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Power supply upgrade? It does not show that....what's wrong?

I was upgrading a Catalyst 4506-E power supplies from 2 - 2800W 220v with a single 220 connection for each power supply and going to 2 - 4200W 220v with 2 - 110v connections for each power supply. Now my available wattage is lower than the 2800W power supplies.... why? Here are the outputs of a switch with 2800W power supplies and a switch with the new 4200W power supplies. Notice the switch with the smaller power supplies has a maximum available wattage of 2800 while the switch with the larger power supplies only has a max of 2100. Why is it less? Is it because the 2800 has 1 - 220v connection and the 4200 has 2 - 110v connections?

4503#show power
Power                                             Fan      Inline
Supply  Model No          Type       Status       Sensor   Status
------  ----------------  ---------  -----------  -------  -------
PS1     PWR-C45-2800AC    AC 2800W   good         good     good  
PS2     PWR-C45-2800AC    AC 2800W   good         good     good 

Power supplies needed by system    : 1
Power supplies currently available : 2

Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)        480        1360
Inline Power (-50V)       645        1400
Backplane Power (3.3V)      0          40
----------------------   ----     ---------
Total                    1125        2800

Module Inline Power Summary (Watts)
(12V -> -48V on board conversion)
---------------------------------
                    Maximum
Mod      Used      Available
---      ----      ---------
1          64            175
---      ----      ---------

********************************************************************************
********************************************************************************

4506-E#show power       
Power                                             Fan      Inline
Supply  Model No          Type       Status       Sensor   Status
------  ----------------  ---------  -----------  -------  -------
PS1     PWR-C45-4200ACV   AC 4200W   good         good     good  
PS1-1                         110V   good        
PS1-2                         110V   good        
PS2     PWR-C45-4200ACV   AC 4200W   good         good     good  
PS2-1                         110V   good        
PS2-2                         110V   good       

Power supplies needed by system    : 1
Power supplies currently available : 2

Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)        610         709
Inline Power (-50V)      1351        1450
Backplane Power (3.3V)      0          40
----------------------   ----     ---------
Total                    1961 (not to exceed Total Maximum Available = 2100)

Thanks,

Mike

1 REPLY

Re: Power supply upgrade? It does not show that....what's wrong?

Never mind....I found the information as to why here is the document if anyone is interested.

http://www.cisco.com/en/US/customer/prod/collateral/switches/ps5718/ps4324/prod_bulletin0900aecd802d5351.html

Thanks,

Mike

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