UPS for FreeBSD

Paul Pathiakis pathiaki2 at
Fri Nov 28 19:25:05 UTC 2014


Sorry, haven't had an oscilloscope for a long time. :-(

Also, you can't really measure double conversion sine on UPS, just 
what's output.

The first conversion happens going from power to the internal circuitry 
in the UPS going from AC to DC.

The second conversion happens going from internal DC to external AC.

Yes, they are recyclable.  You have to get to the recycle center, not 
throw them in the trash.

I'm not trying to read between the lines.  Anything that does not 
specifically say 'Double Sine Wave Conversion' is not; this is probably 
the safer bet.

I would hope that any power coming out of any UPS is cleaner than whats 
coming over the miles of power lines to your building/outlet.

However, when it spikes, browns out, etc (any fluctuation - major or 
minor) what's coming out of the unit at that point needs to be PFC at 
the level necessary to not damage the PSU or anything beyond it.

That is the end of my input on this thread.  It's become time 
consuming.  I believe a lot of people get what I'm saying here.


On 11/28/2014 13:28, Darren Pilgrim wrote:
> On 11/28/2014 10:22 AM, Paul Pathiakis via freebsd-questions wrote:
>> I agree with Warren on this, I've done the same.
>> The only issue with this is the proper disposal of the old batteries.
> Lead-acid batteries are recyclable.
>> from their web site, under the SMT750 Features page:
>>    * Pure sine wave output on battery:Simulates utility power to provide
>>      the highest degree of compatibility for active PFC (power factor
>>      corrected) servers and sensitive electronics.
>> "Simulates" utility power.  This is the sneaky little bit of marketing.
>> Saying it's sine output....  It is, but it's simulated.  I've been roped
>> in by the APC marketing machine previously.
> Rather than trying to read between the lines and conjecturing, hook 
> one up to an oscilloscope.  It's a sine wave.  The waveform I get out 
> of mine (I have whole lot of SMT-series units) is actually *cleaner* 
> than the mains power.

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