunrise today06:03103° ESE
Sunset today17:30257° WSW
Best panel angle18°year-round, facing south
Off-grid angle41°best for the darkest month

The sun right now

Azimuth180.0°
Elevation55.6°
At solar noon, 11:47Open on the sun map

Sun in Thị Trấn Phố Lu today

Sunday, 25 October 2026 · local time UTC+7

EventTimeDirection / height
Astronomical dawn04:48sun 18° below horizon
Nautical dawn05:1412° below
Civil dawn05:406° below
Sunrise06:03103° ESE
Golden hour ends06:34sun 6° up
Solar noon11:4755.6° high
Golden hour starts17:00sun 6° up
Sunset17:30257° WSW
Civil dusk17:536° below
Nautical dusk18:1912° below
Astronomical dusk18:4518° below
Day length11 h 27 min

Sun path diagram for Thị Trấn Phố Lu

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 88.9° at solar noon in Thị Trấn Phố Lu; on the December solstice only 44.3°. 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
January06:4412:1417:4410 h 59 min47.8°
February06:3012:1618:0311 h 32 min57.1°
March06:0612:1018:1412 h 08 min67.9°
April05:3812:0218:2512 h 47 min79.5°
May05:2111:5918:3813 h 17 min87.9°
June05:1912:0518:5013 h 30 min88.9°
July05:3012:0918:4813 h 18 min88.1°
August05:4212:0618:3012 h 48 min79.8°
September05:5111:5618:0012 h 09 min68.4°
October06:0111:4717:3311 h 32 min57.0°
November06:1911:4817:1810 h 59 min47.8°
December06:3812:0117:2410 h 46 min44.3°

A year of daylight in Thị Trấn Phố Lu

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 Thị Trấn Phố Lu

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

18°collects the most energy over a year: 1161 kWh per kWp.

41°gives the most in the darkest month — the one an off-grid system is sized for.

40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 18°Best worst-month 41°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearJanuary kWh/kWp/dayBest ÷ worst month
0°111796%2.021.9×
15°1160100%2.311.6×
18° year-round best1161100%2.361.6×
22° = latitude1159100%2.411.5×
30°114398%2.481.4×
41° off-grid best109494%2.521.3×
45°106892%2.521.3×
60°94081%2.411.4×
70°83172%2.271.6×
90°58751%1.832.0×

A fixed array in Thị Trấn Phố Lu produces the most over a year at 18°. The design month for an off-grid system is January: at 41° it makes 2.52 kWh per kWp a day, 7% more than at 18°, and costs 6% of the yearly total. Why steep panels win winter.

Off-grid solar in Thị Trấn Phố Lu at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 18° (year-round best).

01234January: 2.27 (70°)2.3JanFebruary: 2.55 (70°)2.5FebMarch: 2.32 (70°)2.3MarApril: 2.22 (70°)2.2AprMay: 1.97 (70°)2.0MayJune: 1.80 (70°)1.8JunJuly: 1.83 (70°)1.8JulAugust: 2.10 (70°)2.1AugSeptember: 2.45 (70°)2.4SepOctober: 2.39 (70°)2.4OctNovember: 2.95 (70°)3.0NovDecember: 2.50 (70°)2.5Dec18°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 18°Mean temp.
January2.472.662.272.3612.6 °C
February3.213.012.552.9415.4 °C
March3.662.792.323.1218.8 °C
April4.452.722.223.5822.3 °C
May4.872.441.973.7424.4 °C
June4.532.251.803.4225.3 °C
July4.502.281.833.4225.1 °C
August4.522.592.103.5424.8 °C
September4.292.992.453.5323.5 °C
October3.402.892.392.9620.6 °C
November3.233.492.953.0817.1 °C
December2.562.932.502.4913.0 °C
Year3.81 avg2.75 avg831 kWh1161 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 650 Wp of panels at 70°, versus 500 Wp at 18°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Thị Trấn Phố Lu

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 18°

Row spacing calculator

How Thị Trấn Phố Lu compares in Vietnam

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

209thof 307 places in Vietnam for sunshine, shared: 3.81 peak sun hours a day on flat ground.

−12%solar energy a year compared with the average place in Vietnam: 1,161 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.

18°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); Thị Trấn Phố Lu ranks joint 209th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.80 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 10 h 46 min, −43 min compared with Ho Chi Minh City.

The sunniest places in Vietnam

Solar forecast for Thị Trấn Phố Lu, 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 Thị Trấn Phố Lu

What is the best solar panel angle in Thị Trấn Phố Lu?
For a fixed array facing south, the best year-round tilt in Thị Trấn Phố Lu is 18°, worth about 1161 kWh per kWp a year. An off-grid system that has to get through January does better at about 41°.
What time is sunrise and sunset in Thị Trấn Phố Lu today?
On 25 October 2026 the sun rises at 06:03 and sets at 17:30 local time (UTC+7), giving 11 h 27 min of daylight. Solar noon is at 11:47.
How many peak sun hours does Thị Trấn Phố Lu get?
On a flat surface 3.8 hours a day averaged over the year, from 2.5 in January to 4.9 in May. Panels tilted at 70° receive 2.3 sun hours a day in June.
How high does the sun get in Thị Trấn Phố Lu?
At solar noon the sun stands 88.9° above the horizon on the June solstice and 44.3° on the December solstice.
Is Thị Trấn Phố Lu a good place for solar panels?
With 3.8 peak sun hours a day on flat ground, Thị Trấn Phố Lu ranks joint 209th of 307 places in Vietnam for sunshine. A 1 kWp array at the best angle (18°) makes about 1,161 kWh a year here, 12% less than the average place in Vietnam.

Places near Thị Trấn Phố Lu

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.