#Adani-Solar-Rooftop-in-Vadodara #Geetanjali-Engineers How long does a solar roof last? Image result Service Life. Both solar panels and shingles have long life spans, typically upwards of 20 years. However, the longevity of solar shingles varies by the manufacturer and the installation. Warranties also vary; when you purchase solar shingles, be sure that you note the difference between power warranties.