PV Calculator: Estimate the Photovoltaic Yield for Your Prefabricated House

Enter system size, roof orientation and federal state to get, within seconds, a simplified model calculation of annual yield, self-consumption savings and a rough payback period. All rates and prices are as of 2026.

Your inputs

System size: 8 kWp

3 kWp20 kWp

Roof orientation

Optimal orientation, highest annual yield.A simplified factor applied to the south-facing yield. South 100%, east-west 85%, north 65%. As of 2026.

Federal state

Specific yield: 1,120 kWh/kWp (south)Averaged specific annual yield per kWp with a south orientation and optimal tilt. Simplified model values, As of 2026.

Self-consumption share: 35%

10%80%

The share of the solar electricity that you consume yourself. A battery storage unit increases this value.

Electricity price 35 ct/kWh, feed-in tariff 7.9 ct/kWh, investment €1,500/kWp — simplified model assumptions, As of 2026.

Estimated annual yield

8,960 kWh

Bayern, South, 8 kWp

Self-consumption saving / year€1,0983,136 kWh used yourself

Feed-in tariff / year€4605,824 kWh fed into the grid

Economic benefit / year€1,558

Investment (rough)€12,000

Rough payback periodInvestment divided by the annual benefit. Calculated without interest, price increases, maintenance and degradation — therefore only a rough orientation. As of 2026.7.7 years

Important note

This calculation is a simplified model calculation (As of 2026) and serves only as an initial orientation. It takes into account neither shading, roof tilt in detail, storage, maintenance, price increases, nor the specific tax situation. It does not replace professional planning.

Your PV model calculation as a PDF

We send you the PDF and you can also download it directly.

More on the topic: solar system for the prefabricated house and photovoltaics in the prefabricated house guide.

Frequently Asked Questions About the PV Calculator

How much electricity does a photovoltaic system on a prefabricated house generate?

As a rough rule of thumb, a system in Germany produces between about 900 kWh in the north and around 1,150 kWh in the south per year for each installed kilowatt-peak (south-facing roof, good pitch). An 8 kWp system therefore generates between roughly 7,200 and 9,200 kWh per year, depending on location. East-west roofs deliver slightly less, but spread the generation more evenly across the day. All figures are simplified model values, as of 2026.

How does self-consumption affect the economics?

Every kilowatt-hour you consume yourself replaces expensive grid electricity (model assumption 35 ct/kWh, as of 2026) and is therefore far more valuable than electricity fed into the grid, which in 2026 is remunerated at around 8 ct/kWh. A higher self-consumption share noticeably improves the economics. Without a battery storage system, self-consumption in a single-family home is often between 25 and 35 percent, and considerably higher with storage.

How quickly does a PV system pay for itself?

The rough payback period is the investment divided by the annual benefit from self-consumption and feed-in. With a model assumption of around 1,500 euros per kWp and good yield conditions, it often falls within the range of ten to fourteen years. The figure is deliberately calculated in a simplified way, without interest, price increases, maintenance and module degradation. This is a simplified model calculation.

Does this calculator replace professional planning?

No. The quick calculator provides an initial orientation based on simplified model assumptions (as of 2026). Shading, the specific roof pitch and shape, storage sizing, maintenance and your individual tax situation are not taken into account. A reliable design requires professional planning by a solar installer (Solarteur).