South Sulawesi · Indonesia · 2.97° S · 119.90° E
Solar position in Rantepao
Sun position, daylight and the best solar panel angle for Rantepao — computed for 2.97° S, 119.90° E, 784 m above sea level.
The sun right now
Sun in Rantepao today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:28 | sun 18° below horizon |
| Nautical dawn | 04:52 | 12° below |
| Civil dawn | 05:17 | 6° below |
| Sunrise | 05:38 | 102° ESE |
| Golden hour ends | 06:06 | sun 6° up |
| Solar noon | 11:44 | 80.9° high |
| Golden hour starts | 17:22 | sun 6° up |
| Sunset | 17:50 | 258° WSW |
| Civil dusk | 18:11 | 6° below |
| Nautical dusk | 18:36 | 12° below |
| Astronomical dusk | 19:01 | 18° below |
| Day length | 12 h 12 min | |
Sun path diagram for Rantepao
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 63.6° at solar noon in Rantepao; on the December solstice only 69.5°. Sunrise swings from 67° ENE in June to 114° ESE in December — a 47° 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.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 06:03 | 12:11 | 18:19 | 12 h 16 min | 73.1° |
| February | 06:08 | 12:14 | 18:19 | 12 h 11 min | 82.4° |
| March | 06:04 | 12:07 | 18:10 | 12 h 06 min | 86.8° |
| April | 05:58 | 11:59 | 18:00 | 12 h 02 min | 75.2° |
| May | 05:57 | 11:56 | 17:56 | 11 h 58 min | 66.9° |
| June | 06:03 | 12:02 | 18:00 | 11 h 57 min | 63.6° |
| July | 06:07 | 12:06 | 18:05 | 11 h 58 min | 66.6° |
| August | 06:02 | 12:03 | 18:04 | 12 h 02 min | 74.9° |
| September | 05:50 | 11:53 | 17:56 | 12 h 06 min | 86.3° |
| October | 05:39 | 11:45 | 17:50 | 12 h 11 min | 82.3° |
| November | 05:38 | 11:46 | 17:54 | 12 h 16 min | 73.1° |
| December | 05:49 | 11:58 | 18:07 | 12 h 18 min | 69.5° |
A year of daylight in Rantepao
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Rantepao
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
4°collects the most energy over a year: 1506 kWh per kWp.
8°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | June kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1503 | 100% | 3.60 | 1.3× |
| 3° = latitude | 1506 | 100% | 3.68 | 1.3× |
| 4° year-round best | 1506 | 100% | 3.70 | 1.2× |
| 8° off-grid best | 1503 | 100% | 3.79 | 1.2× |
| 15° | 1484 | 99% | 3.91 | 1.3× |
| 30° | 1384 | 92% | 4.01 | 1.4× |
| 45° | 1212 | 80% | 3.89 | 1.8× |
| 60° | 982 | 65% | 3.55 | 2.4× |
| 70° | 821 | 55% | 3.21 | 2.7× |
| 90° | 556 | 37% | 2.32 | 2.2× |
A fixed array in Rantepao produces the most over a year at 4°. The design month for an off-grid system is June: at 8° it makes 3.79 kWh per kWp a day, 2% more than at 4°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Rantepao at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 4° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 4° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.98 | 1.65 | 1.31 | 3.92 | 22.9 °C |
| February | 5.16 | 1.92 | 1.54 | 4.10 | 23.0 °C |
| March | 5.27 | 2.57 | 2.10 | 4.23 | 23.2 °C |
| April | 5.15 | 3.36 | 2.76 | 4.19 | 23.4 °C |
| May | 4.88 | 3.89 | 3.20 | 4.00 | 23.5 °C |
| June | 4.49 | 3.89 | 3.21 | 3.70 | 22.9 °C |
| July | 4.58 | 3.85 | 3.18 | 3.78 | 22.5 °C |
| August | 5.08 | 3.65 | 3.02 | 4.17 | 22.6 °C |
| September | 5.70 | 3.04 | 2.49 | 4.62 | 23.0 °C |
| October | 5.79 | 2.08 | 1.67 | 4.61 | 23.6 °C |
| November | 5.46 | 1.52 | 1.20 | 4.29 | 23.7 °C |
| December | 4.97 | 1.59 | 1.27 | 3.89 | 23.3 °C |
| Year | 5.12 avg | 2.75 avg | 821 kWh | 1506 kWh |
Sizing example. To run a 1 kWh-per-day load through November on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 980 Wp of panels at 70°, versus 320 Wp at 4°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Rantepao
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.
1.8 mrow pitch at 70°
2.1 mrow pitch at 4°
How Rantepao compares in Indonesia
Against the other 446 places in Indonesia with climate data, for a fixed array at its best angle.
207thof 447 places in Indonesia for sunshine, shared: 5.12 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Indonesia: 1,506 against 1,498 kWh per kWp.
−11 mindaylight on the longest day, compared with Jakarta: 12 h 18 min against 12 h 29 min.
4°best year-round tilt here; across Indonesia it runs from 0° in Batam to 12° in Kupang.
Of the 447 places in Indonesia, Lewoleba gets the most sun (5.95 peak sun hours a day) and Kuala Tungkal the least (4.48); Rantepao ranks joint 207th. In its darkest month, November, 1 kWp of off-grid panels at 70° makes 1.20 kWh a day here, against 1.26 kWh on average in Indonesia. The shortest day lasts 11 h 57 min, +11 min compared with Jakarta.
Solar forecast for Rantepao, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Rantepao
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A free, live card for Rantepao: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
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.