sienna battery charger

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Old 15 Mar 2005, 11:57 am   #1 (permalink)
E Arredondo
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Default sienna battery charger

Our sienna's 04 battery got low after one of our toddlers hit the open door
button on the remote from within the house and we never saw the car at the
garage until next morning, I bought at sears the battery charger device and
charged the battery while installed in the car for like 5 hours at 12amps
(15? I don't remember) , Is that an acceptable way of recharging the battery
? Or should I had to remove it from the car completely and then charge it
outside ?


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Old 15 Mar 2005, 05:51 pm   #2 (permalink)
m Ransley
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Default Re: sienna battery charger

The charger has a amp input indicator or get one that does.

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Old 15 Mar 2005, 08:17 pm   #3 (permalink)
Jason James
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Default Re: sienna battery charger


"E Arredondo" <atk@sbcglobal.net> wrote in message
news:hmFZd.21980$OU1.7475@newssvr21.news.prodigy.c om...
> Our sienna's 04 battery got low after one of our toddlers hit the open

door
> button on the remote from within the house and we never saw the car at the
> garage until next morning, I bought at sears the battery charger device

and
> charged the battery while installed in the car for like 5 hours at 12amps
> (15? I don't remember) , Is that an acceptable way of recharging the

battery
> ? Or should I had to remove it from the car completely and then charge it
> outside ?


As arule it is not advisable to charge a car battery 'insitu' or in place.
You must disconnect one of the battery connections. Alternator power-diode
damage can occur. Its just too risky.

Jason


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Old 16 Mar 2005, 05:22 am   #4 (permalink)
m Ransley
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Default Re: sienna battery charger

Jason, how can you damage an alternator at 15A, you car puts out 60A? I
have never read that you can damage an alternator that way, By what you
are saying then jumping a car would do it also. I dont think so.

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Old 16 Mar 2005, 11:48 pm   #5 (permalink)
Jason James
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Default Re: sienna battery charger


"m Ransley" <ransley@webtv.net> wrote in message
news:17029-423816FB-605@storefull-3133.bay.webtv.net...
> Jason, how can you damage an alternator at 15A, you car puts out 60A? I
> have never read that you can damage an alternator that way, By what you
> are saying then jumping a car would do it also. I dont think so.



Diodes have other ratings apart from current. The important one here is PIV
raing or peak inverse voltage rating,....which is measure of how many volts
from an exterior source connected in a reverse bias way the diode junction
can handle before it punchs through,..which is how the power diodes in an
alternator would see a battery charger ie inverse or reverse volts.

Now about here you may be thinking "but the battery charger is not higher
than the alternator in voltage" true, but, there are things called 'voltage
transients' which are fast spikes of voltage which can easily exceed the PIV
of a diode or any solid state device. Transients can be generated by
inductive appliances (vacuum cleaners, or anything with a transformer or
motor *when its being switched on or off* on the same house-mains circuit.
These transients then flow thrui the primary and sec windings of the
charger, past the bridge, then into the cars electrical system.

When manufacturers build things like alternators,..they will use the power
diodes which are the cheapest for the job at hand. I-max rating is
considered, but PIV rating is a throw-up.

Jason


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