At least 25 years will last a solar array. The surrounding roof must be in good shape. If your roof is more than ten years old, you should have it checked to calculate its lifetime. Before installing Solar, you may want to consider repairs or replacements. In some cases, work can be folded into the federal tax credit to increase the structural capability of your roof to support a solar installation. (Note: This applies only to structural improvements and not to re-roofing). The IRS code is vague about the exact extent of the roof work that can be rolled into the federal tax loan. We suggest you consult the details of your roof with a tax expert.
