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Power draw of Servers

By gotTums? ·
I am trying to determine the power draw of each server I have and how to appropriate each server to UPS. I have been to the various websites of Dell and HP/Compaq and cannot find these important values of each server. They all list the power output and performance figures but no Amps consumption figures. Any Ideas?

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by shiny_topadm In reply to Power draw of Servers

One suggestion would be to check out the websites of UPS manufacturers. APC, just to name one has a tool (you can find it at ) to size your UPS. They have a large list of servers to choose from and their recommended size will certainly be valid to any manufacturer of supply. good luck

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by willcomp In reply to Power draw of Servers

Good advice in answer above.

Amperage is not important except for AC power circuit. Battery backups are rated in VA (volt-amps) which are closely related to watts. Note: we're dealing with AC power, not DC, since power supplies in PCs, monitors, and peripherals have AC input.

With a power factor of 1.0, VA = watts. Power factor of 1 would be a pure resistance load which does not exist in the real world. With inductance and capacitance loads in a PC, power factor is usually about 0.7 (as best I recall). So a 1000 VA battery backup will suffice for a about a 700 watt load.

So watts and VAs are what you are concerned with.


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by Oz_Media In reply to Power draw of Servers

Just contact APC they have a list of all servers by model and can tell you what minimum is needed depending on how many hours of protection or controlled shutdown etc. you need.

Saves a tonne of time!

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by Jaqui In reply to Power draw of Servers

after figuring out the needs of the power supply,
before buying a battery pack,
look into the few powercell options.
might be more expensive, but there are significant benefits.
( no dead batteries to replace, ever, no charge time. )
plain old tap water to power it.

tap water in, electrolisys to separate into hydrogen and oxygen, combined through the cell to generate electricity, output is electricity and water. no breakdowns, it's a chemical process. )

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by Hockeyist In reply to Power draw of Servers

How about using a True RMS Digital Clamp Meter?
This may help to determine the actual value for each server. Quick, simple, easy and close enough for determining your requirements. They are available from your local electronics store for about $100.

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by wlbowers In reply to Power draw of Servers

The numbers are on the equipment. Look for the ac input rating.
HP Pavilion XE783
AC Input 100 - 127v ~ 3.0A

The above is's server selector. It has them listed by model. Their selector lets you select the runtime you want then provides you with a solution.

Good Luck Lee

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