Tools
Run the numbers yourself
Answer once in any tool or the Solar Check; the others reuse it. Nothing leaves this device.
Will solar pay for itself on your roof?
Production from NREL's model, at your real rate, with the federal credit shown at $0 and dated.
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How many panels do you need?
From what you actually use, the panel wattage available, and the production factor where you live.
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Solar cost estimator
Low, typical and high dollars per watt for your system size, roof complexity and state.
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Cash, loan, lease or PPA
The same system four ways over 25 years — escalators, dealer fees, who owns the tax benefit, and what happens when you sell.
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Net metering where you live
What your state actually credits you for power you export, and whether existing customers are grandfathered.
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Your right to cancel
The three business days the FTC gives you to cancel a contract signed at your home, what your state adds, and who to call for free.
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