Porsche Battery Maintainer
quattro at frank.mercea.net
Wed Apr 12 15:40:08 EDT 2006
On Apr 12, 2006, at 1:32 PM, Ned Ritchie wrote:
> Charging while keeping the battery charged does not prevent the
> lead from
> sulfating on the plates.
Sulfation doesn't happen above a certain state of charge, and
certainly not on a battery kept on float; that's the whole point of a
maintenance charger. A float charge won't reverse sulfating that has
already occurred (most likely), but it will prevent further sulfating.
> There is a battery maintainer that works
> differently. It is used by the US Military and others.
The US military is also spending billions on a missile defense system
that doesn't work. Also, the tests conducted by the university cited
by Pulsetech conveniently omits the fact that the batteries compared
were a)battery connected to a pulsing device with a solar panel
trickle charger versus b)a battery connected to neither. Well...no
kidding the battery with the solar trickle charger was in better
condition and its state of charge increased. The "study" has never
been fully published on the web or anywhere else. Unpublished
university research = questionable/worthless/for-hire university
> It is NOT a
> charger, but it works better than a charger to keep your battery up to
Or you can build the same thing based off a 555 timer, for about $20
in parts; cheaper if you can find a suitable inductor and such in
scrap electronics, and a bit of breadboard and misc resistors and
such hanging around. Just google "DIY desulfator". There are at
least a couple designs floating around on the net, and in general
they're rumored to work far better than any of the "commercial"
systems. The maximum current of the pulse delivered seems to be a
major factor, as is the number of pulses- and the homebrewed units
with beefy cables deliver a bigger pulse and some designs even
incorporate a little LCD that displays a value roughly related to how
sulfated the battery is. Yes, they work- there are guys that make a
hobby/side business out of recycling old golf cart/forklift batteries
for their home solar systems and such.
It's also a built-in feature on a number of chargers made by Vector
(pretty good chargers, by the way. They had some QA issues with some
early units, but they're straightened out now; my first one died
within a month or two and was replaced by Pep Boys without much
complaint, even though I didn't have a receipt. The new unit has
worked great for quite a while.) The only annoyance is that the
Vector charger desulfator "mode" only works for 24 hours before
shutting itself off, for unjustified reasons.
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