Estimate your panel output based on your location and size your kit.
Combined factor: x{value}. Output = base × orientation × tilt.
Select a city to see the estimated solar production.
A solar installation's output depends on four factors: installed peak power (in kWp), local irradiation, panel orientation and tilt. The calculator uses the European Commission's PVGIS irradiation data to estimate realistic monthly and yearly output, city by city.
A 0.85 loss factor is applied to account for temperature, wiring, inverter efficiency and soiling. This is what separates the panels' theoretical power from the energy actually available at your location.
The calculator also estimates return on investment: by combining the kWh price and the self-consumption rate, it shows how many years the system takes to pay back and the net gain over ten years.
Choose your city
Select your location to load real irradiation from PVGIS data.
Configure your panels
Enter the unit power and number of panels to set the total peak power.
Adjust orientation and tilt
Set azimuth and angle: due south at 30-35 degrees maximizes annual output.
Analyze the results
Review monthly output, the recharge time of a power station, and the estimated return on investment.
About 1000 to 1400 kWh per year per installed kWp, depending on region and orientation. The south produces noticeably more than the north.
Because peak power is measured under ideal conditions. In reality, temperature, cables, inverter and dust reduce output by about 15%.
No. A 45-degree deviation (south-east or south-west) reduces output by only 5 to 8%. Tilt matters almost as much as orientation.
By multiplying self-consumed energy by the avoided kWh price, then comparing against the upfront investment over the system's lifetime.
