Solar payback in France (FR)
8 kWp rooftop system at € 12,000 (€ 1500/kWp), self-consumption 60%. Latitude 47° gives ~1155 kWh/kWp/yr.
Payback period
49.6 years
Annual savings: € 242 · Production: 9240 kWh/year
25-year ROI: -50% (net € — vs system cost € 12,000) (net € -5950 vs system cost € 12,000)
Energy + savings breakdown
| Annual production (47° latitude) | 9240 kWh |
| Self-consumed (60%) | 5544 kWh |
| Exported to grid (40%) | 3696 kWh |
| 30-day average price (FR) | € 0.0327 /kWh |
Embed this calculator on your site
Free, attribution-required. Paste this iframe into any blog or news article:
<iframe
src="https://euenergy.live/tools/solar-payback/embed?zone=FR&kwp=8&cost=12000&selfconsumption=60"
width="100%" height="540"
style="border:1px solid #ddd;border-radius:6px"
loading="lazy"
title={t.headline(zone.code, countryName) + " — euenergy"}
></iframe>How it works + caveats
- kWp installed: Latitude-based estimate, accurate within ±15% for residential. PVGIS for serious decisions.
- System cost (€): €1500/kWp default (rough EU residential 2026 average, before subsidies).
- Self-consumption %: Without battery 30%; with smart-home 60%; with battery 80%+.
- Bidding zone: 30-day rolling wholesale average for FR. Real retail higher (taxes + grid fees).
- 25 years assumes panels degrade ~0.5%/yr; inverter typically replaced once around year 12.
See France prices: Browse France →