Solarposition.org

Rio de Janeiro · Brazil · 22.47° S · 43.83° W

Solar position in Barra do Piraí

Sun position, daylight and the best solar panel angle for Barra do Piraí — computed for 22.47° S, 43.83° W, 366 m above sea level.

Sunrise today05:16103° ESE
Sunset today18:03257° WSW
Best panel angle23°year-round, facing north
Off-grid angle25°best for the darkest month

The sun right now

Azimuth180.0°
Elevation79.4°
At solar noon, 11:39Open on the sun map

Sun in Barra do Piraí today

Saturday, 24 October 2026 · local time UTC−3

EventTimeDirection / height
Astronomical dawn03:58sun 18° below horizon
Nautical dawn04:2512° below
Civil dawn04:526° below
Sunrise05:16103° ESE
Golden hour ends05:46sun 6° up
Solar noon11:3979.4° high
Golden hour starts17:33sun 6° up
Sunset18:03257° WSW
Civil dusk18:266° below
Nautical dusk18:5312° below
Astronomical dusk19:2118° below
Day length12 h 47 min

Sun path diagram for Barra do Piraí

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 solstice7891011121314151617EquinoxDecember solstice6789101112131415161718Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 44.1° at solar noon in Barra do Piraí; on the December solstice only 89.0°. Sunrise swings from 65° ENE in June to 116° 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
January05:2812:0618:4413 h 16 min87.3°
February05:4712:0818:2912 h 42 min77.9°
March05:5912:0218:0512 h 06 min67.1°
April06:1011:5317:3711 h 27 min55.5°
May06:2311:5117:2010 h 57 min47.3°
June06:3411:5717:1910 h 45 min44.1°
July06:3312:0117:3010 h 57 min47.2°
August06:1511:5817:4211 h 27 min55.6°
September05:4511:4817:5112 h 05 min67.0°
October05:1811:3918:0112 h 44 min78.4°
November05:0211:4118:1913 h 17 min87.5°
December05:0711:5318:3813 h 31 min89.0°

A year of daylight in Barra do Piraí

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 Barra do Piraí

Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

23°collects the most energy over a year: 1489 kWh per kWp.

25°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 23°Best worst-month 25°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearJune kWh/kWp/dayBest ÷ worst month
0°138993%2.811.7×
15°147699%3.481.4×
22° = latitude1488100%3.711.2×
23° year-round best1489100%3.741.2×
25° off-grid best1488100%3.801.2×
30°148099%3.921.2×
45°139994%4.121.4×
60°124083%4.081.8×
70°109774%3.902.2×
90°76952%3.242.9×

A fixed array in Barra do Piraí produces the most over a year at 23°. The design month for an off-grid system is June: at 25° it makes 3.80 kWh per kWp a day, 2% more than at 23°, and costs 0% of the yearly total. Why steep panels win winter.

Off-grid solar in Barra do Piraí at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 23° (year-round best).

012345January: 2.01 (70°)2.0JanFebruary: 2.56 (70°)2.6FebMarch: 2.99 (70°)3.0MarApril: 3.56 (70°)3.6AprMay: 3.62 (70°)3.6MayJune: 3.90 (70°)3.9JunJuly: 4.03 (70°)4.0JulAugust: 3.92 (70°)3.9AugSeptember: 3.09 (70°)3.1SepOctober: 2.49 (70°)2.5OctNovember: 2.01 (70°)2.0NovDecember: 1.87 (70°)1.9Dec23°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 23°Mean temp.
January5.692.492.014.2023.8 °C
February5.893.132.564.5923.7 °C
March5.113.632.994.2922.9 °C
April4.514.283.564.1921.4 °C
May3.714.313.623.7418.9 °C
June3.504.633.903.7418.2 °C
July3.694.774.033.9317.9 °C
August4.344.673.924.2919.1 °C
September4.643.723.094.1020.9 °C
October5.033.032.494.0422.3 °C
November5.072.472.013.8322.2 °C
December5.532.311.874.0323.4 °C
Year4.72 avg3.62 avg1097 kWh1489 kWh

Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 630 Wp of panels at 70°, versus 320 Wp at 23°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Barra do Piraí

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.

2.9 mrow pitch at 70°

2.7 mrow pitch at 23°

Row spacing calculator

How Barra do Piraí compares in Brazil

Against the other 2,263 places in Brazil with climate data, for a fixed array at its best angle.

1905thof 2,264 places in Brazil for sunshine, shared: 4.72 peak sun hours a day on flat ground.

−6%solar energy a year compared with the average place in Brazil: 1,489 against 1,581 kWh per kWp.

−5 mindaylight on the longest day, compared with São Paulo: 13 h 31 min against 13 h 35 min.

23°best year-round tilt here; across Brazil it runs from 0° in Macapá to 28° in Santa Vitória do Palmar.

Of the 2,264 places in Brazil, Catolé do Rocha gets the most sun (6.16 peak sun hours a day) and Paranaguá the least (4.01); Barra do Piraí ranks joint 1905th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.87 kWh a day here, against 1.56 kWh on average in Brazil. The shortest day lasts 10 h 45 min, +4 min compared with São Paulo.

The sunniest places in Brazil

Solar forecast for Barra do Piraí, 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 Barra do Piraí

What is the best solar panel angle in Barra do Piraí?
For a fixed array facing north, the best year-round tilt in Barra do Piraí is 23°, worth about 1489 kWh per kWp a year. An off-grid system that has to get through June does better at about 25°.
What time is sunrise and sunset in Barra do Piraí today?
On 24 October 2026 the sun rises at 05:16 and sets at 18:03 local time (UTC−3), giving 12 h 47 min of daylight. Solar noon is at 11:39.
How many peak sun hours does Barra do Piraí get?
On a flat surface 4.7 hours a day averaged over the year, from 3.5 in June to 5.9 in February. Panels tilted at 70° receive 2.3 sun hours a day in December.
How high does the sun get in Barra do Piraí?
At solar noon the sun stands 44.1° above the horizon on the June solstice and 89.0° on the December solstice.
Is Barra do Piraí a good place for solar panels?
With 4.7 peak sun hours a day on flat ground, Barra do Piraí ranks joint 1905th of 2,264 places in Brazil for sunshine. A 1 kWp array at the best angle (23°) makes about 1,489 kWh a year here, 6% less than the average place in Brazil.

Places near Barra do Piraí

All places in Brazil

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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.