Solar yield
A year’s AC energy from array size, a typical regional yield and one or two roof planes.
Open a calculatorSolar payback
Yearly kilowatt-hours use the same sketch as the yield calculator, including a second plane if you enter one. Energy used on site avoids the purchase price. The surplus is sold at the price you enter, in the manner of net-billing. If you enter yearly use, self-consumption cannot exceed that use, and the page also shows grid import and a rough self-sufficiency share. Payback is net cost (install minus subsidy) divided by first-year savings. The model ignores inflation, degradation and a loan. It is not a bank offer.
kWp
kWh
kWh/kWp
%
%
Simple payback period
10.4
Net cost after subsidy
60,000
Install cost per kWp
6,000 /kWp
Estimated yearly output
9,306 kWh
Yield at this orientation
931 kWh/kWp
First-year saving
5,770
Used on site
2,792 kWh
Sold surplus
6,514 kWh
Still bought from the grid
5,208 kWh
Share of use covered on site
35%
Simple payback period: 10.4
Without storage, 25–35% self-consumption is common in a house. A home battery can raise that share toward half, and the cost. Under net-billing the sale price changes from month to month. Installed cost in recent Polish quotes is often around 6 000 zł per kWp before any grant.
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An educational estimate. Not medical, tax or credit advice.