It is normal for high quality inverters to fail due to component failure after several years of operation. In addition to a good after-sales service system, manufacturers are also required to have good maintainability in the aspects of inverter production process, structure and component selection. For example, the damaged components have sufficient spare parts or are easy to buy, and the components have good interchangeability; In the process structure, the components are easy to disassemble and assemble, easy to replace. In this way, even if the inverter failure, also can be quickly restored to normal.