A typical workmanship warranty from a solar contractor can range anywhere from 1 -10 years term, while Simple Solar offers a 25-year workmanship warranty. The workmanship warranty covers any defects in workmanship, like loose screws, firmware updates that were not installed upon installation, and roof penetrations. Contractors are typically responsible for any damage caused to the home during installations, such as broken tiles, damage to the roof, stucco, etc. The manufacturer parts warranty totaling on solar panels is anywhere from 10-25 years. Most panel manufacturers also have what is referred to in the industry as a Linear Output Warranty, typically for 25-30 years. This means that the panel will not degrade more than .05% per year over the 25-year period, leaving the panel’s efficiency somewhere around 85% typically in year 25.