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You can claim 30% of the qualified expenditures of your solar system, including cost of the solar products (panels, inverters, hardware, etc), installation labor and any permitting fees associated with the job. In some cases, you may be able to claim the cost of any re-roofing or electricity work done in conjunction with the solar installation. I would definitely try for a full installation by the end of December. The tax credit could get extended, but I would not wait until 2017,
Let me know if you have any questions.