Re: (ET) FW: Diodes

["Tim Humphrey" <hump evgrin com>]

I'm kind of assuming that this is an AGM Battery. So I would think the
.7V diode drop would bring the cars charging voltage down to 14 volts
for this pack, resulting in a better charging setup.  By better, I
mean a little less chance of gassing the AGM's.

I guess we will have to know the exact make/model of the pack to be
able to determine what it will do... Jeremy?

Is this one of those Secure Start(R) things?

On 6/3/08, RJ Kanary <rjkanary nauticom net> wrote:
>
> Will there be enough forward voltage drop to prevent proper charging of 
> this battery? {Playing devil's advocate here.<G> }
>
> RJ
>
> Tim Humphrey wrote:
>
> From radio shack pick up Catalog #: 276-1144; which is a two pack of 
> 1N5404 3 amp diodes.
>
> Wire both of these together in parallel in the negative (black) lead 
> with the band pointing towards the car side. Or in the positive (red) 
> lead with the band pointing towards the batt pack.
>
>
>
>
>
>
> > -----Original Message-----
> > From: elec-trak-bounces cosmos phy tufts edu
> > [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Jeremy
> > Gagliardi
> > Sent: Tuesday, June 03, 2008 10:36 AM
> > To: elec-trak cosmos phy tufts edu
> > Subject: (ET) Diodes
> >
> >
> > This is only slightly related to Elec-traks, but I don't know of any
> > other forum that can answer my question.
> >
> > I have a 12V battery pack that charges by plugging into any car-style
> > power outlet.  The problem is, it allows voltage to go both ways.  If I
> > forget it's plugged in, and I turn off power from the vehicle, the
> > battery pack will immediately begin powering the vehicle.  I think this
> > has damaged a relay on 2 separate occasions.
> >
> > I want to prevent this behavior by putting 2 diodes on the line so 
> > power
> > only goes 1 direction.  However, I don't know what kind of diode to 
> > buy.
> > I went to Radio Shack and found some very puzzling codes on all of the
> > diodes and a staff that was less than knowledgable.
> >
> > Can someone on this list reply to this e-mail in private, and let me
> > know what kind of diode to buy as well as what code to look for for a
> > 12V, 5Amp system?
> >
> > --
> > Jeremy Gagliardi
> > E20
> > Potomac, Md
> >
> > mailto:Jeremy Gagliardi com
> > http://Jeremy.Gagliardi.com
> >
> >
>
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>