The low frequency pure sine wave power inverter is not easy damaged ,it is no problem to use for 3-5 years .However, we don't exclude the possibility of the inverter borken after serveral years of use or some sepcial factors cause the inverter broken .Then you need back-up board to replace,usually just change the control board is ok , but if mosfets in main board burned , then you need replace main board and control board both . 

We will sent by DHL ,FEDEX or TNT, buyer is responsible for the import tax if happened ~ --<-<-<@