We are in the process of getting quotes for a new A/C unit for our main server room and I'm in the process of calculating our heat load. My dumb question is:

For devices that have redundant power supplies, do I need to factor in the wattage of the second power supply? My gut instinct says no since the 2nd power supply is there for redundancy and not capacity, but I want to be absolutely sure.

 

We recently added another unit to our server room(two wall mounted units now) and I wasn't fully involved but I'm pretty sure the HVAC didn't need the wattage. He only needed the total amperage on the circuit from the panel. Based on the total amps you can figure it out I believe. I also found this which may help.

http://community.spiceworks.com/topi...erver-heatload

 

The people managing the project requested wattage, so that's what I'm giving them.

I've decided that I'm only going to account for the wattage of one power supply with devices that have redundant power supplies. Since power supply wattage ratings are at maximum output, we should be well under what the heat load calculations come out to.

I AM, however, going to round up to the nearest thousand watts. My calculations are roughing out to 17,623 watts...so 18k watts of equipment that we want in the room.

We have half of what used to be in there at another location because of cooling problems.