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Re: How long is too long?
by lyle
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Some military vehicles and generators used to use a photovoltaic array that went to dc-dc trickle charger for flooded batteries and they did require weekly to monthly maintenance to ensure the electrolyte did not boil off. But now, most military units are gravitating to gel cell so they disconnect the photocells. This is primarily due to the cheap dc-dc chargers were found to be draining the gel cell batts (at night).
--- On Wed, 5/14/08, Peter VanDerWal <evdl@...> wrote:
> From: Peter VanDerWal <evdl@...>
> Subject: Re: [EVDL] How long is too long?
> To: "Electric Vehicle Discussion List" <ev@...>
> Date: Wednesday, May 14, 2008, 5:56 PM
> It probably would keep ift from sulfating, but the constant
> charging while
> sitting for several months will likely boil off a
> significant quantity of
> electrolyte.
> If you cook off enough you'll expose the plates which
> is probably worse
> than simple sulfation.
>
> > Well, here's a dumb question:
> > I understand that using a photovoltaic array on
> your car's roof
> > wouldn't provide enough power to charge a traction
> pack in reasonable
> > time, but could it provide enough of a
> "trickle" charge while parked
> > to prevent this sulfation and extend the battery's
> life? If not, can
> > someone explain why not?
> >
> > On Tue, May 13, 2008 at 8:48 AM, Bill Dube
> <billdube@...>
> > wrote:
> >> Sulfation is kind of like plaque on your teeth. If
> you remove it just
> >> as it is forming, it doesn't harden and become
> very difficult, if not
> >> impossible, to remove.
> >>
> >> As the sulfation ages, it "hardens" and
> becomes increasingly
> >> difficult to remove. Thus, letting lead-acid
> batteries sit, partially
> >> discharged, is unwise.
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
--- On Wed, 5/14/08, Peter VanDerWal <evdl@...> wrote:
> From: Peter VanDerWal <evdl@...>
> Subject: Re: [EVDL] How long is too long?
> To: "Electric Vehicle Discussion List" <ev@...>
> Date: Wednesday, May 14, 2008, 5:56 PM
> It probably would keep ift from sulfating, but the constant
> charging while
> sitting for several months will likely boil off a
> significant quantity of
> electrolyte.
> If you cook off enough you'll expose the plates which
> is probably worse
> than simple sulfation.
>
> > Well, here's a dumb question:
> > I understand that using a photovoltaic array on
> your car's roof
> > wouldn't provide enough power to charge a traction
> pack in reasonable
> > time, but could it provide enough of a
> "trickle" charge while parked
> > to prevent this sulfation and extend the battery's
> life? If not, can
> > someone explain why not?
> >
> > On Tue, May 13, 2008 at 8:48 AM, Bill Dube
> <billdube@...>
> > wrote:
> >> Sulfation is kind of like plaque on your teeth. If
> you remove it just
> >> as it is forming, it doesn't harden and become
> very difficult, if not
> >> impossible, to remove.
> >>
> >> As the sulfation ages, it "hardens" and
> becomes increasingly
> >> difficult to remove. Thus, letting lead-acid
> batteries sit, partially
> >> discharged, is unwise.
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
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