La Paz Department · Bolivia · 16.65° S · 68.30° W
Solar position in Viacha
Sun position, daylight and the best solar panel angle for Viacha — computed for 16.65° S, 68.30° W, 3870 m above sea level.
The sun right now
Sun in Viacha today
Saturday, 24 October 2026 · local time UTC−4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:45 | sun 18° below horizon |
| Nautical dawn | 05:11 | 12° below |
| Civil dawn | 05:37 | 6° below |
| Sunrise | 05:59 | 103° ESE |
| Golden hour ends | 06:28 | sun 6° up |
| Solar noon | 12:17 | 85.3° high |
| Golden hour starts | 18:06 | sun 6° up |
| Sunset | 18:35 | 257° WSW |
| Civil dusk | 18:57 | 6° below |
| Nautical dusk | 19:23 | 12° below |
| Astronomical dusk | 19:50 | 18° below |
| Day length | 12 h 36 min | |
Sun path diagram for Viacha
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 49.9° at solar noon in Viacha; on the December solstice only 83.2°. Sunrise swings from 66° ENE in June to 115° ESE in December — a 49° 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 | 06:15 | 12:44 | 19:12 | 12 h 57 min | 86.9° |
| February | 06:30 | 12:46 | 19:02 | 12 h 32 min | 83.7° |
| March | 06:37 | 12:40 | 18:43 | 12 h 06 min | 72.9° |
| April | 06:42 | 12:31 | 18:20 | 11 h 38 min | 61.3° |
| May | 06:51 | 12:29 | 18:08 | 11 h 17 min | 53.1° |
| June | 07:00 | 12:35 | 18:09 | 11 h 08 min | 49.9° |
| July | 07:01 | 12:39 | 18:17 | 11 h 16 min | 53.0° |
| August | 06:47 | 12:36 | 18:25 | 11 h 38 min | 61.4° |
| September | 06:23 | 12:26 | 18:29 | 12 h 06 min | 72.8° |
| October | 06:01 | 12:17 | 18:34 | 12 h 33 min | 84.2° |
| November | 05:50 | 12:19 | 18:47 | 12 h 58 min | 86.6° |
| December | 05:57 | 12:31 | 19:05 | 13 h 07 min | 83.2° |
A year of daylight in Viacha
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 Viacha
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
20°collects the most energy over a year: 1915 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 | January kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1815 | 95% | 4.97 | 1.3× |
| 8° off-grid best | 1878 | 98% | 4.84 | 1.2× |
| 15° | 1908 | 100% | 4.67 | 1.2× |
| 17° = latitude | 1912 | 100% | 4.61 | 1.2× |
| 20° year-round best | 1915 | 100% | 4.51 | 1.3× |
| 30° | 1890 | 99% | 4.12 | 1.4× |
| 45° | 1764 | 92% | 3.38 | 1.9× |
| 60° | 1540 | 80% | 2.52 | 2.6× |
| 70° | 1347 | 70% | 1.94 | 3.3× |
| 90° | 937 | 49% | 1.31 | 4.1× |
A fixed array in Viacha produces the most over a year at 20°. The design month for an off-grid system is January: at 8° it makes 4.84 kWh per kWp a day, 7% more than at 20°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in Viacha at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 20° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 20° | Mean temp. |
|---|---|---|---|---|---|
| January | 5.88 | 2.27 | 1.94 | 4.51 | 9.9 °C |
| February | 5.81 | 2.82 | 2.43 | 4.70 | 9.7 °C |
| March | 5.79 | 3.65 | 3.17 | 4.98 | 9.6 °C |
| April | 5.64 | 4.88 | 4.27 | 5.32 | 8.9 °C |
| May | 5.41 | 6.15 | 5.41 | 5.62 | 7.4 °C |
| June | 5.11 | 6.59 | 5.81 | 5.57 | 6.5 °C |
| July | 5.24 | 6.40 | 5.67 | 5.62 | 6.0 °C |
| August | 5.80 | 5.74 | 5.06 | 5.77 | 6.9 °C |
| September | 6.11 | 4.37 | 3.82 | 5.50 | 8.3 °C |
| October | 6.58 | 3.26 | 2.82 | 5.43 | 9.7 °C |
| November | 6.82 | 2.38 | 2.02 | 5.22 | 10.6 °C |
| December | 6.21 | 2.10 | 1.78 | 4.66 | 10.3 °C |
| Year | 5.87 avg | 4.22 avg | 1347 kWh | 1915 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 660 Wp of panels at 70°, versus 260 Wp at 20°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Viacha
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.
2.5 mrow pitch at 70°
2.5 mrow pitch at 20°
How Viacha compares in Bolivia
Against the other 38 places in Bolivia with climate data, for a fixed array at its best angle.
9thof 39 places in Bolivia for sunshine: 5.87 peak sun hours a day on flat ground.
+14%solar energy a year compared with the average place in Bolivia: 1,915 against 1,680 kWh per kWp.
+1 mindaylight on the longest day, compared with La Paz: 13 h 08 min against 13 h 07 min.
20°best year-round tilt here; across Bolivia it runs from 14° in Riberalta to 25° in Villazón.
Of the 39 places in Bolivia, Tupiza gets the most sun (6.59 peak sun hours a day) and Villa Yapacaní the least (4.60); Viacha ranks 9th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.78 kWh a day here, against 1.69 kWh on average in Bolivia. The shortest day lasts 11 h 08 min, −1 min compared with La Paz.
Solar forecast for Viacha, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
Loading the latest forecast…
Questions about the sun in Viacha
What is the best solar panel angle in Viacha?
What time is sunrise and sunset in Viacha today?
How many peak sun hours does Viacha get?
How high does the sun get in Viacha?
Is Viacha a good place for solar panels?
Places near Viacha
Put this on your site
A free, live card for Viacha: 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.