Beni Department · Bolivia · 14.85° S · 66.75° W
Solar position in San Borja
Sun position, daylight and the best solar panel angle for San Borja — computed for 14.85° S, 66.75° W, 195 m above sea level.
The sun right now
Sun in San Borja today
Saturday, 24 October 2026 · local time UTC−4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:41 | sun 18° below horizon |
| Nautical dawn | 05:07 | 12° below |
| Civil dawn | 05:33 | 6° below |
| Sunrise | 05:54 | 102° ESE |
| Golden hour ends | 06:23 | sun 6° up |
| Solar noon | 12:11 | 87.1° high |
| Golden hour starts | 17:58 | sun 6° up |
| Sunset | 18:27 | 257° WSW |
| Civil dusk | 18:49 | 6° below |
| Nautical dusk | 19:15 | 12° below |
| Astronomical dusk | 19:41 | 18° below |
| Day length | 12 h 33 min | |
Sun path diagram for San Borja
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 51.7° at solar noon in San Borja; on the December solstice only 81.4°. 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 | 06:12 | 12:38 | 19:03 | 12 h 51 min | 85.1° |
| February | 06:25 | 12:40 | 18:55 | 12 h 29 min | 85.5° |
| March | 06:31 | 12:34 | 18:36 | 12 h 06 min | 74.7° |
| April | 06:35 | 12:25 | 18:16 | 11 h 41 min | 63.1° |
| May | 06:42 | 12:23 | 18:04 | 11 h 22 min | 54.9° |
| June | 06:51 | 12:28 | 18:06 | 11 h 15 min | 51.7° |
| July | 06:52 | 12:33 | 18:14 | 11 h 22 min | 54.8° |
| August | 06:39 | 12:30 | 18:20 | 11 h 41 min | 63.2° |
| September | 06:17 | 12:20 | 18:22 | 12 h 06 min | 74.6° |
| October | 05:56 | 12:11 | 18:26 | 12 h 30 min | 86.0° |
| November | 05:47 | 12:12 | 18:38 | 12 h 52 min | 84.8° |
| December | 05:54 | 12:25 | 18:55 | 13 h 01 min | 81.4° |
A year of daylight in San Borja
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 San Borja
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
15°collects the most energy over a year: 1417 kWh per kWp.
21°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 | June kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1375 | 97% | 2.98 | 1.5× |
| 15° year-round best = latitude | 1417 | 100% | 3.47 | 1.2× |
| 21° off-grid best | 1411 | 100% | 3.61 | 1.2× |
| 30° | 1380 | 97% | 3.75 | 1.3× |
| 45° | 1267 | 89% | 3.81 | 1.6× |
| 60° | 1087 | 77% | 3.65 | 2.0× |
| 70° | 939 | 66% | 3.42 | 2.5× |
| 90° | 644 | 45% | 2.69 | 2.7× |
A fixed array in San Borja produces the most over a year at 15°. The design month for an off-grid system is June: at 21° it makes 3.61 kWh per kWp a day, 4% more than at 15°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in San Borja at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 15° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 15° | Mean temp. |
|---|---|---|---|---|---|
| January | 5.13 | 1.94 | 1.55 | 3.85 | 25.0 °C |
| February | 4.75 | 2.33 | 1.88 | 3.69 | 24.8 °C |
| March | 4.90 | 3.04 | 2.47 | 3.97 | 24.6 °C |
| April | 4.70 | 3.82 | 3.14 | 4.04 | 24.1 °C |
| May | 4.01 | 4.00 | 3.31 | 3.63 | 22.7 °C |
| June | 3.74 | 4.12 | 3.42 | 3.47 | 22.4 °C |
| July | 4.04 | 4.35 | 3.60 | 3.73 | 22.6 °C |
| August | 4.64 | 4.19 | 3.44 | 4.09 | 24.4 °C |
| September | 4.94 | 3.40 | 2.76 | 4.07 | 26.8 °C |
| October | 5.31 | 2.71 | 2.17 | 4.15 | 27.2 °C |
| November | 5.46 | 2.07 | 1.65 | 4.10 | 26.4 °C |
| December | 5.08 | 1.81 | 1.44 | 3.77 | 25.6 °C |
| Year | 4.73 avg | 3.15 avg | 939 kWh | 1417 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 820 Wp of panels at 70°, versus 340 Wp at 15°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in San Borja
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.
2.3 mrow pitch at 70°
2.4 mrow pitch at 15°
How San Borja compares in Bolivia
Against the other 38 places in Bolivia with climate data, for a fixed array at its best angle.
36thof 39 places in Bolivia for sunshine, shared: 4.72 peak sun hours a day on flat ground.
−16%solar energy a year compared with the average place in Bolivia: 1,417 against 1,680 kWh per kWp.
−6 mindaylight on the longest day, compared with La Paz: 13 h 01 min against 13 h 07 min.
15°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); San Borja ranks joint 36th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.44 kWh a day here, against 1.69 kWh on average in Bolivia. The shortest day lasts 11 h 15 min, +6 min compared with La Paz.
Solar forecast for San Borja, 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 San Borja
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A free, live card for San Borja: 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.