[DML] Re: How to figure battery life

["twinenginedmc12" <twinenginedmc12@xxxxxxxxxxxxxxxxx>]

Hi Elvis.

I looked it up on the internet.  Evidently, reserve capacity is
specified in the number of minutes that the battery will pass 25
Amperes before discharging to 10.5 Volts.   

Rick.

--- In dmcnews@xxxxxxxxxxxxxxx, "Elvis" <elvisnocita@...> wrote:
>
> 
> Strange formula - never heared something like that before.
> Why would somebody divide it thru 25 ?
> I have never seen that on car batteries. Where did you find 
> that stuff ?
> 
> Would be interesting to see even though it is not really applicable
> on cars.
> 
> Elvis...9 years on my daily-driver's battery....BOSCH Silver...
> 
> 
> >
> > Batteries specify reserve capacity as "so many minutes at 25 Ampere 
> load"
> > 
> > The mathematical formula is:
> > 
> > "reserve capacity" times 25, divided by the current drain from the
> > LEDs.  Yields capacity in minutes.
> > 
> > Here's some hipshot math with a fictitious battery.
> > 
> > 120 minutes reserve capacity times 25 = 50 amphours.  120 leds draw
> > about 2.4A.  Could be 1.2A, could be 4.8A. 
> > 
> > That would yield a spread of 10 hours to 40 hours useful time.  
> > 
> > You could measure the current drain with a current meter, and get 
> more
> > accurate results.  The reserve capacity of your battery might be
> > written on it somewhere, probably in teeny tiny letters.
> > 
> > Rick
> > 
> > --- In dmcnews@xxxxxxxxxxxxxxx, "daviddelorean" <daviddelorean@> 
> wrote:
> > >
> > > I'm trying to figure out how long a fully charged battery will 
> last. 
> > > What is the mathmatical formula for doing it? All my lights 
> (except 
> > > headlights) are LEDs. The tail & front market lights have 45 
> diodes, 
> > > the side markers have 3 diodes, license plates have 6 diodes, 
> door 
> > > markers (assuming I keep the doors open) have 6 diodes.
> > > 
> > > So with doors open and parking lights on (headlights off) how 
> long will 
> > > my batter last from a full charge?
> > >
> >
>



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