NCI is pleased to offer the following industry-leading warranty for solar projects it installs: Commercial Installation and Workmanship – 1 year on workmanship of the solar array. Commercial Equipment Warranty provided by Vendor Partners  Racking – Typically 5-year finish, 25-year material defect warranty. Inverter – 5-to-10-year warranty. Solar Modules – 25-year energy performance, typically 10-to-20-year product workmanship warranty, 25 labor warranty (subject to equipment warranty requirements).