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Looking over the city of Cluj-Napoca towards Union Square and St. Michaels Church.

Romania · 10 kWp reference system

Cluj-Napoca solar forecast

Photo: Dennis G. Jarvis, CC BY-SA 2.0. Cropped, resized and converted to WebP by GridPassport.

Wednesday, August 5, 2026

About 55.2 kWh tomorrow

For a standard 10 kWp south-facing system in Cluj-Napoca, GridPassport estimates 55.2 kWh on Wednesday, August 5, 2026, with a likely range of 48.5-60.4 kWh. The strongest production window is expected at 12:00-16:00 local time.

Updated Aug 4, 2026, 09:53 PM GMT+3 · fresh snapshot
Likely range
48.5-60.4 kWh
Strongest window
12:00-16:00
Confidence
high
Forecast my solar output

Typical year

Solar production month by month in Cluj-Napoca

A standard 10 kWp system produces about 12,156 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.

Values are kWh per month. Source: European Commission JRC PVGIS.

What makes Cluj-Napoca's solar profile different? The typical annual yield is about 1,216 kWh per installed kWp, ranking Cluj-Napoca #4 of 6 modelled locations in Romania. That is 2% below the median of the 6 Romania locations in this dataset. July is typically the strongest month and December the weakest; the stronger month produces about 3.4 times as much.

See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuary Monthly output496 kWh Daily average16.0 kWh/day Year-to-year variation±93 kWh
MonthFebruary Monthly output680 kWh Daily average24.3 kWh/day Year-to-year variation±121 kWh
MonthMarch Monthly output1,070 kWh Daily average34.5 kWh/day Year-to-year variation±209 kWh
MonthApril Monthly output1,204 kWh Daily average40.1 kWh/day Year-to-year variation±171 kWh
MonthMay Monthly output1,306 kWh Daily average42.1 kWh/day Year-to-year variation±141 kWh
MonthJune Monthly output1,348 kWh Daily average44.9 kWh/day Year-to-year variation±125 kWh
MonthJuly Monthly output1,419 kWh Daily average45.8 kWh/day Year-to-year variation±110 kWh
MonthAugust Monthly output1,394 kWh Daily average45.0 kWh/day Year-to-year variation±122 kWh
MonthSeptember Monthly output1,183 kWh Daily average39.4 kWh/day Year-to-year variation±157 kWh
MonthOctober Monthly output1,008 kWh Daily average32.5 kWh/day Year-to-year variation±157 kWh
MonthNovember Monthly output630 kWh Daily average21.0 kWh/day Year-to-year variation±125 kWh
MonthDecember Monthly output418 kWh Daily average13.5 kWh/day Year-to-year variation±98 kWh

Nearby solar forecasts

Compare Cluj-Napoca with nearby cities

DebrecenHungary 53.1 kWh BrașovRomania 55.5 kWh TimișoaraRomania 53.7 kWh

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Method and data

Every city uses a 10 kWp system facing south at 35 degrees with 14% system losses. Tomorrow's figure combines hourly weather with GridPassport's PV production and uncertainty model. The monthly profile uses the European Commission JRC PVGIS multi-year climate series. Roof direction, shade, snow, dirt, inverter clipping and local weather can change real output.

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