Hi there,

Trying to figure out my power consumption of servers with respect of installing a new AC unit and potentially adding a battery pack on UPS. By no means do I consider myself an electrician so I would value your input.

I am basing my calculations of this article where in essense the formula is: Equipment BTU = Total wattage for all equipment x 3.5

Q: Is it safe to assume that if a server has dual power supply to double the wattage used?

After digging through some dell docs and random sites I gathered the following info and I am not sure if this is correct assumption:

 

	Dual Power Supply	Wattage	Total Wattage
PowerEdge 850	no	345	345
PowerEdge 1550	no	240	240
PowerEdge 1750	yes	320	640
PowerEdge 1750	yes	320	640
PowerEdge 1850	yes	550	1100
PowerEdge 1850	yes	550	1100
PowerEdge 1850	no	550	550
PowerEdge 1950	yes	670	1340
PowerEdge 2850	yes	700	1400
PowerEdge 2900	yes	930	1860
	Grand Total Wattage:		9215
	Total BTU needed:		32252.5

1 Ton of cooling = 12K BTUs roughly needing a 2.6 Ton AC unit.

Does this sounds right? Your thoughts?

Granted I am not including the room size etc. but I just wanted to make sure that I am calculating the consumption of servers correctly. I have also read that these are just starting numbers and that number of disks in raid and memory sticks in server will draw more power...something as adding 10W per per disk/memory stick...is this true??

Thanks for your time!