The inverter supports a maximum battery charge and discharge of 140A. As each of the two battery ports support a maximum of 25mm^2 cable/70A. If you require the 140A from a single battery/battery stack, you are required to connect your battery cables to a common bus bar for positive and negative and take a 25mm^2 cable to each battery port on the inverter. Setting 1 BAT 2 DC on your inverter battery settings and connecting to BMS port 1.