How to enlarge the LD53 battery discharge current?

With our Solax inverter supports two modes of connection way of the battery,one is expansion and another is power expansion, and the wiring mode and inverter Settings are different.
Expansion cable (the power cable needs to be connected hand in hand between batteries), and the battery parallel mode is set to Converge.
Power expansion cable (the power cable needs to be connected to a copper bar), select Alone. In Alone mode, 2 PCS battery up to 180Amp, 3 PCS battery up to 270Amp, 4 PCS battery up to 360Amp (currently supported up to 360Amp)