Solar Panel Profitability Calculator

The typical payback period for a residential PV system in Poland is 7–12 years, depending on the system size, installation cost, electricity price and available subsidies. With a "Mój Prąd" grant, payback can drop to 6–9 years.

A well-sized PV system can deliver a return on investment of 200–400% over 25 years, assuming a 5% annual increase in electricity prices. The exact figure depends on the cost of the installation, energy consumption and local solar irradiance.

In Poland, 1 kWp of installed capacity typically produces 850–1,050 kWh of electricity per year, depending on the region and roof orientation. Southern Poland (e.g. Małopolska) achieves higher yields than the north. Our calculator uses a default of 950 kWh/kWp.

The main programmes in 2026 are "Mój Prąd 6.0" (grant up to 7,000 PLN for prosumer systems) and "Czyste Powietrze" (co-financing for heat pumps combined with PV). Some municipalities also offer additional local subsidies. Enter your expected grant in the "subsidy" field to see the impact on payback.

Poland replaced the 1:0.8 net metering system with a net billing scheme for prosumers who connected after 1 April 2022. Under net billing, surplus energy fed into the grid is valued at the hourly market price rather than at a fixed rate, which generally reduces the financial benefit of oversizing the installation.

Rising electricity prices improve the return on a PV investment. If prices rise by 5% per year, the annual savings in year 10 will be about 63% higher than in year 1. Our calculator applies a compounding price growth factor so you can see the impact over the full analysis period.

To cover 4,000 kWh/year of consumption you need approximately 4–5 kWp of installed capacity (assuming 950 kWh/kWp yield). A slightly larger system (5–6 kWp) is often recommended to account for losses and ensure maximum self-consumption.

A home battery increases self-consumption by storing surplus daytime production for evening use, which can improve annual savings by 20–40%. However, batteries add 10,000–20,000 PLN to the upfront cost, so the overall ROI impact depends on the battery lifespan and electricity tariff.

Our calculator provides a reliable estimate based on standard assumptions (950 kWh/kWp yield, chosen price growth rate, flat-rate consumption). For a precise quote, contact a certified installer who can assess your specific roof, shading, and energy profile.

Yes — most crystalline silicon panels degrade at 0.5–0.8% per year. After 25 years, output is typically 80–88% of the rated capacity. Quality panels from reputable manufacturers come with a 25-year linear performance guarantee. Our calculator uses a fixed yield figure; for greater accuracy, you can reduce the kWh/kWp input slightly to account for degradation.