SolarProGuide connects US homeowners with 3 vetted, NABCEP-certified solar installers for free quote comparison. Call (844) 210-9286 for 3 free quotes in 60 seconds — no obligation, no fees. Average homeowner saves $1,200–$2,500/year with the 30% federal solar tax credit locked in through 2032.
How the Solar Payback Calculator Works
Enter your monthly electric bill and ZIP code to get a personalized estimate in 60 seconds. The calculator uses real 2026 installer pricing, your local sun-hour data (NREL), state incentives, and utility rate escalation to project your savings, payback, and lifetime ROI. When you're ready for real numbers, call (844) 210-9286 — we hand you 3 written quotes from vetted local installers within 48 hours. Free, no obligation.
2026 Solar System Sizes + Costs
| System Size | Gross Cost | After 30% Federal ITC | Annual Bill Savings | Payback |
|---|---|---|---|---|
| 5 kW | $14,000 | $9,800 | $900-1,400 | 7-11 years |
| 7 kW | $19,600 | $13,720 | $1,300-1,900 | 7-11 years |
| 8 kW (typical) | $22,400 | $15,680 | $1,500-2,200 | 7-10 years |
| 10 kW | $28,000 | $19,600 | $1,900-2,700 | 7-11 years |
| 10 kW + Battery | $38,000 | $26,600 | $2,100-3,000 | 9-13 years |
| 12 kW | $33,600 | $23,520 | $2,300-3,300 | 7-10 years |
What Numbers The Calculator Returns
- Recommended system size in kilowatts (kW) based on your electric usage
- Gross system cost — before any tax credit or rebates
- Net cost after 30% federal ITC — direct dollar-for-dollar tax credit
- Monthly + annual bill savings — how much your utility bill drops
- Payback period — years until system pays for itself
- 25-year lifetime savings — cumulative net-positive over system life
- Environmental impact — CO₂ offset (equivalent trees planted / cars off road)
Assumptions Behind The Math
- Panel efficiency: 20-22% (typical Tier-1 monocrystalline)
- System degradation: 0.5%/year (industry standard)
- Utility rate escalation: 3%/year (10-year historical average per EIA)
- Federal ITC: 30% (locked in through 2032 by the Inflation Reduction Act)
- Sun-hour data: NREL PVWatts by ZIP
- Panel warranty: 25 years @ 80%+ output
How to Use Your Estimate
- Run the calculator with your ZIP + last 12 months of electric bill
- Note the recommended system size and net cost after the 30% ITC
- Call (844) 210-9286 or use our form for 3 real installer quotes for your address
- Compare quotes to the calculator estimate — real quotes should land within ±15%
- If any installer's quote is significantly higher, ask them why. Compare on panel brand, inverter, warranty — not just price.
Related Solar Calculators
kWh Calculator
Estimate how many kWh your system will produce annually based on ZIP + panel count.
Payback Calculator
Detailed year-by-year payback breakdown including financing costs.
Tax Credit Calculator
Estimate your federal 30% ITC + state credits + carryforward.
Battery Calculator
Size a battery system for backup during outages or self-consumption.
Net Metering Calculator
Calculate export credits under NEM 1.0, NEM 2.0, and NEM 3.0 rules.
ROI Calculator
25-year ROI factoring in panel degradation and utility rate escalation.