Solar Panel Payback & ROI Calculator 2026 (DE / AT / CH)
Calculate annual electricity savings, feed-in revenue, and payback time using official EU-PVGIS radiation data for Germany, Austria, and Switzerland.
- Stromkosten-Ersparnis (32 ct/kWh)+ 1.123 €
- Einspeiseerlös (Ø 7,70 ct/kWh)+ 561 €
- Kalkulatorische Rücklage Betrieb/Versicherung− 160 €
Formula: Annual Solar PV Financial Benefit & Payback Period
Annual Net Benefit = (Self-Consumed kWh × Electricity Price) + (Grid Export kWh × Feed-in Tariff) − Annual O&M
Payback Period (Years) = Net Turnkey Investment (after Grant) ÷ Annual Net BenefitEvery kilowatt-hour of solar electricity used directly in your home replaces expensive retail grid power (e.g., €0.32/kWh in Germany, €0.28/kWh in Austria, or CHF 0.29/kWh in Switzerland), while surplus power exported to the grid earns the statutory feed-in tariff (DE EEG 7.70 ct/kWh up to 10 kWp, AT OeMAG, CH local utility rate).
Worked Example: 10 kWp Solar System + 8 kWh Battery (2026)
A 10 kWp system generating 9,800 kWh/year with a 4,500 kWh household consumption and an 8 kWh battery achieves ~68% self-consumption (3,060 kWh saved × €0.32 = €979/yr) plus 6,740 kWh exported at 7.70 ct/kWh (€519/yr). After €160/yr operating reserve, net annual savings reach €1,338/yr—paying back a €15,500 turnkey system in ~11.6 years.
How to Calculate Solar Panel Payback & ROI (DE / AT / CH)
Step-by-step calculation using official EU-PVGIS solar radiation data and 2026 feed-in tariffs.
- 1. Select Country (DE, AT, CH) & Postal Code: Choose Germany, Austria, or Switzerland and enter your postal code to load official EU-PVGIS solar irradiation data.
- 2. Configure System Size (kWp), Roof Orientation & Battery: Set your planned PV capacity in kWp, roof azimuth/tilt, and optional battery storage size.
- 3. Enter Annual Power Consumption & Turnkey Cost: Input your annual household electricity usage, retail tariff, and turnkey installation quote.
- 4. Review Payback Period, 20-Year Surplus & Grants: Inspect your self-consumption share, feed-in revenue, upfront rebates (AT EAG / CH Pronovo KLEIV), and amortization timeline.
2026 Solar PV System Benchmarks (Germany 0% VAT, Austria EAG, Switzerland Pronovo)
| System Size | Annual Solar Yield | Recommended Battery | Turnkey Cost Range | Annual Net Benefit | Typical Payback |
|---|---|---|---|---|---|
| 5 kWp (Townhouse) | 4,600 – 5,200 kWh | None / 5 kWh | €7,500 – €10,500 | €720 – €940 / yr | 8.5 – 11.5 yrs |
| 8 kWp (Family Home) | 7,400 – 8,400 kWh | 5 – 8 kWh | €10,500 – €14,200 | €1,050 – €1,280 / yr | 9.0 – 11.5 yrs |
| 10 kWp (Home + EV/HP) | 9,200 – 10,600 kWh | 8 – 10 kWh | €11,800 – €16,500 | €1,250 – €1,580 / yr | 8.5 – 11.5 yrs |
| 15 kWp (Large Roof) | 13,800 – 15,900 kWh | 10 – 12 kWh | €16,500 – €22,000 | €1,650 – €2,150 / yr | 8.5 – 11.0 yrs |
Based on EU-PVGIS SARAH3 radiation data and 2026 statutory feed-in rules.
Frequently Asked Questions (FAQ): Solar Payback Calculator
What is the German EEG feed-in tariff in 2026?
For rooftop solar systems commissioned between August 1, 2026 and January 31, 2027, the partial feed-in tariff (Überschusseinspeisung) is 7.70 ct/kWh up to 10 kWp and 6.66 ct/kWh for the 10–40 kWp tier. Full feed-in (Volleinspeisung) pays 12.22 ct/kWh up to 10 kWp and 10.24 ct/kWh for 10–40 kWp, locked in for 20 years.
Is solar PV VAT-free in Germany?
Yes. Under § 12 (3) UStG, residential solar PV systems up to 30 kWp and co-installed battery storage benefit from a 0% VAT rate (Nullsteuersatz) in Germany.
Related Calculators & Formula Documentation
Calculate your exact solar PV payback period, self-consumption ratio, and feed-in revenue across Germany, Austria, and Switzerland.