Brunei · 4.80° N · 114.65° E
Solar position in Tutong
Sun position, daylight and the best solar panel angle for Tutong — computed for 4.80° N, 114.65° E, 8 m above sea level.
The sun right now
Sun in Tutong today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:55 | sun 18° below horizon |
| Nautical dawn | 05:20 | 12° below |
| Civil dawn | 05:45 | 6° below |
| Sunrise | 06:06 | 102° ESE |
| Golden hour ends | 06:34 | sun 6° up |
| Solar noon | 12:05 | 73.1° high |
| Golden hour starts | 17:36 | sun 6° up |
| Sunset | 18:04 | 258° WSW |
| Civil dusk | 18:25 | 6° below |
| Nautical dusk | 18:50 | 12° below |
| Astronomical dusk | 19:15 | 18° below |
| Day length | 11 h 59 min | |
Sun path diagram for Tutong
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 71.4° at solar noon in Tutong; on the December solstice only 61.8°. Sunrise swings from 66° ENE in June to 113° 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 | 06:35 | 12:32 | 18:29 | 11 h 53 min | 65.3° |
| February | 06:35 | 12:35 | 18:34 | 12 h 00 min | 74.6° |
| March | 06:25 | 12:28 | 18:32 | 12 h 07 min | 85.4° |
| April | 06:12 | 12:20 | 18:27 | 12 h 15 min | 83.0° |
| May | 06:07 | 12:17 | 18:28 | 12 h 21 min | 74.6° |
| June | 06:11 | 12:23 | 18:35 | 12 h 24 min | 71.4° |
| July | 06:17 | 12:27 | 18:38 | 12 h 22 min | 74.3° |
| August | 06:17 | 12:24 | 18:32 | 12 h 15 min | 82.7° |
| September | 06:11 | 12:14 | 18:18 | 12 h 07 min | 85.9° |
| October | 06:06 | 12:06 | 18:05 | 11 h 59 min | 74.5° |
| November | 06:10 | 12:07 | 18:03 | 11 h 53 min | 65.3° |
| December | 06:23 | 12:19 | 18:14 | 11 h 51 min | 61.8° |
A year of daylight in Tutong
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 Tutong
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
3°collects the most energy over a year: 1486 kWh per kWp.
6°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° | 1484 | 100% | 3.70 | 1.2× |
| 3° year-round best | 1486 | 100% | 3.78 | 1.2× |
| 5° = latitude | 1486 | 100% | 3.82 | 1.2× |
| 6° off-grid best | 1485 | 100% | 3.85 | 1.2× |
| 15° | 1463 | 98% | 4.01 | 1.3× |
| 30° | 1365 | 92% | 4.11 | 1.5× |
| 45° | 1195 | 80% | 3.99 | 1.8× |
| 60° | 970 | 65% | 3.65 | 2.5× |
| 70° | 810 | 54% | 3.32 | 2.9× |
| 90° | 555 | 37% | 2.44 | 2.4× |
A fixed array in Tutong produces the most over a year at 3°. The design month for an off-grid system is December: at 6° it makes 3.85 kWh per kWp a day, 2% more than at 3°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Tutong at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 3° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 3° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.76 | 3.99 | 3.26 | 3.85 | 25.7 °C |
| February | 5.30 | 3.79 | 3.10 | 4.27 | 25.5 °C |
| March | 5.67 | 3.15 | 2.55 | 4.54 | 25.9 °C |
| April | 5.70 | 2.13 | 1.70 | 4.51 | 26.6 °C |
| May | 5.31 | 1.53 | 1.20 | 4.15 | 26.8 °C |
| June | 5.03 | 1.47 | 1.15 | 3.92 | 26.6 °C |
| July | 5.06 | 1.49 | 1.17 | 3.96 | 26.4 °C |
| August | 5.22 | 1.85 | 1.46 | 4.11 | 26.4 °C |
| September | 5.08 | 2.55 | 2.05 | 4.03 | 26.3 °C |
| October | 4.84 | 3.18 | 2.58 | 3.88 | 26.1 °C |
| November | 4.83 | 3.85 | 3.14 | 3.89 | 26.1 °C |
| December | 4.67 | 4.07 | 3.32 | 3.78 | 26.1 °C |
| Year | 5.12 avg | 2.75 avg | 810 kWh | 1486 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 1,030 Wp of panels at 70°, versus 310 Wp at 3°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Tutong
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 3°
How Tutong compares in Brunei
Against the other 7 places in Brunei with climate data, for a fixed array at its best angle.
3rdof 8 places in Brunei for sunshine, shared: 5.12 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in Brunei: 1,486 against 1,486 kWh per kWp.
±0 mindaylight on the longest day, compared with Bandar Seri Begawan: 12 h 24 min against 12 h 24 min.
3°best year-round tilt here; across Brunei it runs from 3° in Bandar Seri Begawan to 4° in Sengkurong.
Of the 8 places in Brunei, Serasa gets the most sun (5.15 peak sun hours a day) and Kuala Belait and one other place the least (5.09); Tutong ranks joint 3rd. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.15 kWh a day here, against 1.15 kWh on average in Brunei. The shortest day lasts 11 h 51 min, ±0 min compared with Bandar Seri Begawan.
Solar forecast for Tutong, 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 Tutong
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Places near Tutong
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A free, live card for Tutong: 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.