How do I calculate the number of power modules required in a CE12800 switch

You can use Hardware Configuration Tool to calculate the number of power modules required in a CE12800 switch. The calculator is also integrated in the UniSTAR system.
You can also use the following method to calculate the number of power modules required:
Minimum number of power modules required = Sum of maximum power consumption of all working modules in the switch/Maximum power of a single power module + 1
For example, a CE12808 switch uses 2700 W AC power modules and is configured with two CE-CMUAs, five CE-SFU08As, two CE-MPUAs, and two CE-L48XS-EC line cards. Based on the power consumption values of the cards provided in the "Card" section of the CloudEngine 12800 Series Switches Hardware Description and the power consumption of the chassis (including fans) and power modules, the sum of maximum power consumption of all modules can be obtained: 2519 W. Therefore, a minimum of one 2700 W power module is required.
To ensure power reliability of a CE12800 switch, it is recommended that you use the N+N backup mode with double power supply systems so that the failure of a single power supply system will not cause power failure or restart of the switch. In the preceding example, the 1+1 backup mode is recommended.

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