Voltage through dual power supplies

[aistswc]

Hey,

Installing new IBM Blade H Chassis. Chassis has 2 2900 W power supplies. Documentation sez these are N+1 redundant. Can I assume that means that even while both power supplies are active, I will never exceed a need for more than 2900W input, and can base my capacity for a UPS purchase (to attache to one power cord) on that??

thanx in advance,
steve c.

steve c.
Systems Analyst
Superior Court, USVI

 

[stallard]

If the PSU's are redundant it means that either one can carry the full load of both in the case of a power failure, both PSU's will share the load in normal operation. If you are connecting one cord from each PSU to a different UPS then you will need to size both UPS's to be capable of supporting the full load.