Re: How do redundant power supplies in servers work?

Once upon a time, Seth Mattinen <sethm-z7IltzP/[email protected]> said:
> Yeah, any UPS that outputs a stepped approximation sine wave (rather
> than a pure sine wave) will probably not play nice. Always go for the
> pure sine wave models for important stuff. Of course, convincing a
> client not to cheap out on the UPS is a different story.

A switching power supply (as found in all computer power supplies)
really doesn't care.  There's a reason most modern supplies can run on
any common power (50/60 Hz, 120/208/240 V).

Also, the referenced blog is wrong AFAIK; APC SmartUPS models are not
online UPSes.  They do have a "pure sine wave", although APC doesn't
give a total harmonic distortion, just the "pure sine wave" (marketing
speak) line (or at least this was all true the last time I looked).

The only real take-away from that blog is that BackUPS are apparently
crappy UPSes.
-- 
Chris Adams <[email protected]>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
-- 
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