Hi I am building a small gantry hobby router using 2 Y, 1 X and 1 Z closed loopback steppers,

Closed Loop Stepper Driver 0-7.0A 24-50VDC for Nema 23 Stepper Motor

Motor Specification
Part Number: 23HE30-5004D-E1000
Number of phase: 2
Holding Torque: 2.0 Nm(283.28oz.in)
Rated Current/phase: 5.0 A
Phase Resistance: 0.42 ohms± 10%

my calculations for the required power supply(s) is

4 motors x 5 amps each x 50 volts x 120% = 1200 watts

since not all the steppers will be running at full power at the same time I can reduce the requirement by 25% = 900 watts required

Are my calculations valid?

What is better, two switching power supplies, 450 watts or one 1000 watt?

https://www.ebay.co.uk/itm/402646721...r=672923118722

Any suggestions gratefully accepted

Thanks