Thanks Jeff,
Great link to the "Bad Boy chargers"! http://www.evalbum.com/tech

I dislike the circuits a bit because of the need for transformers!
And a rough estimate by Farday's law; if 1 Farad is delivering one Ampere
for one Second  if it was charged with one Volt (right?), then:

lets say 1000uF = 1 mF = one Thousands F but with 100 times the voltage and
in a hundredth of the time should get me into the 10 A Range ~ right?

Of course I will have to calculate using the internal resistance of the
capacitors how much Wattage would be lost in the caps and if the would get
hot, Maybe they could each get an individual water bath?


On Thu, Mar 26, 2009 at 6:02 AM, Byron Jeff <byronjeff@clayton.edu> wrote:

> rn Thu, Mar 26, 2009 at 01:53:19AM -0400, Tobias Gogolin wrote:
> > Hi happens that I find the piclist to be the community of the fittest
> > electronic engineers that I know on the web, that's why I ask here and
> not
> > on some of grid living list...
> >
> > I may have mentioned before that I use 10 pc. 12V car batteries at my of
> > grid ranch, and that I charge those using a simple rectifier, either
> Bridge
> > from 120V AC or 2 diodes using half of each of the 2 120V outlets around
> the
> > center of my generators 240 V AC output (I do that to reduce the chance
> of
> > any one of the automatic breakers of the 2 120V circuits from tripping).
>
> >
> > This seems to work quite good, but I just read that it is not advisable
> to
> > charge Car batteries on pulse current, and since they would be charged
> only
> > when the generators output voltage reaches above their current charge
> > voltage, it definitely is pulse...
>
> I saw the term 'car battery' and an alarm went off in my head. What exactly
> is your application? The reason that I ask is that car batteries are
> specifically constructed for a single application: deliver a large amount
> of power in a short timeframe (starting) and then expect to be immediately
> recharged. They are not good for other applications such as delivering
> steady power for long periods of time. Batteries for that application are
> called deep cycle batteries. Just a heads up.
>
> As for charging, this is a common problem in the electric vechicle world
> because an EV main pack would be contructed quite similarly to the pack you
> described. The circuit that you described above is called a Bad Boy
> charger, and you've described some of the problems with it including
> tripping breakers and poor power factor correction. Several improved, and
> more importantly safer, circuits are outlined here:
>
> http://www.evalbum.com/tech
>
> Specifically take a look at the Bonn charger circuit described by Lee Hart.
>
> Hope this helps,
>
> BAJ
>
>
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