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Looks like I'm not using as much power as I though. My two servers (big Dell PowerEdge and old Dell desktop), routers and switches only draw about 180W.


Yeah you'd be surprised some times. However, go and work out how much that actually costs per year and you'll be surprised

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A question about watts and kwh. Is the relationship between them a simple one ?

Is it just a case that if I am drawing 180W constantly that I am using 0.180 kwh every hour ?


Yep. In Australia it's about 13c/kWh so your servers would cost about $200/year to run. See what I mean about the cost?
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)