Frequently Asked Questions
How accurate is this solar calculator?
This calculator uses national average data for solar installation costs ($2.85–$3.50/watt before incentives), average electricity rates by state, and typical sun exposure. Actual quotes from installers will be more precise based on your specific roof, shading, and local labor costs.
What is the federal solar tax credit (25C)?
The Inflation Reduction Act extended the Residential Clean Energy Credit (25C) to 30% through 2032. This credits 30% of your total solar system cost (equipment + installation) from your federal income taxes. You must own the system (not lease) and have sufficient tax liability.
How long do solar panels actually last?
Most solar panels are warrantied for 25–30 years and will continue generating electricity at 80–90% of their rated capacity after 25 years. Inverters typically need replacement around year 12–15 ($1,000–$2,000).
Do I need to replace my roof before going solar?
Ideally your roof has 5+ years of life remaining. Solar installers won't install on a roof that needs imminent replacement. If your roof needs work, factor $8,000–$15,000 into your overall budget before adding solar.
Should I buy or lease solar panels?
Buying outright or financing with a home equity loan gives you the full 30% tax credit and maximum long-term savings. Leasing or PPAs (power purchase agreements) mean the leasing company captures the tax credit, resulting in lower savings for you. Ownership is almost always better financially long-term.
Do solar panels increase my home value?
Yes — studies from Zillow and Lawrence Berkeley National Lab show solar panels increase home value by approximately 4.1% on average (roughly $9,000 for a $230,000 home). This makes solar one of the few home improvements that both saves money and builds equity.