[Asterisk-Users] UPS rating for SOHO asterisk box

[Preston Garrison]

We actually did this, however we didn't use lead acide batteries, but 
GEL ones just like UPSes usually come with.  This way their are no 
venting issues etc.  It worked great, except don't put too much load on 
them.  The circuits actually started to fry when thr power went out and 
we had 5 servers humming away on one :)  Putting one or two on a UPS 
with a couple of car batteries it lasted forever.  Usually the charge 
circuitries consist of sensing when the voltage stops changing, or cuts 
the charge off when the battery reaches a certain voltage.  Either way 
if they are GEL cells, and the same voltage it could work :)   The UPS 
wouldn't know the difference, unless it has some sort of a timer 
circuit which cuts the charge off after a certain amount of time, and 
you wouldn't really know unless you tried it.

Preston Garrison
direct: 877-748-4142
fax: 310-774-3901
cell: 623-748-4140

-----Original Message-----
From: Andrew Latham <lathama at gmail.com>
To: Asterisk Users Mailing List - Non-Commercial Discussion 
<asterisk-users at lists.digium.com>
Sent: Tue, 31 May 2005 14:59:24 -0500
Subject: Re: [Asterisk-Users] UPS rating for SOHO asterisk box

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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