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Calculateur de ROI Solaire.
Calculez la periode de rentabilite et les economies de vos panneaux solaires
Cette calculatrice n'est pas encore entièrement traduite ; une partie du texte s'affiche en anglais.
Saisissez vos valeurs
Les résultats se mettent à jour pendant la saisie.
Energy Production
Standard systems produce 1,200-1,600 kWh per kW annually depending on location.
Sunlight Exposure
Roof orientation and shading significantly impact actual energy yield.
Maintenance Costs
Modern panels require minimal maintenance, but inverters may need replacement after 10-15 years.
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Cite this calculator
Canonical URL: https://mathify.one/fr/sustainability/solar-roi
Cite as: Mathify. (2026). Calculateur de ROI Solaire. https://mathify.one/fr/sustainability/solar-roi
Use Cases
Evaluate Solar Investment for Home
Determine if solar panels are worth the upfront cost by estimating payback period and long-term savings based on your system size, local electricity rates, and available incentives.
Example: A 6 kW system at $2.50/W with $3,000 incentives and a $0.15/kWh rate.
Compare Solar Quotes
Use the calculator to compare different system sizes, costs per watt, and incentive amounts to see which option yields the best ROI and shortest payback.
Example: Compare a 5 kW system at $3.00/W vs. a 6 kW system at $2.80/W.
Frequently Asked Questions
- How does the solar panel ROI calculator work?
- The calculator uses your system size (kW), cost per watt, incentives, annual production (kWh), electricity rate, and rate increase to estimate annual savings, payback period, ROI, and 25-year savings. It assumes a 25-year system life and accounts for rising electricity rates.
- What is a good payback period for solar panels?
- A typical payback period is 6-10 years. The calculator shows your estimated payback based on your inputs. A shorter payback means faster return on investment.
- How are 25-year savings calculated?
- The calculator multiplies your annual production by your electricity rate, then applies the rate increase each year to project future savings. It sums these over 25 years and subtracts your net cost (system cost minus incentives) to estimate total savings.
Tips & Common Mistakes
Tips
- Enter your actual system cost (after incentives) for accurate ROI.
- Use your local electricity rate and expected annual rate increase for realistic savings.
- Annual production depends on your location and roof orientation; check your utility bill or solar estimate.
- Consider maintenance costs and inverter replacement when evaluating long-term savings.
Common Mistakes to Avoid
- Forgetting to subtract incentives from the total cost, which overstates the payback period.
- Using a flat electricity rate without accounting for rate increases, underestimating savings.
- Entering annual production in kWh instead of monthly, leading to incorrect savings.
Last updated: August 13, 2026