Cambodia · 11.09° N · 105.80° E
Solar position in Svay Rieng
Sun position, daylight and the best solar panel angle for Svay Rieng — computed for 11.09° N, 105.80° E, 12 m above sea level.
The sun right now
Sun in Svay Rieng today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:35 | sun 18° below horizon |
| Nautical dawn | 05:00 | 12° below |
| Civil dawn | 05:25 | 6° below |
| Sunrise | 05:47 | 102° ESE |
| Golden hour ends | 06:15 | sun 6° up |
| Solar noon | 11:40 | 66.8° high |
| Golden hour starts | 17:06 | sun 6° up |
| Sunset | 17:34 | 258° WSW |
| Civil dusk | 17:56 | 6° below |
| Nautical dusk | 18:21 | 12° below |
| Astronomical dusk | 18:45 | 18° below |
| Day length | 11 h 48 min | |
Sun path diagram for Svay Rieng
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 77.7° at solar noon in Svay Rieng; on the December solstice only 55.5°. Sunrise swings from 66° ENE in June to 114° ESE in December — a 48° 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 | 06:20 | 12:08 | 17:55 | 11 h 35 min | 59.0° |
| February | 06:15 | 12:10 | 18:05 | 11 h 50 min | 68.4° |
| March | 06:00 | 12:04 | 18:07 | 12 h 07 min | 79.2° |
| April | 05:42 | 11:55 | 18:08 | 12 h 26 min | 89.2° |
| May | 05:33 | 11:53 | 18:13 | 12 h 40 min | 80.9° |
| June | 05:35 | 11:58 | 18:21 | 12 h 47 min | 77.7° |
| July | 05:42 | 12:03 | 18:23 | 12 h 41 min | 80.6° |
| August | 05:46 | 12:00 | 18:13 | 12 h 26 min | 89.0° |
| September | 05:46 | 11:49 | 17:53 | 12 h 08 min | 79.6° |
| October | 05:46 | 11:41 | 17:36 | 11 h 50 min | 68.2° |
| November | 05:55 | 11:42 | 17:29 | 11 h 35 min | 59.0° |
| December | 06:10 | 11:54 | 17:39 | 11 h 29 min | 55.5° |
A year of daylight in Svay Rieng
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 Svay Rieng
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
12°collects the most energy over a year: 1527 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 | July kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1501 | 98% | 3.98 | 1.2× |
| 6° off-grid best | 1521 | 100% | 3.89 | 1.2× |
| 11° = latitude | 1527 | 100% | 3.80 | 1.2× |
| 12° year-round best | 1527 | 100% | 3.77 | 1.2× |
| 15° | 1525 | 100% | 3.70 | 1.3× |
| 30° | 1466 | 96% | 3.23 | 1.5× |
| 45° | 1328 | 87% | 2.60 | 1.8× |
| 60° | 1123 | 74% | 1.88 | 2.5× |
| 70° | 959 | 63% | 1.42 | 3.0× |
| 90° | 660 | 43% | 1.11 | 2.9× |
A fixed array in Svay Rieng produces the most over a year at 12°. The design month for an off-grid system is July: at 6° it makes 3.89 kWh per kWp a day, 3% more than at 12°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Svay Rieng at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 12° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 12° | Mean temp. |
|---|---|---|---|---|---|
| January | 5.08 | 4.97 | 4.05 | 4.42 | 26.9 °C |
| February | 5.62 | 4.55 | 3.68 | 4.70 | 28.7 °C |
| March | 5.78 | 3.64 | 2.91 | 4.61 | 30.4 °C |
| April | 5.82 | 2.62 | 2.07 | 4.45 | 31.1 °C |
| May | 5.51 | 1.92 | 1.51 | 4.11 | 29.6 °C |
| June | 5.21 | 1.70 | 1.33 | 3.86 | 27.9 °C |
| July | 5.03 | 1.80 | 1.42 | 3.77 | 27.2 °C |
| August | 5.04 | 2.18 | 1.74 | 3.87 | 27.1 °C |
| September | 4.88 | 2.80 | 2.26 | 3.87 | 27.0 °C |
| October | 4.95 | 3.61 | 2.93 | 4.08 | 26.8 °C |
| November | 4.93 | 4.50 | 3.67 | 4.23 | 26.6 °C |
| December | 4.86 | 4.95 | 4.04 | 4.27 | 26.2 °C |
| Year | 5.22 avg | 3.27 avg | 959 kWh | 1527 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 890 Wp of panels at 70°, versus 310 Wp at 12°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Svay Rieng
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.
2.1 mrow pitch at 70°
2.3 mrow pitch at 12°
How Svay Rieng compares in Cambodia
Against the other 45 places in Cambodia with climate data, for a fixed array at its best angle.
19thof 46 places in Cambodia for sunshine, shared: 5.22 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in Cambodia: 1,527 against 1,520 kWh per kWp.
−2 mindaylight on the longest day, compared with Phnom Penh: 12 h 47 min against 12 h 48 min.
12°best year-round tilt here; across Cambodia it runs from 12° in Phnom Penh to 16° in Anlong Veaeng.
Of the 46 places in Cambodia, Snuol gets the most sun (5.29 peak sun hours a day) and Smach Mean Chey the least (4.78); Svay Rieng ranks joint 19th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.33 kWh a day here, against 1.39 kWh on average in Cambodia. The shortest day lasts 11 h 29 min, +2 min compared with Phnom Penh.
Solar forecast for Svay Rieng, 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 Svay Rieng: 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.