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Photovoltaic Calculator — PV Profitability

Check whether a photovoltaic system pays off. Enter the system power and cost — the calculator works out annual energy output, savings and payback time.

Reviewed byRedakcja Liczbnik
Calculator
kWh
kWp
PLN
PLN/kWh
Solar PV profitabilityPayback period (years)10.22
Annual savings (PLN)
2,251.5
Annual energy production (kWh)
5,700
Annual rate of return (%)
9.79

How we calculate PV profitability

Output = power [kWp] x 950-1050 kWh/kWp (Poland). Savings = output x price per kWh. Payback time = cost / annual savings.

Example: 6 kWp system, cost 30,000 PLN

Output: about 6,000 kWh/year. Savings: 4,800 PLN/year. Payback time: about 6.3 years.

Frequently asked questions

How is annual output calculated?

Output = installed power in kWp x 950-1050 kWh/kWp typical for Poland.

How is payback time worked out?

Payback = system cost divided by annual savings on electricity.

What affects PV output?

Location, roof orientation, tilt and shading all change the real annual output.

Does the roof direction matter?

Yes, south-facing roofs produce most; east-west splits the output across the day.

Are subsidies included?

No, the base calculation excludes grants; subsidies would shorten the payback time.

Is the result binding?

No, it is indicative. A site assessment gives precise figures.

Indicative result

Indicative result. Actual output depends on location, roof orientation and shading.

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