Frequently Asked Questions
How is the system size calculated?
We calculate the system size based on your monthly electricity bill, your state's average peak sun hours, and your desired energy offset. The formula accounts for panel efficiency (80%) and uses standard residential solar panel wattage to determine the number of panels needed.
What does the federal tax credit cover?
The federal Investment Tax Credit (ITC) currently allows you to deduct 30% of your solar installation costs from your federal income taxes. This is a direct credit, not a deduction, making it a significant financial incentive for going solar. This percentage may change in future years, so check current federal incentives.
What factors affect my solar panel payback period?
Your payback period depends on your system cost, annual electricity savings, available incentives, and local electricity rates. Higher electricity rates and more sun hours reduce your payback period. Installation costs, labor, and equipment quality also significantly impact the timeline. The 25-year lifespan is standard, though many panels last longer.
How accurate is this calculator?
This calculator provides estimates based on average conditions and standard assumptions. Actual results may vary based on your specific roof orientation, shading, local weather patterns, installation quality, and utility-specific rates and incentives. We recommend getting quotes from local installers for precise cost and performance estimates.