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AC/DC datacenter power changes
There’s considerable disagreement over the potential energy savings afforded by switching from AC- to DC-powered servers and storage in the data center–estimates range from 10 percent to 25 percent. The telecom industry has been using DC-powered equipment for years, so there is precedent for going this route, but significant savings must be demonstrated to propel DC power into the enterprise data center. The driving force behind the switch is the inefficiency of today’s AC power supplies.
The typical AC- to DC-power supply found in most servers is 70 percent to 80 percent efficient, which means that 20 percent to 30 percent of every watt delivered to a piece of equipment produces nothing but heat. Not only do you pay for the wasted electricity to run the equipment, you also pay for the electricity to cool the heat produced by that wasted electricity. Not good. In a data center using DC power, a rectifier–equipment that converts your utility’s AC grid power to DC power–typically operates at over 90 percent efficiency and doesn’t need to be located in the data center.
The article explains the whole concept very well, granted you might not do the change overnight but worth reading anyway.
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2 Comments
Hey Martin,
Good post. Just to give you a heads-up, I’ve written a few things about AC vs. DC power in the data center, including about a study that Berkeley Labs is doing comparing the two. It seems like the issue is starting to get some serious attention. We’ll see if people start talking about it more this coming year. I recently just did another story about United Airlines considering DC power in their new data center.
Mark if you could let me know the findings that would be great.