Solar ROI Rechner — Formel
## How to Calculate Solar ROI
Solar ROI measures the total financial return over the system lifetime.
### Formula
**Net Cost = System Cost * (1 - Tax Credit %)**
**Lifetime Savings = Annual Savings * Lifespan**
**ROI = (Lifetime Savings - Net Cost) / Net Cost * 100**
Most solar panels are warranted for 25 years and can produce electricity for 30+ years with gradual degradation.
Solar ROI measures the total financial return over the system lifetime.
### Formula
**Net Cost = System Cost * (1 - Tax Credit %)**
**Lifetime Savings = Annual Savings * Lifespan**
**ROI = (Lifetime Savings - Net Cost) / Net Cost * 100**
Most solar panels are warranted for 25 years and can produce electricity for 30+ years with gradual degradation.
Lösungsbeispiel
A $20,000 system with 30% tax credit, $1,800/year savings over 25 years.
- Net cost: $20,000 * 0.70 = $14,000
- Lifetime savings: $1,800 * 25 = $45,000
- Net profit: $45,000 - $14,000 = $31,000
- Total ROI: $31,000 / $14,000 * 100 = 221.4%
- Annual ROI: 221.4 / 25 = 8.9%/year