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. Solar inverters don't last forever, and knowing their lifespan can save you from surprise breakdowns. How Long Does a. First, the average lifespan of a solar inverter is about 10 years. This guide explains typical inverter lifespans, warning signs of failure, and when an upgrade is worth it, especially if you're considering adding a battery or EV charger.