Re: DATACENTER: computing KW-hours from AC current

[db@warp.net (David Bartlett)]

Pete,

P=IE   power = current times voltage
P=20A * 120V (use max line voltage for calculation, not 110)
P=2400W=2.4kW ongoing current draw
2.4kW * 24h = 57.6kWh usage per 24 hour period

Of course a 20A device needs a 30A circuit to allow for safe duty cycle, but you knew that. :)


db


>
>This topic was discussed briefly a week or two ago, but there 
>did not seem to be a conclusive answer.  I would like to 
>determine the KW-hours used per day by a device that is drawing 
>a steady 20 Amps at 110 VAC.  The calculations are trivial in
>DC but I'm not sure they are as simple for AC loads.  Does 
>anybody have a formula for this?
>
>Thanks,
>pete@brass.com
>
>

David Bartlett                              db@warp.net
Director of Operations                      WARPnet Holdings, LLC
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