Solar ROI Calculator
Calculate your solar savings in seconds
Estimate your ideal system size, annual savings, payback period and 20-year return with a simple interactive solar calculator.
- Instant estimate
- Clear financial breakdown
- 20-year outlook
20-Year Net Savings
PROJECTION€29.5K
Payback Period
4.2 years
Recommended System
6.5 kW
Projected savings · 20 years
How it works
A clearer way to evaluate solar
- STEP 1
Add your energy costs
Enter your average electricity bill and current electricity price.
- STEP 2
Shape your solar setup
Choose your solar potential and adjust the recommended system size.
- STEP 3
See your return
Review projected production, savings, payback and long-term ROI.
Solar calculator
Build your solar estimate
Adjust a few simple inputs to see how solar could perform for your home.
Your average electricity cost per month.
Use the average price shown on your electricity bill.
Approx. 1,350 kWh of annual production per installed kW.
Estimated installed cost before subsidies or financing.
System size
6.5 kW
Live estimate
6.5 kW
Recommended solar system
8,775 kWh
Annual production
€7,800
Estimated investment
86%
Energy coverage
Estimated payback: 4.2 years
Your Solar Analysis
Your solar investment could return €29.5K over 20 years
Based on your energy use, solar potential and selected installation assumptions.
20-Year Net Savings
Strong long-term return€29.5K
Estimated savings after recovering your installation cost.
6.5 kW
Recommended System
Sized for your estimated energy use.
€1,865
Annual Savings
Estimated electricity cost avoided each year.
4.2 years
Payback Period
Estimated time to recover your investment.
378%
20-Year ROI
Estimated return relative to installation cost.
Investment overview
- €7,800
- Estimated Installation Cost
- €37,294
- 20-Year Gross Savings
- €29,494
- 20-Year Net Savings
€7.8K
investment
€29.5K
net gain over 20 years
How your savings grow over time
See when your solar investment pays for itself and how savings accumulate over 20 years.
Break-even — Year 4.2
Your energy picture
Compare your estimated annual electricity demand with solar production and usable solar energy.
- Annual consumption8,640 kWh
- Solar production8,775 kWh
- Usable solar energy7,459 kWh
86%
Estimated Energy Coverage
Estimated share of your annual electricity use covered by usable solar generation.
SOLVIA Recommendation
A 6.5 kW system is a strong fit for your current energy profile.
It offers a balanced combination of solar production, upfront investment and long-term savings under your selected assumptions.
- 4.2 yr payback
- 86% coverage
- €29.5K net savings
Try adjusting system size, solar potential or installation cost to compare different scenarios.
Ready to explore another solar scenario?
Adjust your assumptions and instantly compare how different system sizes and costs affect your return.