Re: [WestMichiganHams] Re: 12v
- Use a relay with a drop out voaltge at around 11.5V. that will switch to the
set of batteries. I have found that some 24Vdc relay will drop out close to
that. You could also set up a relay system that would put the batteries in
parallel and have them attached to a 12V float charger. When AC Power fails,
The charger could be dropped from the system, the batteries put into seires
for 19VDC and us a regulator to drop the power back down to 13.8VDC. I will
look on the web, I know there is a voltage regulator circiut on the web that
will drop 24VDC to 13.8VDC at 35 AMPS. I fond it.
Sound like a fun project and a good idea. I will get my pendil out and see
about putting togeather a circuit drawing. I my self use 3 deep cycle
batteries in parallel but do not have a switcing circiut. I use them for all
operations and when the voltage drops to about 11.5V. (when radio has a
problem) I manualy switch to a power supply and charge the batteries.
There are many other projects on the web site.
----- Original Message -----
From: "Laryn Lohman" <larynl@...>
Sent: Thursday, January 19, 2006 12:17 AM
Subject: Re: [WestMichiganHams] Re: 12v
> ----Original Message Follows----
> From: Jack Amelar <jamelar@...>
> Reply-To: WestMichiganHams@yahoogroups.com
> To: WestMichiganHams@yahoogroups.com
> Subject: Re: [WestMichiganHams] Re: 12v
> Date: Mon, 16 Jan 2006 10:48:59 -0500
> While on the subject of 12V charging, here is something I've been
> wanting to do, but my research has so far come up blank. So any ideas
> would be welcome.
> I would like to use a system of 3x 6V golf cart deep cycle batteies in
> series, total 18V, to be regulated down to 13.8V during a power
> failure. I use the normal 13.8V power supply until a power failure
> occurs. I need some way to automatically switch to the 18/13.8 back up.
> Also need a float charger for the 18V and a heavy duty charger for the
> 18V to use when running a generator. Anybody ever hear of such a thing?
> 73 Jack NY8D
> Jack Amelar
> 1554 Lincoln Lake Ave NE
> Lowell, MI 49331-9711
> Home: (616)897-6885
> Office: (616)493-8736
> Pager: (616)339-0802 mailto:6163390802@... or
> I had something like that going once. I used relays. Simple and
> Switch the unregulated source, whether from the rectifier or 18V string,
> which then feeds the regulator. Power the relay coil from the rectifier.
> Laryn K8TVZ
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