How to calculate power consumption for a Proliant 5500 server

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I would like to calculate the kilowatt hours that this server will require for operation 24/7. It has two power supplies for fault tolerance.

The specs for the power supply are as follows:

Input Power 780W @ 110 VAC
Rated Input Current 8 A
Power Supply Output Power Low range High range
Rated Steady-State Power 500W 750W
Maximum Peak Power 540W 780W

Any help will be greatly appreciated.

[Oleg Koroz · Accepted solution]

Calculation should be done for one Power Supply with maximum load

http://tristate.apogee.net/lite/lecoeuc.asp
http://www.lightheat.com/Calculator.htm

Watts per Hour = The amount of watts per hour your product uses (averages are posted).