Estimate PV system ROI, Payback Period, and 25-Year Total Savings. Considers federal ITC tax credit, state subsidies, and rate increases. Client-side calculation.
Zero Dependencies · Works Offline🔧 System Parameters
Typical residential: 4-10 kW
Equipment + installation. US avg ~$3.0/W
Expected monthly generation
Your current electricity rate
💰 Financial Parameters
30% through 2022-2032
Additional local government incentives
Expected annual electricity rate increase, historical avg 2-3%
Annual panel efficiency loss, typically 0.3-0.8%
📖 Understanding Solar Investment
Residential solar systems typically25years+ year lifespan，Payback Periodapprox.6-10years.federalITCtax credit covers30% of system cost，significantly shortens payback.
Key ROI Factors
- Installation Cost: US average $2.5-$3.5/W. Lower cost = faster payback.
- Local Electricity Rate: Higher rates (e.g., CA $0.30+/kWh) make solar more attractive.
- Sunlight Conditions: Southwest gets 300+ sunny days/year for maximum efficiency.
- Net Metering: Whether you can sell excess power back to the grid.
- Federal/State Incentives: ITC + state rebates can cover 40-50% of costs.
State Solar Friendliness
- Best: CA, AZ, NV - high rates + strong sun
- Good: TX, FL, NM - strong sun + moderate rates
- Average: NY, MA - less sun but high rates + good incentives
- Poor: WA, OR - low sun + low rates
❓ FAQ
How long do solar systems last?
Most panels have 25-30 year performance warranties, typically retaining 80-85% efficiency after 25 years. Inverters last 10-15 years and need mid-life replacement.
Can renters install solar?
Generally no. But consider Community Solar programs — buy or lease shares of nearby solar farms for similar savings.