How long do solar panels last?

Solar panels and their associated parts and warranties are planned to last 25-30 years, although there are several accounts with a much longer duration. Their efficiency decreases by about.5 percent each year. Still, you might not even notice the increasing ability of our homes and devices, peppered with some solid energy usage habits. According to NREL, in year 20, a solar panel will still produce 90 percent of its original energy output by that math! Solar panels can, in theory, last forever, or until their efficiency reaches zero. This boils down to cell count and consistency.