[Asterisk-Users] UPS rating for SOHO asterisk box

[Andrew Latham]

get a kill-a-watt or lacrosse power monitor for $30 and leave it
running for a few days. then you can sort throw the data and know what
your power draw really is......

On 5/31/05, Andrew Kohlsmith <akohlsmith-asterisk at benshaw.com> wrote:
> On Tuesday 31 May 2005 10:50, Daryl G. Jurbala wrote:
> > Kids....do NOT try this at home.  The inverters in small UPSes are not
> > designed to deal with runtimes that exceed the batteries in them.  If
> > you run this setup well past the time it was designed to run (by adding
> > 3, 4, or more times that battery capacity it was ever designed to have)
> > that chances of a catastrophic inverter failure (meaning flash, boom,
> > fire) are very real and very likely.
> 
> Not to mention that the charging circuitry on a lot of UPSes is *not* smart;
> you hook up a bunch of lead-acid car batteries and the UPS may try to charge
> them a lot faster than the circuitry is capable of handling...  You can get
> around it with some other tricks but really -- what's your time worth, what's
> the venting for the car batteries gonna cost you, what's the additional
> circuitry gonna cost...  really.  Get a proper UPS for the job.
> 
> And yes, I am an electrical engineer.  Industrial power electronics, to be
> exact.  :-)
> 
> -A.
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Andrew Latham - AKA: LATHAMA (lay-th-ham-eh)
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