Most modern PV SYSTEMS are guaranteed to last at least 20 years, and experience has shown that many will still be generating >50% of their rated output after 40 years (ie: not “GOOD as new”, but still generating reliably), so it is CERTAINLY valid to consider what impact a PV project might have on your future ability to resurface your roof. In the ideal case, PV projects should only be installed on roofs that are rated to last another 20 years, such as young roofs that have been updated within the last 5 years, or more durable roofs that still have ~20 years left out of their expected service life. Standard residential roofs are rated to last between 20 and 50 years depending on the shingling PRODUCTS used, and commercial roofs have similarly broad ranges in lifespan, again depending on the surfacing products used. The PV itself will shield the roof from the sun’s rays, and ultraviolet light from the sun is the chief agent that causes most roofing materials to degrade over time, so PV will typically extend the life of most roofs, especially asphalt shingles or modified

Most modern PV systems are guaranteed to last at least 20 years, and experience has shown that many will still be generating >50% of their rated output after 40 years (ie: not “good as new”, but still generating reliably), so it is certainly valid to consider what impact a PV project might have on your future ability to resurface your roof. In the ideal case, PV projects should only be installed on roofs that are rated to last another 20 years, such as young roofs that have been updated within the last 5 years, or more durable roofs that still have ~20 years left out of their expected service life. Standard residential roofs are rated to last between 20 and 50 years depending on the shingling products used, and commercial roofs have similarly broad ranges in lifespan, again depending on the surfacing products used. The PV itself will shield the roof from the sun’s rays, and ultraviolet light from the sun is the chief agent that causes most roofing materials to degrade over time, so PV will typically extend the life of most roofs, especially asphalt shingles or modified