Solar Calculators
Explore 10 free solar calculators powered by real NREL and EIA data. Find out if solar is worth it, how many panels you need, and more.
Federal Residential Solar Tax Credit (25D) expired December 31, 2025. State incentives may still apply.
Solar Panel ROI Calculator
Calculate your payback period and 25-year net savings with real NREL solar data.
How Many Solar Panels Do I Need?
Find exactly how many panels you need to power your home.
Solar Panel Cost Estimator
Get a cost estimate for your installation based on location and system size.
Federal Solar Tax Credit (ITC) Calculator
Calculate your federal solar Investment Tax Credit (ITC) savings.
Solar vs Grid Cost Comparison
Compare 25-year total costs of going solar versus staying on the grid.
Solar Battery Storage Calculator
Size your battery backup and calculate days of off-grid storage.
Solar Panel Degradation Calculator
See how panel output decreases over time and its long-term ROI impact.
Solar Net Metering Savings Calculator
Calculate your grid export credits and annual net metering savings.
Optimal Solar Panel Tilt Angle
Find the optimal tilt angle for your location to maximize solar output.
Solar Loan Payment Calculator
Estimate your monthly loan payments for a solar installation.