solar payback period calculator
Solar Payback Period Calculator with Incentive and Degradation
Payback period should include both electricity inflation and panel degradation for realistic long-term decisions.
How to calculate using Solar Cost Savings Calculator
- Start with current monthly electricity bill and expected solar offset percent.
- Enter net system cost inputs including incentive and yearly maintenance.
- Use inflation and degradation assumptions for long-term payback projection.
Solar Cost Savings Calculator formula
- Net system cost = gross system cost x (1 - incentive%).
- Annual offset value = monthly bill x 12 x offset%.
- Payback is the year cumulative net savings exceed net system cost.
Worked example
- Example: bill $180/month, 80% offset, system cost $16,000, incentive 30%.
- Net upfront cost = $11,200.
- First-year gross offset value = $1,728 before maintenance.
Accuracy and interpretation notes
- Use conservative assumptions for degradation and maintenance.
- For battery projects, include replacement cycle cost in analysis.
SEO keywords covered in this guide
- solar payback period calculator
- solar savings calculator
- solar payback calculator
- solar roi calculator