Understanding inverter lifespan and when to budget for replacement is key to protecting your investment and avoiding unexpected costs. Solar inverters last between 10 to 25 years depending on the type, with string inverters averaging 10 to 15 years and microinverters reaching 20 to. String inverters and microinverters demonstrate notable differences in their operational lifespans, with each type offering distinct advantages. Microinverters typically showcase impressive longevity, with an average lifespan of 20-25 years, often matching the warranty period of solar panels. The reliability of PV inverters is one of the important aspects to be enhanced in order to reduce the cost of PV energy, since it is closely related to the maintenance cost and the annual energy production. In this paper, the lifetime of NPC and T-type inverters, which are three-level inverter. In this review paper, an overview of the grid-connected multilevel inverters for PV systems with motivational factors, features, assessment parameters, topologies, modulation schemes of the multilevel inverter, and the selection process for specific applications are presented. The efficiency of these inverters directly influences the energy yield and economic viability of PV plants.
