HE.net, Fremont-2 outage?

Bryan King bking at inline.com
Wed Nov 4 16:56:32 CST 2009


Sry for the top post...

As more facilities are built/retrofitted with an eye toward overall efficiency using CCHP, we will start seeing more facilities (like Syracuse U's new datacenter) use systems like the Capstone turbines for primary power/secure power/CCHP. The main grid will become the backup. Not saying this approach replaces the need for batteries or some other storage device such as a flywheel system..


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From: Owen DeLong [mailto:owen at delong.com]
Sent: Wednesday, November 04, 2009 4:18 PM
To: Raphael Carrier
Cc: nanog at nanog.org; Joe Greco
Subject: Re: HE.net, Fremont-2 outage?


On Nov 4, 2009, at 2:08 PM, Raphael Carrier wrote:

>> I know you have a rather higher faith in batteries than some of us,
>> but practical experience suggests that batteries are merely a mostly-
>> reliable technology.
>>
>
> Agreed batteries are unreliable, an alternative to battery based UPS
> are flywheel energy storage devices, they come either as an integrated
> solution with the diesel generator (i think cat offers such a package)
> or as a standalone UPS (see:
> www.pentadyne.com/uploads/18/File/Pentadyne-VSS-Brochure.pdf)
>

Apparently you do not remember 365 Main...

Batteries are reliable.
Flywheels are reliable.

Both require proper maintenance and proper procedures to handle
corner cases (like the multiple-outage corner-case that took out
365 main).

Both have their issues.

In my experience working at and with a variety of datacenters, I have
to day that I have had generally better luck with batteries than
flywheels,
but, the key difference that suggests flywheels could actually be better
technology is this:

About 50% of battery failures traced back to human factors.

100% of the flywheel failures I experienced were human factors related.

Owen

Speaking as an individual, not representing any affiliation.







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