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Solar Savings Calculator
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This Solar Savings Calculator estimates how long a solar installation takes to pay for itself and how much it could save over its typical 25-year lifespan, based on the system cost, your current monthly electricity bill, the percentage of that bill you expect solar to offset, and any upfront tax credit or incentive. Enter your numbers to see estimated monthly and annual savings, the payback period in years, and net lifetime savings after the initial investment. It's a planning estimate, not a substitute for a detailed quote from a solar installer who can account for your specific roof, location, and utility rate structure. Everything runs locally in your browser. Scroll down to enter your numbers.
Features
- Estimates payback period in years
- Calculates monthly, annual, and 25-year lifetime savings
- Accounts for tax credits or incentives
- Instant recalculation as you adjust inputs
Why use this solar savings calculator?
- Quick financial estimate before requesting a formal quote
- No manual payback math required
- Fully private — no financial details are uploaded
- Free with unlimited use
Frequently asked questions
What bill offset percentage should I use?
90% is a common planning estimate accounting for system losses and any months where usage exceeds production; a professionally sized system may offset closer to 100%, while a smaller system offsets less.
Does this include financing costs?
No, this assumes the system cost is paid outright (or net of incentives); if financing with a loan, add the loan's interest cost to get a more accurate net savings figure.
Why use 25 years for lifetime savings?
Most solar panels carry 25-year performance warranties, making it a standard reference period for lifetime savings estimates, even though panels often continue producing (at reduced output) beyond that.
Does this account for electricity rate increases over time?
No, it assumes a flat electricity bill throughout the period; if rates rise over time (historically common), actual savings would likely be higher than this estimate.
Is this financial advice?
No, results are for general planning purposes only; get a detailed quote from a solar installer for site-specific figures.