It certainly won't work with a linear power supply- the transformer at
the input will not accept a DC input. I'm not 100% sure whether it will
work with a switching mode power supply. Most likely not because the
input voltage would be below the rated AC input voltage. Also the input
rectifier may not be able to pass a continuous DC current without
burning up. Use a DC-DC converter intended for this purpose.
Patrick
Rick Smith wrote:
stupid question.
Normally, power supplies convert from AC to DC.
If you wire DC into an outlet, and plug an AC power supply into it, will it
just cut down the DC to whatever that P/S is supposed to provide to the POE
unit, and pass the rest ?
i.e. Solar 48V -> 24V Batteries -> 24VDC -> Outlets w/"normal" AC P/Ss
plugged into them outputting 5vdc to an AP or the like - will it work ? I
imagine it will, albeit terribly inefficient...
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Paul Hendry
Sent: Saturday, November 25, 2006 7:32 AM
To: 'WISPA General List'
Subject: RE: [WISPA] External battery on UPS
Looking for the most efficient use of the battery power and the kit to
achieve it. Old APC's are easy enough to track down on ebay but normally
only have standard AC outputs so I'm guessing you would connect both an APC
and Ethernet direct to the batteries?
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Mario Pommier
Sent: 24 November 2006 19:04
To: WISPA General List
Subject: Re: [WISPA] External battery on UPS
Yes, Paul.
What are you looking for?
Mario
Paul Hendry wrote:
Just out of interest, does anyone run batteries (via fuses) directly
into
cat5 instead of converting back to AC just to run standard 48v PoE up
the tower?
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Ron Wallace
Sent: 17 November 2006 21:19
To: WISPA General List
Subject: Re: [WISPA] External battery on UPS
Thanks Brian
-----Original Message-----
From: Brian Rohrbacher [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 15, 2006 09:41 PM
To: 'WISPA General List'
Subject: Re: [WISPA] External battery on UPS
I'm pasting Gino's link to the right thread.
Then I can search me email in a year and find the correct thread....
Connectors:
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=263-110
Batteries:
http://www.donrowe.com/batteries/8a31dt.html
Brian Rohrbacher wrote:
Can we get some links to these batteries that work well?
Gino,
Got a link to the DC block connectors you were talking about?
Brian
Travis Johnson wrote:
Hi,
We run two 4 gauge power wires out the front of the case, connect
the positive to a 60A fuse, and then to the batteries.
We are using AGM type (same thing used in UPS systems) big batteries
(a little bigger than a car battery, but each battery is 110 pounds).
We wire them in series (to get 24VDC).
This setup has only been installed for 12-18 months at various
locations, so I don't have an estimate on battery life.
Travis
Microserv
Brian Rohrbacher wrote:
You got any pics of this or similar Travis....anyone?
Travis,
What APC do you use and what batteries are added? What do you draw
and what is th run time? Do you know how many times the one with
the most cycles has been drawn down? How long do the batteries last?
Brian
Travis Johnson wrote:
You can't use just 1 battery. The APC units want to see 24vdc, so
you need two batteries running in series.
It works perfectly, as I have 20+ remote locations running off two
gel type batteries. Make sure you install some type of a fuse on
the positive side of the connection.
Travis
Microserv
Mark Nash - Lists wrote:
I believe I remember some discussion on this list on connecting
an external battery to an APC UPS. I'm in the middle of doing it
right now and am having problems. The UPS just beep continuously
with the 'bad battery' light on. I'm using a Lifeline deep cycle
battery. Any ideas?
Mark Nash
Network Engineer
UnwiredOnline.Net
350 Holly Street
Junction City, OR 97448
http://www.uwol.net
541-998-5555
541-998-5599 fax
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