How to Calculate Your Solar Cost
Step 1: Calculate your solar array size.
Step 2: Estimate your cost per Watt installed.
Hint: If solar is popular in your state (CA, CO, NJ) and you have asphalt or composite shingles, then use $6-$7/W. If solar is less popular in your state (VA, TX, MI) and you have a tile roof, then use $7.5-$9/W. If you’re unsure, $7/W is a good average.
Disclaimer: This calculator assumes no State or Utility rebate. Go to www.dsireusa.org to see if your area offers solar incentives. If you can figure that out, subtract it from the Estimated System Cost, then multiply the result by 0.3 to get the Federal Rebate. Then subtract the Local Incentive and Federal Rebate from the System Cost to get your Net Cost after Rebates.
