[DML] Re: How to figure battery life
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[DML] Re: How to figure battery life



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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