South Sumatra · Indonesia · 3.25° S · 104.68° E
Solar position in Indralaya
Sun position, daylight and the best solar panel angle for Indralaya — computed for 3.25° S, 104.68° E, 8 m above sea level.
The sun right now
Sun in Indralaya today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:28 | sun 18° below horizon |
| Nautical dawn | 04:53 | 12° below |
| Civil dawn | 05:18 | 6° below |
| Sunrise | 05:39 | 102° ESE |
| Golden hour ends | 06:07 | sun 6° up |
| Solar noon | 11:45 | 81.2° high |
| Golden hour starts | 17:23 | sun 6° up |
| Sunset | 17:51 | 258° WSW |
| Civil dusk | 18:12 | 6° below |
| Nautical dusk | 18:37 | 12° below |
| Astronomical dusk | 19:02 | 18° below |
| Day length | 12 h 12 min | |
Sun path diagram for Indralaya
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 63.3° at solar noon in Indralaya; on the December solstice only 69.8°. 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 | 06:04 | 12:12 | 18:20 | 12 h 17 min | 73.4° |
| February | 06:09 | 12:14 | 18:20 | 12 h 12 min | 82.7° |
| March | 06:05 | 12:08 | 18:11 | 12 h 06 min | 86.5° |
| April | 05:59 | 11:59 | 18:00 | 12 h 01 min | 74.9° |
| May | 05:59 | 11:57 | 17:56 | 11 h 58 min | 66.6° |
| June | 06:05 | 12:03 | 18:01 | 11 h 56 min | 63.3° |
| July | 06:09 | 12:07 | 18:06 | 11 h 57 min | 66.3° |
| August | 06:04 | 12:04 | 18:05 | 12 h 01 min | 74.6° |
| September | 05:51 | 11:54 | 17:57 | 12 h 06 min | 86.0° |
| October | 05:40 | 11:45 | 17:51 | 12 h 12 min | 82.6° |
| November | 05:38 | 11:47 | 17:55 | 12 h 17 min | 73.3° |
| December | 05:49 | 11:59 | 18:08 | 12 h 19 min | 69.8° |
A year of daylight in Indralaya
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 Indralaya
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
6°collects the most energy over a year: 1393 kWh per kWp.
0°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° off-grid best | 1388 | 100% | 3.58 | 1.1× |
| 3° = latitude | 1392 | 100% | 3.53 | 1.2× |
| 6° year-round best | 1393 | 100% | 3.48 | 1.2× |
| 15° | 1379 | 99% | 3.28 | 1.3× |
| 30° | 1300 | 93% | 2.82 | 1.5× |
| 45° | 1156 | 83% | 2.24 | 1.7× |
| 60° | 958 | 69% | 1.62 | 2.2× |
| 70° | 814 | 58% | 1.38 | 2.4× |
| 90° | 564 | 40% | 1.19 | 2.1× |
A fixed array in Indralaya produces the most over a year at 6°. The design month for an off-grid system is December: at 0° it makes 3.58 kWh per kWp a day, 3% more than at 6°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Indralaya at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 6° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 6° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.53 | 1.70 | 1.34 | 3.49 | 25.9 °C |
| February | 4.69 | 1.96 | 1.56 | 3.66 | 26.1 °C |
| March | 5.03 | 2.57 | 2.07 | 3.98 | 26.5 °C |
| April | 4.99 | 3.27 | 2.65 | 4.01 | 26.9 °C |
| May | 4.74 | 3.72 | 3.02 | 3.86 | 26.9 °C |
| June | 4.61 | 3.96 | 3.22 | 3.79 | 26.3 °C |
| July | 4.65 | 3.85 | 3.14 | 3.82 | 25.9 °C |
| August | 5.05 | 3.62 | 2.94 | 4.11 | 26.0 °C |
| September | 5.12 | 2.89 | 2.34 | 4.09 | 26.4 °C |
| October | 4.84 | 2.12 | 1.69 | 3.79 | 26.8 °C |
| November | 4.81 | 1.75 | 1.38 | 3.71 | 26.8 °C |
| December | 4.53 | 1.74 | 1.38 | 3.48 | 26.2 °C |
| Year | 4.80 avg | 2.77 avg | 814 kWh | 1393 kWh |
Sizing example. To run a 1 kWh-per-day load through January on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 880 Wp of panels at 70°, versus 340 Wp at 6°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Indralaya
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 6°
How Indralaya compares in Indonesia
Against the other 446 places in Indonesia with climate data, for a fixed array at its best angle.
380thof 447 places in Indonesia for sunshine, shared: 4.80 peak sun hours a day on flat ground.
−7%solar energy a year compared with the average place in Indonesia: 1,393 against 1,498 kWh per kWp.
−10 mindaylight on the longest day, compared with Jakarta: 12 h 19 min against 12 h 29 min.
6°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); Indralaya ranks joint 380th. In its darkest month, January, 1 kWp of off-grid panels at 70° makes 1.35 kWh a day here, against 1.26 kWh on average in Indonesia. The shortest day lasts 11 h 56 min, +10 min compared with Jakarta.
Solar forecast for Indralaya, 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 Indralaya
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Places near Indralaya
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A free, live card for Indralaya: 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.