Electricity Cost Calculator
Calculate how much electricity any appliance costs to run. Enter the wattage, daily usage hours, and price per kWh to get daily, monthly, and annual costs.
Energy Calculators
Current for 2026How we verify data: Methodology →
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.
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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. Actual output depends on location, roof orientation and shading.
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Result10.22zwrotInwestycji
- oszczednosciRoczne
- 2,251.5
- produkcjaRocznaKwh
- 5,700
- stopZwrotuRoczna
- 9.79