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RE: [datacenter] Flywheel ups
I've only had one personal experience with a flywheel UPS, and while I'd
argue with Frank that a flywheel failure is more spectacular than a
battery failure (exploding batteries vs. airborne flywheel...well, let's
say "spectactular" in different ways :-), Deepak is right - the cost of
maintenance is huge on a flywheel system. Plus, if your target is
consistent steady-state costs, you can buy maintenance contracts for
either system that will achieve that goal.
..j..
============================================================
Jay Yu
Invisible IT, Inc.
heyyu at invisibleit dot com +1 650 605 6464
> -----Original Message-----
> From: Deepak Jain [mailto:[email protected]]
> Sent: Friday, 02 December, 2005 14:04
> To: Howard Marks
> Cc: Krzysztof Adamski; [email protected]
> Subject: Re: [datacenter] Flywheel ups
>
>
> That said, you probably don't need 10 minutes of ride through either..
>
> When a generator doesn't kick on, it takes facilities guys at
> least 30 minutes to have the >courage< to start flipping
> breakers when you are dealing with a 2MW monster (or
> several). I suspect with a 1000 sq ft data center, it'll
> still take at least 10 minutes to start flipping switches.
>
> :)
>
> DJ
>
> Howard Marks wrote:
> > Also you say you need 10 MIN of ride through. Powerware's flywheel
> > system has 120 SEC (2MIN) of ride through and an MG set
> isn't going to
> > give you 5 times the ride through if you have 1/5th the
> load like a UPS.
> >
> > -----Original Message-----
> > From: Deepak Jain [mailto:[email protected]]
> > Sent: Friday, December 02, 2005 4:32 PM
> > To: Krzysztof Adamski
> > Cc: [email protected]
> > Subject: Re: [datacenter] Flywheel ups
> >
> > You probably also realize that the maintenance
> (lubrication, bearings,
> > etc) on a flywheel easily exceed the amount of maintenance
> on a sealed
> > battery system.
> >
> > The difference (mainly) is that you have relatively uniform
> > maintenance costs instead of the jagged-saw tooth (with battery
> > replacement) that UPS systems have.
> >
> > Deepak Jain
> > AiNET
> >
> > Krzysztof Adamski wrote:
> >
> >>I'm starting to design a new 1000sqf datacenter in a
> building that has
> >>reliable generator backup. So I will only need about 10-15
> mins of UPS
> >>power (if the generator won't start in that time, it won't
> start for a
> >>long time :-). I will only need AC power.
> >>
> >>I was wondering what peoples opinion was of the flywheel type UPS?
> >>The plus I see is that there is no battery bank to worry about.
> >>
> >>K
> >>
> >>
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