[kwlug-disc] UPS sized battery purchasing locally?

[John Johnson]

On 2014-06-01 23:57, unsolicited wrote:
> Most UPS', especially cheap ones, e.g. used to be APC Back-UPS vs 
> Smart-UPS, straight pass through the mains (surge protected). It's 
> only on battery power that you get conditioned power. 

You are describing another aspect of UPSes altogether, i.e. whether the 
output is the UPS generated AC* all of the time or only during 
brown/black outs.
The former eliminates the delays, however small, in the switch over from 
mains to battery generated power.

As for 'pure sine', I refer you to Andrew Kohlsmith's excellent addendum 
to my earlier contribution.

*UPS Generated AC: generated by a series of rectangular pulses in 
opposite polarities. Then, possibly conditioned, with chokes, reactors, 
etc. to remove or 'soften' the edges. The rectangular wave contains the 
harmonics Andrew mentioned.

Conditioning of the AC mains is yet another matter, as there is no need 
to remove or 'soften' the edges.But there may be a need to soften surges 
and transients on the line.

Andrew: I defer to your experience in the field.

jsquared



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