[tcb] Re: Question about running coach batteries (Gerald are you out there?)
- From: Neil <nbmdude@xxxxxxxxx>
- To: tcb@xxxxxxxxxxxxx
- Date: Fri, 25 Apr 2008 13:53:32 -0700 (PDT)
Man, you've always got the good info!
--- "Gerald V. Livingston II"
<gerald.tcb@xxxxxxxxxxxxx> wrote:
> Battery manufacturers suggest that if you are going
> to run multiple
> batteries that they be rated exactly the same.
> Otherwise you will have
> one sucking more of the charging current during a
> charge cycle and also
> one providing more power than the other during a
> discharge cycle. The
> discharge rates may also be different which makes
> this condition worse,
> especially for deep cycle batteries.
>
> Explanation:
>
> Battery A is a 50 amp/hour battery with a nominal
> discharge rate of 10
> amps/hour
>
> Battery B is a 100 amp/hour batter with a nominal
> discharge rate of 20
> amps/hour
>
> The system is currently using 10 amps/hour total.
>
> Battery A provides 5 amps/hour of that.
>
> Battery B provides 5 amps/hour to the system, plus 5
> amps/hour to
> battery A because it can sustain a higher discharge
> rate.
>
> In this scenario battery B is th only battery
> actually being discharged
> until it gets low enough that it no longer provides
> power to battery A,
> only to the system. Battery A is barely discharged.
>
> Now, you stop using the system and start up the
> charger. Battery B has
> been deeply discharged and pulls most of he charging
> amperage. Battery A
> gets only a trickle charge because it is showing as
> "full" to the charger.
>
> If this cycle repeats every campout battery A will
> be destroyed because
> it is not being deeply cycled the way it was
> designed.
>
> That being said, yes, + to + and - to - using the
> shortest cables
> possible. You may want to try running JUST the
> orange battery for a
> weekend. Camp in the driveway to test it out. It is
> about double the
> capacity of most "normal" deep cycle batteries.
>
> G2
>
> Trey Jung wrote:
> > Gerald,
> >
> > I'd like to add the "orange battery" I got from
> you to my existing
> > Trojan deep cycle battery in the Eurovan to
> increase my battery time
> > when I am camping like last week w/o AC hookups...
> >
> > Would I just run a jumper cable from the first
> battery to the 2nd (pos
> > to pos and neg to neg or do I need some special
> connector).....
> >
> > Trey
>
>
>
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