kabelquerschnitt-berechnen.de

Photovoltaics • Profitability • Payback

Oblicz okres zwrotu PV

Roughly calculate after how many years a photovoltaic system can pay for itself.

Wartości obliczeń

Uwaga: Ten kalkulator podaje jedynie techniczne oszacowanie. W instalacjach elektrycznych należy dodatkowo sprawdzić normy, środki ochrony, sposób ułożenia, temperaturę otoczenia, grupowanie, zabezpieczenia i dane producenta.

Zastosowany wzór

Annual benefit = self-consumption × electricity price + grid feed-in × tariff − operating costs

Payback period = investment ÷ annual benefit

The calculator uses a simple static payback calculation without financing, tax or price increases.

Najczęściej zadawane pytania

Is the payback period guaranteed?

No. It depends on actual yield, consumption behavior, electricity price, feed-in tariff, maintenance and financing.

Why is self-consumption important?

Self-consumed solar power replaces expensive grid electricity and often improves profitability.

What is missing from this simple calculation?

Financing costs, taxes, degradation, repairs, insurance and price changes are not considered in detail.

Practical guidance

Oblicz simple PV payback with transparent assumptions

Simple payback divides investment by annual benefit. It is a first comparison, not a full discounted cash-flow model.

Input values explained

Investment cost
Use the actual total cost including installation and necessary ancillary work, less confirmed grants or rebates.
Annual yield
Use a realistic annual output for the complete system. Forecast quality, shading and age-related degradation affect this value.
Self-consumption share
This is the share of generated solar energy used on site at the same time. It is not the same as the household's self-sufficiency ratio.
Energy price
Use your tariff's energy charge in cents per kWh. Standing charges, metering fees and future price changes are excluded.
Feed-in tariff
Enter the payment applicable to each exported kWh. Rate and duration depend on the specific installation and rules.
Annual operating costs
Include expected recurring costs such as insurance, maintenance or metering. Irregular replacement costs need a separate allowance.

Example: €15,000 and 9,500 kWh

Assume 35% self-consumption, €0.35/kWh retail price, €0.08/kWh export tariff and €150 annual costs.

3,325 kWh × €0.35 + 6,175 kWh × €0.08 − €150 = €1,507.75; €15,000 ÷ €1,507.75 ≈ 9.95 years

Simple payback is about ten years if every assumption remains constant. This is not a guaranteed return.

Distinguish payback from investment return

A full analysis includes timing of cash flows, finance, degradation, replacements and price changes.

Calculation limits

  • Tax, finance, inverter replacement, degradation and residual value are excluded.
  • Energy price, self-consumption and yield are held constant for the full period.