How long will my system last?

Solar panels are warrantied for 25 years, so that should be your benchmark for system lifespan. However, you should expect to replace a few other parts along the way: Grid-tie string inverters: 10-15 year warranty Off-grid inverters: 5-10 year warranty Batteries: 1-10 year warranty (varies widely depending on technology and model/manufacturer) When looking at lifetime cost of ownership, be sure to account for scheduled part replacements along the way.