DC only alarm panel

USP makes a cheap little panel that's dc only

nick markowitz wrote:


Why not use a decent car alarm? Many are are under $40 and come with 2
remotes.

Jim Rojas
Technical Manuals Online!
http://www.tech-man.com
8002 Cornwall Lane
Tampa, FL 33615-4604
813-884-6335

another good call.  hadnt' considered car alarms.  do car alarms come with
zones?  I think I need 2 or 3.

USP makes a cheap little panel that's dc only

now that you mention it I think I have one of those out in the garage,
somewhere.
good call.

On 07/02/2011 1:49 PM, Techvoid wrote:


You can power your panel with another 12 battery.  Hook it straight up
to the AC input.  That way your solar panel only needs to charge the
first battery.  The system will keep the other charged.  Any panel will
do, but the smaller ones tend to draw less in the way of power.  On some
panels you may wind up with a "brown out" condition if the input voltage
isn't high enough so if your solar charger is having a problem
maintaining at least 13.1 to 13.4 VDC the keypad's could go into AC
trouble mode.  I think you'll have a better chance with the FBI XL-2
product.  It uses a 12VAC transformer rather than the standard 16VAC one.

--
Frank Kurz
www.firetechs.net

The DC input to the panel is polarity sensitive.

So .... if you apply the battery to the transformer terminals and the
panel doesn't power up. Reverse the polarity of the input.

The DC input to the panel is polarity sensitive.

So .... if you apply the battery to the transformer terminals and the
panel doesn't power up. Reverse the polarity of the input.

good to know,  thanks.

You want to be careful here.  I did what you are attempting to do a number
of years ago.  After research I used a Moose Z920 panel.  Was told by tech
support to apply 12vdc to ONE of the AC terminals so that the panel would
NOT go into AC Fail.  It worked great.

However I was also told that for the product line it was the only panel that
would allow this to happen because of I think a Zener Diode somewhere.

I have discussed this with newer panel mfg's and get very little response or
non at all because it is not policy to think outside the box therefore they
can sanction the modification.  "Liability".   If you are going to try it I
would suggest you do it on a non-important panel.  I doubt it will damage
anything on the board, it will either work or it will not.  If not try
another model or mfg..  Or if you can find a Z920 it will work.

======================================================
"I can power most any panel by putting 12vdc to the ac inputs?  didn't know
that!"
======================================================
And you still don't!!!

Good Luck

Les

On 08/02/2011 6:57 AM, ABLE1 wrote:



The rectifier bridge will ensure the proper voltage to the panel is
supplied.  If it doesn't work one way, it will the other.  Any panel
with a bridge rectifier will power up and function with a DC source to
some degree.  I think the FBI products employing the 12VAC transformer
will perform better.  I had a situation many years ago where I needed a
well filtered DC source for a camera system.  I used two 12 volt
Alltronix power supplies.  The first was connected to a standard 16VAC
transformer (the battery was also connected to this one).  The second
was powered off of the DC output from the first one.  That installation
is still going strong after ten years.

I can power most any panel by putting 12vdc to the ac inputs?  didn't know
that!

On 08/02/2011 6:03 AM, Techvoid wrote:


If you're a real techie, you can do anything for a home project.  This
application looks like it would certainly qualify as one!  :-)

I

Yeh sure. Big project!
Go down to Rat Shack and buy a small inverter.