Right on Joe,
I know it is obvious to many, but it may be worthwhile to some on the group to mention some basic electrical concepts now and then.
The main one at play here is that heat (measured in watts) in a conductor is proportional to the square of the current (in amps) times the resistance (in ohms) of that conductor. Therefore one can very easily check the condition of their high-current wiring by doing a simple "touch test". Touch every connection after a high-power run and look for any that are hotter than normal. Do this regularily and you'll quickly get a feel for the health of your wiring and hopefully be able to spot any impending trouble early. Instrumentation is nice, but this simple "touch test" is cheap and foolproof.
Jim
--- In electricboats@yahoogroups.com, Joe McLaughlin <joemcl1@...> wrote:
>
> If the jumper between #4 and#3 is getting warm while the others are cool I
> think( for sure) that you have a bad connection to your battery or the
> connector lug on the ends of the #4 to#3 jumper.
>
> On Fri, Jun 17, 2011 at 11:12 PM, acsarfkram <acsarfkram@...> wrote:
>
> > **
> >
> >
> > My PakTrakr warned of a failing battery, battery #2. Under load of 40-50
> > amps #2 was running in the low 11 volts. I cleaned up the contacts (and
> > found a loose connection between #2 and #3!!)and the alert went away. Then I
> > ran the motor at 30 or so amps for five minutes and got an Alert on the #4
> > battery. The reading under load was again in the low 11 volts but on the #4
> > battery. The #2 battery is now right with the other batteries, in the upper
> > 12 volt range. The jumper wire from #4 to #3 is getting warm while all the
> > other jumpers are cool.
> >
> > I'm preparing for a bad battery but curious about the migration of PakTrakr
> > Alert.
> >
> > Any thoughts?
> >
> > Four group 27 AGMs for a 48 volt bank
> >
> > Mark
> > Santa Cruz
> >
> >
> >
>
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