Cable Size

Hello everyone, i have a real problem here, my system consists of the following components,

1) Inverter driven 3ph ac Traction motor of S2-60 min rating 160A

2) with a steer motor : 100A

3) Inverter driven 3ph ac induction motor of S2-60 min rating 100A

4) DC -DC converter (48 - 24VDC) of input 10A

5) Three inverter enable inputs of 6A each ( total 18A)

I need to give supplies for each of these components from a battery of 48VDC 460Ah. But i m getting total of 388A. I m distributing this current through bus bar to each devices .

But the problem is that, the cable size from the battery to bus bar is 125% of 388A ( 388*1.25) ie. 485A for which is 240mm2(473MCM) of 500A. Now i m not getting the Battery connectors( Polycarbonate type) of that size. They are having max of 4/0 gauge only.

So, i want to know whether my calculation for the total current is right or wrong, because i have doubt in the case of motors of S2- 60 min.