Calculate your solar panel ROI with real sun hours data for all 50 states. ✅ Location-specific calculations (not generic averages) ✅ Complete financial breakdown: system size, costs, payback period, 25-year savings ✅ Accounts for federal 30% tax credit ✅ Factors in electricity inflation & panel degradation ✅ See environmental impact (CO2 offset, trees equivalent) Free, instant results, no signup required. Perfect for homeowners considering solar or just curious about the numbers.