Can I use my federal tax credit for solar over 3 or 4 years?? ie: I qualifie for over 11k in tax credits, but my liability this year is only 2615.00

Yes, the unused credit will carry forward to future years if you tax liability limits the amount this year. However, it is not yet clear whether you can carry unused credits to years after the solar credit expires.

https://turbotax.intuit.com/tax-tips/going-green/federal-tax-credit-for-solar-energy/L7s9ZiB4D