Solar inverters last 10–15 years on average, with microinverters and power optimizers often lasting 20+ years. Heat, quality, installation, and maintenance heavily influence lifespan. Inverters contain. . The lifespan of your inverter directly affects your ROI, but most importantly, your maintenance planning and overall system workability. In this guide, we'll explain inverter lifespans based on technology type, usage, and environment, and examine the key maintenance practices, repair options, and. . While solar panels can last 25 to 30 years or more, inverters generally have a shorter life, due to more rapidly aging components.