Lima region · Peru · 12.10° S · 77.04° W
Solar position in San Isidro
Sun position, daylight and the best solar panel angle for San Isidro — computed for 12.10° S, 77.04° W, 109 m above sea level.
The sun right now
Sun in San Isidro today
Saturday, 24 October 2026 · local time UTC−5
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:26 | sun 18° below horizon |
| Nautical dawn | 04:51 | 12° below |
| Civil dawn | 05:16 | 6° below |
| Sunrise | 05:38 | 102° ESE |
| Golden hour ends | 06:07 | sun 6° up |
| Solar noon | 11:52 | 89.8° high |
| Golden hour starts | 17:37 | sun 6° up |
| Sunset | 18:06 | 258° WSW |
| Civil dusk | 18:27 | 6° below |
| Nautical dusk | 18:53 | 12° below |
| Astronomical dusk | 19:18 | 18° below |
| Day length | 12 h 28 min | |
Sun path diagram for San Isidro
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 54.5° at solar noon in San Isidro; on the December solstice only 78.7°. 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 | 05:58 | 12:19 | 18:40 | 12 h 43 min | 82.3° |
| February | 06:09 | 12:21 | 18:34 | 12 h 25 min | 88.3° |
| March | 06:12 | 12:15 | 18:18 | 12 h 06 min | 77.5° |
| April | 06:13 | 12:06 | 17:59 | 11 h 46 min | 65.9° |
| May | 06:19 | 12:04 | 17:50 | 11 h 31 min | 57.6° |
| June | 06:27 | 12:10 | 17:52 | 11 h 25 min | 54.5° |
| July | 06:29 | 12:14 | 18:00 | 11 h 31 min | 57.5° |
| August | 06:18 | 12:11 | 18:04 | 11 h 46 min | 66.0° |
| September | 05:58 | 12:01 | 18:04 | 12 h 06 min | 77.4° |
| October | 05:39 | 11:52 | 18:05 | 12 h 26 min | 88.8° |
| November | 05:32 | 11:54 | 18:15 | 12 h 43 min | 82.1° |
| December | 05:41 | 12:06 | 18:31 | 12 h 50 min | 78.7° |
A year of daylight in San Isidro
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 Isidro
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
11°collects the most energy over a year: 1588 kWh per kWp.
28°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° | 1563 | 98% | 3.19 | 1.6× |
| 11° year-round best | 1588 | 100% | 3.52 | 1.4× |
| 12° = latitude | 1588 | 100% | 3.54 | 1.4× |
| 15° | 1585 | 100% | 3.61 | 1.4× |
| 28° off-grid best | 1532 | 96% | 3.81 | 1.3× |
| 30° | 1518 | 96% | 3.82 | 1.3× |
| 45° | 1367 | 86% | 3.81 | 1.6× |
| 60° | 1144 | 72% | 3.58 | 2.2× |
| 70° | 968 | 61% | 3.30 | 2.8× |
| 90° | 651 | 41% | 2.51 | 2.7× |
A fixed array in San Isidro produces the most over a year at 11°. The design month for an off-grid system is July: at 28° it makes 3.81 kWh per kWp a day, 8% more than at 11°, and costs 4% of the yearly total. Why steep panels win winter.
Off-grid solar in San Isidro at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 11° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 11° | Mean temp. |
|---|---|---|---|---|---|
| January | 6.01 | 1.83 | 1.49 | 4.67 | 18.7 °C |
| February | 5.84 | 2.45 | 2.02 | 4.67 | 19.3 °C |
| March | 5.73 | 3.29 | 2.75 | 4.75 | 19.1 °C |
| April | 5.61 | 4.39 | 3.70 | 4.87 | 18.1 °C |
| May | 4.81 | 4.68 | 3.96 | 4.34 | 16.9 °C |
| June | 3.93 | 4.12 | 3.50 | 3.59 | 16.0 °C |
| July | 3.88 | 3.88 | 3.30 | 3.52 | 15.4 °C |
| August | 4.32 | 3.64 | 3.10 | 3.82 | 15.3 °C |
| September | 4.87 | 3.19 | 2.70 | 4.15 | 15.5 °C |
| October | 5.61 | 2.66 | 2.23 | 4.61 | 15.8 °C |
| November | 6.00 | 2.00 | 1.65 | 4.75 | 16.6 °C |
| December | 5.81 | 1.71 | 1.39 | 4.51 | 17.6 °C |
| Year | 5.20 avg | 3.16 avg | 968 kWh | 1588 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 850 Wp of panels at 70°, versus 340 Wp at 11°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in San Isidro
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.
2.2 mrow pitch at 70°
2.3 mrow pitch at 11°
How San Isidro compares in Peru
Against the other 135 places in Peru with climate data, for a fixed array at its best angle.
73rdof 136 places in Peru for sunshine, shared: 5.20 peak sun hours a day on flat ground.
−1%solar energy a year compared with the average place in Peru: 1,588 against 1,605 kWh per kWp.
±0 mindaylight on the longest day, compared with Lima: 12 h 50 min against 12 h 50 min.
11°best year-round tilt here; across Peru it runs from 3° in Tumbes to 19° in Arequipa.
Of the 136 places in Peru, Ciudad Satelite and one other place get the most sun (6.60 peak sun hours a day) and La Peca the least (4.16); San Isidro ranks joint 73rd. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.39 kWh a day here, against 1.33 kWh on average in Peru. The shortest day lasts 11 h 25 min, ±0 min compared with Lima.
Solar forecast for San Isidro, 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 Isidro
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A free, live card for San Isidro: 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.