[Soekris] POE maximum voltage?

Paul Bartell paul.bartell at gmail.com
Tue Mar 27 14:34:35 UTC 2007


sorry i forgot to cc the list:

---------- Forwarded message ----------
From: Paul Bartell <paul.bartell at gmail.com>
Date: Mar 27, 2007 7:33 AM
Subject: Re: [Soekris] POE maximum voltage?
To: Dave Parker <daveparker01 at gmail.com>


you might consider a voltage regulator to put between the battery (i
dont know if they exist in 48v) and the poe injector.

On 3/27/07, Dave Parker <daveparker01 at gmail.com> wrote:
> I should mention that the battery bank itself is nominally 48vDC.
>
> Dave Parker wrote:
> > Hello
> >
> > I have what I'm guessing is a really easy to answer question:
> >
> > Is 59.2vDC an unacceptably high voltage to send through a POE injector
> > to a net4526?
> >
> > I've salvaged a bank of lithium batteries and charger from an electric
> > scooter, and while I'm suspecting that there are enough amp hours there
> > to run the board for "a very long time" without charging, I'd like to
> > use those amp hours for other things, so I'd like to use the charger
> > while the board is in operation. The charger's logic  appears to have
> > voltage top out at around 59.2v, and maintenance is around 56v.  The
> > former scares me a bit.  Will the board tolerate that?  Is there
> > something I should add to the circuit to protect the board while the
> > charger is operating?  The cat5 run from the injector to the board is in
> > the 5-8' range.
> >
> > I've tried finding a concise answer to this question with some extensive
> > googling to no avail aside from two documents that mention "absolute
> > maxium voltage = 68vDC.  That's not enough to make me feel secure about
> > my magic smoke, hence... I ask :)
> >
> > Thanks in advance,
> >
> > Dave Parker
> >
> >
>
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--
"If you are savvy and smart about the choices you make in life, The
sky is not the limit!"
Mark Shuttleworth


-- 
"If you are savvy and smart about the choices you make in life, The
sky is not the limit!"
Mark Shuttleworth


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