Good day I aslo have a 3.5KW 24V inverter system. AC input and output is connected on 2.5mm Surfex cable. During loadshedding max watts I am using is 500W. Don't use the maximum watts of the inverter. Sometimes you forgot about loadshedding then you use the kettle where you use 2.2KW for a few minutes. Have read most of the commons. What is the best size for AC input and output for the inverter. I know it depend on for size of inverter and load you want draw from the inverter.