Power consumption on Cisco 4507R

[jackawang]

We are planning for the office move and I need to estimate how much power we need to run a fully populated Cat4507R switch. The chassis include 2 Sups, one 6-port fiber line card, two 48-port Gig and two 48-port FastEthernet line cards. The switch also has redundant power supply (4200ACV 1400W).

According to Cisco Power Calculator (http://tools.cisco.com/cpc/), I need 49.5 amp 110-120V circuit. It seems to be too much higher than real world. Does anyone have realistic information that how many 20amp circuit we would need when all the ports are fully utilized? Any information is much appreciated.

Power   Consumption/Heat Disipation Summary/Configuration Details
Slot	Line   Card	Output Current (A)	Output Power (W)	Typical   Power Used  (W)	Heat Dissipation (BTU/Hr)	Optional Uplink Module
Chassis	WS-C4507R	7.50	90.00	72.00	409.80	--
1	WS-X4013+	9.16	109.92	87.94	500.50	--
2	WS-X4013+	9.16	109.92	87.94	500.50	--
3	WS-X4306-GB	2.92	35.04	28.03	159.55	--
4	WS-X4548-GB-RJ45	5.00	60.00	48.00	273.20	--
5	WS-X4548-GB-RJ45	5.00	60.00	48.00	273.20	--
6	WS-X4148-RJ	5.42	65.04	52.03	296.15	--
7	WS-X4148-RJ	5.42	65.04	52.03	296.15	--
Total		49.58	594.96	475.97	2709.05
Total   Output Current	49.58   Amps
Total   Output Power	594.96   Watts
Total   Typical Output Power	475.97   Watts
Total   Heat Dissipation	2709.05   BTU/Hr
NOTE:
Output   Power is the amount of power delivered from the Power Supply to the Catalyst   4500. To figure Input Power, divide output power by .85   (typical efficiency of the power supplies).
NOTE:
Output   Power and Heat Dissipation numbers computed by the Cisco Power Calculator are   maximum values and can be used for facility power and cooling capacity   planning. These figure are not indicative of the actual power draw or heat   dissipation. Typical power draw is about 20% lower than the maximum value   shown. Also note that most of power allocated for PoE devices is dissipated   at the end points.

[Leo Laohoo]

Cisco Power Calculator

http://tools.cisco.com/cpc/launch.jsp

Hope this is what you are looking for.  Please don't forget to rate useful posts.  Thanks.

[jackawang]

I appreciate your response but read my post please. I have ran that tool and it came up with 49amp. That is the maximum number it could possibily draw but I'd like to know how much power the 4507 will actually draw in average in real world.

[dkraut]

If ~500 watts is real world, which sounds about right, you can calculate real world amps by Watts/Voltage.  So if you are using a 120V circuit, we would divide 500w by 120v, giving us a real world amp draw of 4.16 Amps.  Much better than 49! 

You'll obviously draw a lot more during power up/in-rush, but you can count on an average draw of around 4 amps.