Re: koolatron 12v cooler drain my battery

"Anthony Matonak" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> lbbs wrote:
> > I saw koolatron 12v cooler for the road.   Just wondering how many hours
can
> > you run on the battery before it could be damaging effect on the
battery.
>
> I did a quick websearch and it seems it uses 3 amps (36 watts).
> A typical car battery ranges from 50 to 100 amp-hours of storage.
> Most of these batteries can be damaged by draining them more than
> 80%. For a small battery this would be 40 amp-hours or about
> 13 hours.


So is that 13 hours while the engine is running or when it is off?   Could
you turn it on for a couple of hours during the day when engine is off
(safely).   And then how many hours would you have to drive before the
battery would be fully charged again?



This is only for a brand new battery. An old battery
> will have less capacity.
>
> You should note that these things only go a maximum of 40 deg
> below ambient temperature. This means if it's 110 outside that
> the cooler will only be 70 deg. The inside of a car, especially
> one parked in the sun, can often be over 150 degrees.
>
> Anthony
>