How Long Do Solar Panels Last How Long Do Solar Panels Last? Lifespan, Degradation and Replacement Costs Solar panels typically last 25 to 30 years, although many systems can continue generating electricity for longer. Their output gradually decreases over time, but reaching the end of a warranty does not mean that a solar panel suddenly stops working. With quality equipment, proper installation, and routine maintenance, homeowners can benefit from solar energy for decades. For homeowners in the United States, understanding solar panel lifespan is important when comparing installation costs, calculating long-term savings, and deciding when equipment may need repairs or…