The federal Investment Tax Credit (ITC) allows you to deduct 30% of your solar installation cost from your federal taxes. For a $15,000 system, that's a $4,500 credit.

A typical solar payback period in the US ranges from 6 to 10 years. Anything under 8 years is considered excellent. Most systems last 25+ years, so you'll enjoy free energy long after the system pays for itself.

Your system size depends on your monthly electricity usage. A rough estimate is $20 of monthly bill per kW of solar needed. For example, a $150 monthly bill suggests a ~7.5kW system. A solar professional can give you a precise recommendation.

Yes! Many states offer additional rebates, tax credits, or performance-based incentives on top of the federal ITC. Our calculator uses a 5% estimate for state incentives, but actual amounts vary widely by location.