Urban Municipality of Ptuj · Slovenia · 46.42° N · 15.87° E
Solar position in Ptuj
Sun position, daylight and the best solar panel angle for Ptuj — computed for 46.42° N, 15.87° E, 237 m above sea level.
The sun right now
Sun in Ptuj today
Saturday, 24 October 2026 · local time UTC+2
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:45 | sun 18° below horizon |
| Nautical dawn | 06:20 | 12° below |
| Civil dawn | 06:55 | 6° below |
| Sunrise | 07:26 | 106° ESE |
| Golden hour ends | 08:08 | sun 6° up |
| Solar noon | 12:40 | 31.8° high |
| Golden hour starts | 17:12 | sun 6° up |
| Sunset | 17:54 | 253° WSW |
| Civil dusk | 18:25 | 6° below |
| Nautical dusk | 19:00 | 12° below |
| Astronomical dusk | 19:35 | 18° below |
| Day length | 10 h 28 min | |
Sun path diagram for Ptuj
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 67.0° at solar noon in Ptuj; on the December solstice only 20.2°. Sunrise swings from 54° NE in June to 124° SE in December — a 70° 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 | 07:31 | 12:08 | 16:44 | 9 h 13 min | 23.8° |
| February | 06:50 | 12:10 | 17:30 | 10 h 40 min | 33.1° |
| March | 05:57 | 12:03 | 18:10 | 12 h 12 min | 43.9° |
| April | 05:59 | 12:55 | 19:52 | 13 h 53 min | 55.5° |
| May | 05:16 | 12:53 | 20:30 | 15 h 14 min | 63.8° |
| June | 05:03 | 12:58 | 20:52 | 15 h 49 min | 67.0° |
| July | 05:24 | 13:02 | 20:40 | 15 h 15 min | 64.0° |
| August | 06:02 | 12:59 | 19:55 | 13 h 53 min | 55.6° |
| September | 06:41 | 12:49 | 18:56 | 12 h 15 min | 44.2° |
| October | 07:22 | 12:40 | 17:59 | 10 h 38 min | 32.8° |
| November | 07:06 | 11:42 | 16:17 | 9 h 12 min | 23.7° |
| December | 07:37 | 11:54 | 16:12 | 8 h 35 min | 20.2° |
A year of daylight in Ptuj
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 Ptuj
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
37°collects the most energy over a year: 1259 kWh per kWp.
71°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° | 1046 | 83% | 0.79 | 6.1× |
| 15° | 1182 | 94% | 1.20 | 4.1× |
| 30° | 1251 | 99% | 1.54 | 3.1× |
| 37° year-round best | 1259 | 100% | 1.67 | 2.8× |
| 45° | 1249 | 99% | 1.79 | 2.5× |
| 46° = latitude | 1246 | 99% | 1.80 | 2.5× |
| 60° | 1177 | 93% | 1.94 | 2.0× |
| 70° | 1093 | 87% | 1.97 | 1.8× |
| 71° off-grid best | 1083 | 86% | 1.97 | 1.8× |
| 90° | 851 | 68% | 1.87 | 1.5× |
A fixed array in Ptuj produces the most over a year at 37°. The design month for an off-grid system is December: at 71° it makes 1.97 kWh per kWp a day, 18% more than at 37°, and costs 14% of the yearly total. Why steep panels win winter.
Off-grid solar in Ptuj at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 37° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 37° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.28 | 2.58 | 2.33 | 2.02 | -1.1 °C |
| February | 2.08 | 3.15 | 2.83 | 2.74 | 0.5 °C |
| March | 3.27 | 3.89 | 3.44 | 3.68 | 5.0 °C |
| April | 4.47 | 4.03 | 3.48 | 4.24 | 10.4 °C |
| May | 5.37 | 3.90 | 3.30 | 4.47 | 15.2 °C |
| June | 5.92 | 3.86 | 3.20 | 4.60 | 19.7 °C |
| July | 5.97 | 4.03 | 3.32 | 4.70 | 22.0 °C |
| August | 5.17 | 4.23 | 3.51 | 4.49 | 21.5 °C |
| September | 3.70 | 3.95 | 3.35 | 3.76 | 15.9 °C |
| October | 2.47 | 3.52 | 3.05 | 3.04 | 10.6 °C |
| November | 1.35 | 2.41 | 2.12 | 1.94 | 5.2 °C |
| December snow | 1.01 | 2.19 | 1.97 | 1.67 | 0.1 °C |
| Year | 3.51 avg | 3.48 avg | 1093 kWh | 1259 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 600 Wp of panels at 70°, versus 710 Wp at 37°. The steep array is 15% smaller for the same winter. Size your own system.
Row spacing in Ptuj
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.
6.8 mrow pitch at 70°
5.5 mrow pitch at 37°
How Ptuj compares in Slovenia
Against the other 8 places in Slovenia with climate data, for a fixed array at its best angle.
4thof 9 places in Slovenia for sunshine, shared: 3.51 peak sun hours a day on flat ground.
−1%solar energy a year compared with the average place in Slovenia: 1,259 against 1,273 kWh per kWp.
+3 mindaylight on the longest day, compared with Ljubljana: 15 h 49 min against 15 h 46 min.
37°best year-round tilt here; across Slovenia it runs from 36° in Koper to 38° in Maribor.
Of the 9 places in Slovenia, Koper gets the most sun (3.77 peak sun hours a day) and Maribor the least (3.47); Ptuj ranks joint 4th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.97 kWh a day here, against 2.10 kWh on average in Slovenia. The shortest day lasts 8 h 35 min, −3 min compared with Ljubljana.
Solar forecast for Ptuj, 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 Ptuj
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Places near Ptuj
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A free, live card for Ptuj: 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.