I have the same problem with the card --I am going to remove C9 as a first step--its currently so sunny I dont want to shut down the system and leave the array unloaded so Ill do it one evening--this umits has done about 750 days sincefirst install--two more are working fine noi issues--I use a DG , 12KW array & 30KW stotage--grid connected system--this is a great thread Michael in Ireland