Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 51.7 kWh from the 10 kWp reference system, with a likely range of 45.2 kWh–57.9 kWh. It changes with the next weather forecast.
Romania · 10 kWp reference system
Constanța solar forecast and PV yield
Photo: Andymxm,CC BY 4.0. Cropped, resized and converted to WebP by GridPassport.
Forecast target: . Any “tomorrow” label on this page refers to this dated target.
- Tomorrow's forecast
- 51.7 kWh 10 kWp reference system
- Typical annual output
- 13,180 kWh 10 kWp reference system
- Typical specific yield
- 1,318 kWh/kWp Per year
Tuesday, September 1, 2026
About 51.7 kWh tomorrow
For a standard 10 kWp south-facing system in Constanța, GridPassport estimates 51.7 kWh on Tuesday, September 1, 2026, with a likely range of 45.2-57.9 kWh. The strongest production window is expected at 12:00-16:00 local time.
Updated Aug 31, 2026, 02:01 AM GMT+3 · fresh snapshot- Likely range
- 45.2-57.9 kWh
- Strongest window
- 12:00-16:00
- Confidence
- high
How to read and use the data
Constanța solar forecast: daily weather versus long-term PV yield
The daily and annual figures answer different questions. Use the dated forecast to plan tomorrow, and the PVGIS specific yield to compare locations or estimate a typical year.
Multi-year climate baseline
PVGIS specific yield
Constanța's PVGIS specific yield is about 1,318 kWh/kWp per year. It is a multi-year climate benchmark, not a prediction for tomorrow or for this calendar year. In the PVGIS profile, August is typically the strongest month and December the weakest.
3, 5 and 10 kWp reference systems
Scale the same assumptions to your system size
SystemTomorrow estimate (likely range)PVGIS typical year
3 kWpTomorrow estimate (likely range)15.5 kWh13.6 kWh–17.4 kWhPVGIS typical year3,954 kWh/year
5 kWpTomorrow estimate (likely range)25.9 kWh22.6 kWh–28.9 kWhPVGIS typical year6,590 kWh/year
10 kWpTomorrow estimate (likely range)51.7 kWh45.2 kWh–57.9 kWhPVGIS typical year13,180 kWh/year
Linear reference scaling only: south-facing, 35° tilt and 14% system losses. It does not resize inverter clipping, shade or local roof constraints.
From forecast to a household plan
Battery, EV, heat pump and flexible loads
Treat the forecast as a gross solar-energy budget before household base load and conversion losses. The numbers support scheduling; they do not guarantee surplus.
Battery
Keep room for the solar window
Use 12:00-16:00 as the first candidate charging window. Battery state of charge, reserve settings and inverter limits still decide how much can be stored.
EV
Compare the charge with the 5 kWp budget
The scaled 5 kWp estimate is 25.9 kWh before household use. Compare the remainder after base load with the planned EV charge and stagger charging if needed.
Heat pump
Shift only flexible thermal demand
If comfort controls allow it, place discretionary hot-water heating or pre-heating inside 12:00-16:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 15.5 kWh for the day before household use. Run flexible loads sequentially during the strongest hours rather than assuming all forecast energy is simultaneous power.
Local questions
Solar forecast FAQ
How much could a 5 kWp solar system produce tomorrow in Constanța?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 25.9 kWh for Tuesday, September 1, 2026, with a scaled likely range of 22.6 kWh–28.9 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,318 kWh/kWp mean for Constanța?
It means the PVGIS multi-year profile produces about 1,318 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 6,590 kWh in a typical year before site-specific adjustments.
Is the Constanța forecast the same as the PVGIS annual estimate?
No. Tomorrow's forecast uses dated weather and an uncertainty band for one day. The PVGIS figure is a multi-year climate-based specific yield used for typical monthly and annual comparisons.
When should a battery, EV or heat pump use solar in Constanța?
Start with 12:00-16:00, then check household base load, battery headroom, EV energy required and heat-pump safety or comfort constraints. The forecast estimates daily energy, not guaranteed instantaneous surplus.
Typical year
Solar production month by month in Constanța
A standard 10 kWp system produces about 13,180 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
624Jan
707Feb
1065Mar
1282Apr
1466May
1460Jun
1581Jul
1591Aug
1283Sep
961Oct
608Nov
552Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Constanța's solar profile different?The typical annual yield is about 1,318 kWh per installed kWp, ranking Constanța #1 of 6 modelled locations in Romania. That is 7% above the median of the 6 Romania locations in this dataset. August is typically the strongest month and December the weakest; the stronger month produces about 2.9 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output624 kWhDaily average20.1 kWh/dayYear-to-year variation±110 kWh
MonthFebruaryMonthly output707 kWhDaily average25.3 kWh/dayYear-to-year variation±149 kWh
MonthMarchMonthly output1,065 kWhDaily average34.3 kWh/dayYear-to-year variation±135 kWh
MonthAprilMonthly output1,282 kWhDaily average42.7 kWh/dayYear-to-year variation±165 kWh
MonthMayMonthly output1,466 kWhDaily average47.3 kWh/dayYear-to-year variation±93 kWh
MonthJuneMonthly output1,460 kWhDaily average48.7 kWh/dayYear-to-year variation±105 kWh
MonthJulyMonthly output1,581 kWhDaily average51.0 kWh/dayYear-to-year variation±105 kWh
MonthAugustMonthly output1,591 kWhDaily average51.3 kWh/dayYear-to-year variation±74 kWh
MonthSeptemberMonthly output1,283 kWhDaily average42.8 kWh/dayYear-to-year variation±118 kWh
MonthOctoberMonthly output961 kWhDaily average31.0 kWh/dayYear-to-year variation±179 kWh
MonthNovemberMonthly output608 kWhDaily average20.3 kWh/dayYear-to-year variation±101 kWh
MonthDecemberMonthly output552 kWhDaily average17.8 kWh/dayYear-to-year variation±132 kWh
Nearby solar forecasts
Compare Constanța with nearby cities
Tomorrow, in one email
Get Constanța's solar forecast by email
Tomorrow's expected production, likely range and strongest hours. One useful email each day.
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.
CSV and JSON snapshots are published under CC BY 4.0 with source attribution.