EU Solar PV Return on Investment Calculator 2026
Calculate payback period, ROI of 25 years and NPV for your solar plant in 8 EU countries (IT, DE, FR, ES, NL, UK, PL, AT). Updated incentives and emission tariffs as per 2026 data from PVGIS JRC production.
Plant Parameters
ROI Results
Payback Chart - Cumulative Cash Flow
Show year-by-year data table
| Year | Production kW/h (or Production kilowatt-hours) | Save money | Cumulative response: € | Cumulative cash flow (€) |
|---|---|---|---|---|
| 1 | 5,934 | 852 | 852 | -4,908 |
| 2 | 5,904 | 847 | 1,699 | -4,061 |
| 3 | 5,875 | 843 | 2,542 | -3,218 |
| 4 | 5,845 | 839 | 3,381 | -2,379 |
| 5 | 5,816 | 835 | 4,215 | -1,545 |
| 6 | 5,787 | 830 | 5,046 | -714 |
| 7 | 5,758 | 826 | 5,872 | 112 |
| 8 | 5,729 | 822 | 6,694 | 934 |
| 9 | 5,701 | 818 | 7,512 | 1,752 |
| 10 | 5,672 | 814 | 8,326 | 2,566 |
| 11 | 5,644 | 810 | 9,136 | 3,376 |
| 12 | 5,616 | 806 | 9,942 | 4,182 |
| 13 | 5,588 | 802 | 10,744 | 4,984 |
| 14 | 5,560 | 798 | 11,542 | 5,782 |
| 15 | 5,532 | 794 | 12,335 | 6,575 |
| 16 | 5,504 | 790 | 13,125 | 7,365 |
| 17 | 5,477 | 786 | 13,911 | 8,151 |
| 18 | 5,449 | 782 | 14,693 | 8,933 |
| 19 | 5,422 | 778 | 15,471 | 9,711 |
| 20 | 5,395 | 774 | 16,245 | 10,485 |
| 21 | 5,368 | 770 | 17,016 | 11,256 |
| 22 | 5,341 | 766 | 17,782 | 12,022 |
| 23 | 5,314 | 763 | 18,545 | 12,785 |
| 24 | 5,288 | 759 | 19,304 | 13,544 |
| 25 | 5,261 | 755 | 20,059 | 14,299 |
Come utilizzare
Seleziona il paese e la dimensione impianto
Scegli il paese EU dove installi i pannelli e inserisci la potenza in kWp. Un impianto residenziale tipico è 3-6 kWp (10-20 pannelli da 400W). Il tool usa la produzione media nazionale (kWh/kWp).
Inserisci il costo e il prezzo elettricità
Il costo tipico 2026 è €1.200-1.800/kWp chiavi in mano (pannelli + inverter + installazione). Il prezzo elettricità è pre-compilato con la media Eurostat per il paese; puoi personalizzarlo con il tuo contratto.
Stima la quota di autoconsumo
L'autoconsumo è la % di energia solare usata direttamente (non immessa in rete). Senza batteria: 25-35%. Con batteria: 60-80%. L'energia eccedente viene immessa in rete alla tariffa incentivante del paese.
Analizza ROI, payback e NPV
Il grafico mostra il cash-flow cumulato: sotto lo zero significa investimento non ancora recuperato. La linea verticale indica il payback. ROI 25 anni e NPV a 4% misurano la convenienza finanziaria complessiva.
Domande frequenti
How is annual production calculated?
Production = kWp × kWh/kWp/year × (1 - 14% system losses). System losses include inverter efficiency, cables, reflection, and temperature. Each year production decreases by 0.5% (standard panel degradation IEC 61215). The kWh/kWp/year value is the mean PVGIS JRC for the country.
What does the network entry fee cover?
Feed-in tariff is the payment received for every kWh sold to the grid. For IT: GSE Withdrawal Dedicated ~0.085 €/kWh. For DE: EEG 2026 ~0.082 €/kWh. For UK: Smart Export Guarantee ~0.18 €/kWh. These tariffs are subject to annual review.
How do incentives work for countries?
No direct tax incentives 2026.
Why is the ROI different between countries with more sunlight?
ROI depends on three factors: solar production (sun), electricity price (savings per kWh self-consumed), and incentive tariff (compensation for injection). Spain has more sun but lower electricity prices; the UK has less sun but the highest SEG EU tariff (0.18 €/kWh). The NPV normalizes these differences.
Does the calculation take into account battery storage?
No. The tool does not model battery storage systems. Without a battery, typical self-consumption is 25-35%. With a battery, it increases to 60-80%, significantly improving ROI. Manually insert a higher % autoconsumption if you plan to install a battery.
What's not modeled (edge case)?
Not considered due to: (1) suboptimal orientation (East/West reduction -10-20%); (2) shading from trees/buildings (-5-15%); (3) future electricity price growth (+2-4%/year increase in real ROI); (4) O&M costs (maintenance ~€100-150/year); (5) inverter replacement year 12-15 (~€800-1.500).