power supply draw

[bisquick]

Does anyone know if there is a difference in draw between power supplies? For example, if you have 150W and 300W power supplies, both hooked up to identical equipment, is there a difference in draw between the two? I'm putting together some racks and was wondering if getting a smaller power supply would extend the life of my UPS.

 

[cain8885]

I am also very curious about your question, not from a PS point of view but im curious as to how much power my 300watt powerman pulls out of my wall.

Cain

 

[LordEdmond]

the differance will be small but the larger unit will "draw" slightly more larger components greater heat loss but this will be small

IMHO go with the larger psu the ups will not notice the diff maybe run for 10sec less

but how good is the battery this will have a shorter life with age?

for the above post how much gear is in the pc ? as 99% comes out in heat you need less heating in winter but more a/c in summer approx 150 watts, cannot be bothered to work it out in Kilo joules


on the ups set at work 1.5 mega watt for 15 mins we lost approx 30 sec / 6 months due to the batts.
yep main frames note more that one hanging on to it plus very many pc ( very dirty switch mode units with plenty odd order harmonics) ugggg

 

[bisquick]

I figured there would be a small difference. That's good to know that it's not a major one. I'm guessing the choice of CPU and amount of memory will influence the power requirements more than anything.

I recently got a Smart-UPS 700 RM 2U and want to run 4 machines on it. Two will be up all the time, while the other two will be up only sometimes. For cost reasons they will be single CPU boxes, although one of them will have a RAID.

The power tends to go out more frequently than I would like. The leaner I run the better the chance I have of staying up. Any suggestions you may have would be greatly appreciated.