Central Java · Indonesia · 7.72° S · 109.91° E
Solar position in Kutoarjo
Sun position, daylight and the best solar panel angle for Kutoarjo — computed for 7.72° S, 109.91° E, 20 m above sea level.
The sun right now
Sun in Kutoarjo today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:03 | sun 18° below horizon |
| Nautical dawn | 04:28 | 12° below |
| Civil dawn | 04:53 | 6° below |
| Sunrise | 05:14 | 102° ESE |
| Golden hour ends | 05:42 | sun 6° up |
| Solar noon | 11:24 | 85.6° high |
| Golden hour starts | 17:06 | sun 6° up |
| Sunset | 17:34 | 258° WSW |
| Civil dusk | 17:55 | 6° below |
| Nautical dusk | 18:20 | 12° below |
| Astronomical dusk | 18:45 | 18° below |
| Day length | 12 h 20 min | |
Sun path diagram for Kutoarjo
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 58.9° at solar noon in Kutoarjo; on the December solstice only 74.3°. Sunrise swings from 66° 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 | 05:36 | 11:51 | 18:06 | 12 h 30 min | 77.8° |
| February | 05:44 | 11:53 | 18:03 | 12 h 18 min | 87.2° |
| March | 05:44 | 11:47 | 17:50 | 12 h 06 min | 82.1° |
| April | 05:42 | 11:39 | 17:35 | 11 h 54 min | 70.4° |
| May | 05:44 | 11:36 | 17:29 | 11 h 44 min | 62.1° |
| June | 05:51 | 11:42 | 17:32 | 11 h 40 min | 58.9° |
| July | 05:54 | 11:46 | 17:38 | 11 h 44 min | 61.8° |
| August | 05:46 | 11:43 | 17:40 | 11 h 53 min | 70.2° |
| September | 05:30 | 11:33 | 17:36 | 12 h 06 min | 81.6° |
| October | 05:15 | 11:25 | 17:34 | 12 h 18 min | 87.0° |
| November | 05:11 | 11:26 | 17:41 | 12 h 30 min | 77.8° |
| December | 05:20 | 11:38 | 17:55 | 12 h 35 min | 74.3° |
A year of daylight in Kutoarjo
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 Kutoarjo
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
10°collects the most energy over a year: 1516 kWh per kWp.
1°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° | 1497 | 99% | 3.83 | 1.2× |
| 1° off-grid best | 1501 | 99% | 3.82 | 1.2× |
| 8° = latitude | 1516 | 100% | 3.69 | 1.3× |
| 10° year-round best | 1516 | 100% | 3.64 | 1.3× |
| 15° | 1513 | 100% | 3.52 | 1.4× |
| 30° | 1446 | 95% | 3.02 | 1.6× |
| 45° | 1301 | 86% | 2.39 | 1.9× |
| 60° | 1090 | 72% | 1.70 | 2.5× |
| 70° | 926 | 61% | 1.31 | 2.9× |
| 90° | 630 | 42% | 1.13 | 2.6× |
A fixed array in Kutoarjo produces the most over a year at 10°. The design month for an off-grid system is December: at 1° it makes 3.82 kWh per kWp a day, 5% more than at 10°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Kutoarjo at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 10° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 10° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.97 | 1.69 | 1.33 | 3.76 | 26.2 °C |
| February | 4.93 | 2.05 | 1.63 | 3.81 | 26.2 °C |
| March | 5.11 | 2.76 | 2.23 | 4.06 | 26.4 °C |
| April | 5.11 | 3.62 | 2.94 | 4.18 | 26.7 °C |
| May | 4.95 | 4.30 | 3.50 | 4.18 | 26.5 °C |
| June | 4.78 | 4.60 | 3.76 | 4.11 | 25.7 °C |
| July | 4.98 | 4.64 | 3.81 | 4.29 | 24.8 °C |
| August | 5.56 | 4.40 | 3.62 | 4.69 | 24.7 °C |
| September | 5.86 | 3.49 | 2.84 | 4.76 | 25.3 °C |
| October | 5.66 | 2.46 | 1.97 | 4.42 | 26.2 °C |
| November | 5.17 | 1.81 | 1.43 | 3.93 | 26.5 °C |
| December | 4.84 | 1.66 | 1.31 | 3.64 | 26.3 °C |
| Year | 5.16 avg | 3.13 avg | 926 kWh | 1516 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 900 Wp of panels at 70°, versus 320 Wp at 10°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Kutoarjo
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.
2.0 mrow pitch at 70°
2.2 mrow pitch at 10°
How Kutoarjo compares in Indonesia
Against the other 446 places in Indonesia with climate data, for a fixed array at its best angle.
197thof 447 places in Indonesia for sunshine, shared: 5.16 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Indonesia: 1,516 against 1,498 kWh per kWp.
+5 mindaylight on the longest day, compared with Jakarta: 12 h 35 min against 12 h 29 min.
10°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); Kutoarjo ranks joint 197th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.31 kWh a day here, against 1.26 kWh on average in Indonesia. The shortest day lasts 11 h 40 min, −5 min compared with Jakarta.
Solar forecast for Kutoarjo, 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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A free, live card for Kutoarjo: 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.