[kwlug-disc] UPS sized battery purchasing locally?

[unsolicited]

You're still missing the point John.

'pure sine' is usually only important as an indicator for line conditioning.

Like saying something is icy doesn't mean it's made of ice. Merely cold, 
or cool. Even mints.

Whether the waveform is pure or square, largely doesn't matter, you get 
what you get at that price point / functional tier level. Other feature 
functionality will come into play / be more important between two 
similarly priced units, than whether it's pure or square. But such 
labelling usually indicates line conditioning, which is what one is 
looking for in looking for such features.

The technical specifics don't actually matter - you have no control over 
it, and it isn't going to be a deal breaker. For the purposes of this 
conversation. Either will be 'good enough', or the model won't be 
saleable and present in the first place.

So 'sine' is a feature point/descriptor for line conditioning. No more.


On 14-06-02 08:07 AM, John Johnson wrote:
> 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
>
>
>
>
>
>
> _______________________________________________
> kwlug-disc mailing list
> kwlug-disc at kwlug.org
> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>