Photovoltaic Calculator
Calculate the yield and profitability of your solar system. With self-consumption, feed-in tariff and payback period. With current 2026 electricity prices.
Total Cost
€14,000.00
10.0 kWp x €1,400.00
Annual Yield
10,000 kWh
Self-Consumption: 3,000 kWh |Feed-in: 7,000 kWh
Annual Savings
€1,594.60
in the first year
Payback Period
approx. 9.0 years
Profit after 20 Years
€16,421.63
Total Savings: €30,421.63
CO2 Savings (20 Years)
76.3 t
approx. 400 g/kWh electricity mix
Note: This calculation is for guidance only. Actual yields depend on roof pitch, orientation, shading, and other factors. Electricity price changes and maintenance costs are not included. Feed-in tariff according to EEG 2024 for systems up to 10 kWp.
Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
FAQ
Frequently Asked Questions
Is a solar system still worthwhile?
Yes, solar systems typically pay for themselves in 8-12 years. With current electricity prices and falling module costs, the return on investment is 5-8%. Since 2023, there is no VAT on residential systems up to 30 kWp.
How much does a photovoltaic system cost?
A typical residential system (5-10 kWp) costs 8,000-15,000 euros including installation. With a battery storage (5-10 kWh), add another 5,000-10,000 euros. Prices have fallen significantly in recent years.
Which electricity prices are baked into the calculation?
An average household electricity price of about 36 ct/kWh is used (Germany 2026). Actual prices vary by provider and tariff — the calculator allows you to enter your own value.
Guide
Quick Answer
The photovoltaic calculator computes the yield, self-consumption, feed-in tariff and financial viability of a solar system for your roof.
What is the Photovoltaic Calculator?
The photovoltaic calculator computes the yield, self-consumption, feed-in tariff and financial viability of a solar system for your roof.
How does the Photovoltaic Calculator work?
Enter the system capacity, location and roof orientation. The calculator determines the annual yield, self-consumption share and feed-in revenue. The payback period is calculated from investment costs and annual income.
Key Data and Facts
Feed-in tariff 2025 (partial feed-in up to 10 kWp): 8.03 ct/kWh. System costs: 1,200-1,800 euros/kWp. VAT exemption for PV up to 30 kWp. Yield in Germany: 900-1,100 kWh/kWp.
Step-by-Step Guide
How to calculate the economic viability of a PV system step by step: 1. Determine the system size: Measure the usable roof area. About 5-7 m2 are needed per kWp. 2. Estimate the annual yield: In Germany an optimally oriented system generates about 900-1,100 kWh per kWp. Southern Germany is higher than northern Germany. Roof orientation: south is ideal, east/west about 15-20 % less. Roof pitch: 30-35 degrees is optimal. 3. Set the self-consumption share: Without storage about 25-35 %, with battery storage about 50-70 %. 4. Calculate the revenue: Self-consumption: savings = self-consumed kWh x electricity price (about EUR 0.37/kWh). Feed-in: payment = fed-in kWh x feed-in tariff (8.03 ct/kWh for partial feed-in up to 10 kWp). 5. Calculate the costs: Investment about EUR 1,200-1,800 per kWp. Since 2023 there has been no VAT on PV systems up to 30 kWp. Operating costs about 1-2 % of the investment per year. 6. Amortisation: typically 9-14 years.
Calculation Example
10-kWp-Anlage, Standort München, Suedausrichtung: Jahresertrag ca. 10.500 kWh. Eigenverbrauch 30 % (3.150 kWh x 0,37 EUR = 1.166 EUR). Einspeisung 70 % (7.350 kWh x 0,0803 EUR = 590 EUR). Jaehrlicher Ertrag: 1.756 EUR. Investition: 15.000 EUR. Amortisation: ca. 8,5 Jahre.
Sources · E-E-A-T
Official sources
Calculations are based on applicable German laws and official data:
- Bundesministerium für Wirtschaft und Klimaschutz
- Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA)
Full methodology at Methodology.
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