Solar ROI
Energy Audit
Battery
Incentives
25-Yr Savings
DIY Energy Audit (Quick Assessment)
Solar System Configuration
Battery Storage (Optional)
What Makes This Tool Unique (High Barrier to Copy)
This is the only free web tool combining solar ROI, DIY energy audit, and battery storage analysis with state-level incentive data. Unlike basic calculators, we integrate:
- DSIRE Incentive Database: 2,500+ policies and incentives across 124 energy technologies[reference:4] — the same data used by solar professionals.
- NREL PVWatts Logic: Solar production estimates based on location, orientation, shading, and degradation.
- Net Metering Policies: State-by-state net metering rules affecting ROI.
- Battery ROI: Includes federal ITC eligibility for battery storage (30% credit).
The solar ROI estimator app market is projected to reach $1.2B by 2033[reference:5]. This tool positions you at the forefront.
How Solar ROI Is Calculated
- Gross Cost: System Size (kW) × 1000 × Cost per Watt.
- Federal ITC: 30% of system cost (through 2032).
- State Incentives: Varies — rebates, SRECs, performance payments.
- Annual Savings: Production × Retail Electricity Rate (adjusted for net metering).
- Payback: Net Cost ÷ Annual Savings.
- 25-Year ROI: (Total Savings - Net Cost) ÷ Net Cost × 100%.
Solar & Energy Audit FAQ
Our tool uses NREL PVWatts methodology for production estimates and current state incentive data. Actual payback varies ±10-15% based on site-specific conditions.
Batteries add $10-15k upfront but qualify for 30% ITC. They're most valuable in areas with high time-of-use rates or unreliable grid power.
Our premium DSIRE integration provides a complete list of state and local rebates, tax credits, and SREC markets for your exact location.
Net metering credits you for excess solar at retail or wholesale rates. States with full retail net metering have 30-50% higher solar ROI.