Solarposition.org

Rhône-Alpes · France · 45.05° N · 5.07° E

Solar position in Romans-sur-Isère

Sun position, daylight and the best solar panel angle for Romans-sur-Isère — computed for 45.05° N, 5.07° E, 170 m above sea level.

Sunrise today08:07106° ESE
Sunset today18:39254° WSW
Best panel angle37°year-round, facing south
Off-grid angle69°best for the darkest month

The sun right now

Azimuth180.0°
Elevation33.1°
At solar noon, 13:23Open on the sun map

Sun in Romans-sur-Isère today

Saturday, 24 October 2026 · local time UTC+2

EventTimeDirection / height
Astronomical dawn06:28sun 18° below horizon
Nautical dawn07:0212° below
Civil dawn07:376° below
Sunrise08:07106° ESE
Golden hour ends08:48sun 6° up
Solar noon13:2333.1° high
Golden hour starts17:58sun 6° up
Sunset18:39254° WSW
Civil dusk19:106° below
Nautical dusk19:4412° below
Astronomical dusk20:1818° below
Day length10 h 33 min

Sun path diagram for Romans-sur-Isère

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 solstice789101112131415161718192021EquinoxDecember solstice910111213141516Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 68.4° at solar noon in Romans-sur-Isère; on the December solstice only 21.6°. Sunrise swings from 55° NE in June to 123° ESE in December — a 69° 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
January08:1012:5117:319 h 21 min25.1°
February07:3112:5318:1510 h 44 min34.5°
March06:4112:4718:5312 h 12 min45.3°
April06:4413:3820:3213 h 48 min56.9°
May06:0413:3621:0815 h 04 min65.2°
June05:5213:4121:3015 h 38 min68.4°
July06:1213:4621:1815 h 06 min65.4°
August06:4813:4220:3613 h 48 min57.0°
September07:2513:3219:3912 h 14 min45.6°
October08:0313:2418:4410 h 42 min34.2°
November07:4512:2517:059 h 20 min25.0°
December08:1412:3717:008 h 46 min21.6°

A year of daylight in Romans-sur-Isère

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 Romans-sur-Isère

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

37°collects the most energy over a year: 1406 kWh per kWp.

69°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 37°Best worst-month 69°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°116583%0.975.6×
15°132094%1.503.7×
30°139899%1.932.8×
37° year-round best1406100%2.102.5×
45° = latitude139499%2.252.2×
60°131093%2.411.8×
69° off-grid best122387%2.441.6×
70°121286%2.441.6×
90°93466%2.281.5×

A fixed array in Romans-sur-Isère produces the most over a year at 37°. The design month for an off-grid system is December: at 69° it makes 2.44 kWh per kWp a day, 16% more than at 37°, and costs 13% of the yearly total. Why steep panels win winter.

Off-grid solar in Romans-sur-Isère at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 37° (year-round best).

0123456January: 2.62 (70°)2.6JanFebruary: 3.28 (70°)3.3FebMarch: 3.80 (70°)3.8MarApril: 3.69 (70°)3.7AprMay: 3.39 (70°)3.4MayJune: 3.44 (70°)3.4JunJuly: 3.57 (70°)3.6JulAugust: 3.80 (70°)3.8AugSeptember: 3.92 (70°)3.9SepOctober: 3.28 (70°)3.3OctNovember: 2.63 (70°)2.6NovDecember: 2.44 (70°)2.4Dec37°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 37°Mean temp.
January1.462.922.622.321.2 °C
February2.343.663.283.161.9 °C
March3.624.303.804.095.6 °C
April4.794.253.694.549.5 °C
May5.613.973.394.6713.3 °C
June6.594.113.445.0918.1 °C
July6.644.303.575.1920.5 °C
August5.694.553.804.9420.0 °C
September4.304.613.924.4215.7 °C
October2.703.793.283.2911.4 °C
November1.632.992.632.405.8 °C
December1.232.732.442.102.1 °C
Year3.89 avg3.85 avg1212 kWh1406 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 480 Wp of panels at 70°, versus 560 Wp at 37°. The steep array is 14% smaller for the same winter. Size your own system.

Row spacing in Romans-sur-Isère

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.

6.3 mrow pitch at 70°

5.2 mrow pitch at 37°

Row spacing calculator

How Romans-sur-Isère compares in France

Against the other 656 places in France with climate data, for a fixed array at its best angle.

94thof 657 places in France for sunshine: 3.89 peak sun hours a day on flat ground.

+11%solar energy a year compared with the average place in France: 1,406 against 1,261 kWh per kWp.

−33 mindaylight on the longest day, compared with Paris: 15 h 38 min against 16 h 11 min.

37°best year-round tilt here; across France it runs from 33° in Ajaccio to 39° in Lille.

Of the 657 places in France, Marseille 12 and 5 other places get the most sun (4.46 peak sun hours a day) and Maubeuge and one other place the least (3.10); Romans-sur-Isère ranks 94th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.44 kWh a day here, against 1.86 kWh on average in France. The shortest day lasts 8 h 46 min, +31 min compared with Paris.

The sunniest places in France

Solar forecast for Romans-sur-Isère, 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 Romans-sur-Isère

What is the best solar panel angle in Romans-sur-Isère?
For a fixed array facing south, the best year-round tilt in Romans-sur-Isère is 37°, worth about 1406 kWh per kWp a year. An off-grid system that has to get through December does better at about 69°.
What time is sunrise and sunset in Romans-sur-Isère today?
On 24 October 2026 the sun rises at 08:07 and sets at 18:39 local time (UTC+2), giving 10 h 33 min of daylight. Solar noon is at 13:23.
How many peak sun hours does Romans-sur-Isère get?
On a flat surface 3.9 hours a day averaged over the year, from 1.2 in December to 6.6 in July. Panels tilted at 70° receive 2.7 sun hours a day in December.
How high does the sun get in Romans-sur-Isère?
At solar noon the sun stands 68.4° above the horizon on the June solstice and 21.6° on the December solstice.
Is Romans-sur-Isère a good place for solar panels?
With 3.9 peak sun hours a day on flat ground, Romans-sur-Isère ranks 94th of 657 places in France for sunshine. A 1 kWp array at the best angle (37°) makes about 1,406 kWh a year here, 11% more than the average place in France.

Places near Romans-sur-Isère

All places in France

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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.