Re: [EVDL] 20v to chassis ground.. bummer
Thanks Roland,
I cleaned the tops and around the posts and managed to get it down to 18v.
I also attempted to measure current leakage with a 50ohm resistor hooked up
to my multimeter and tested on a 12v bat and read .24a perfectly.
I get no measured current leakage when testing using 10a or 200ma from B+
to chassis ground... is that possible? Its a pretty cheap meter, I have
another that I'll use also.
[quote] "Roland Wiench" <xxx@xxx.xxx> wrote:
> Hello Dave,
>
> Take a voltage reading from a positive battery terminal to the battery
> plastic top. Place one lead on the battery terminal and the other one
> about
> 1/8 inch away from that same terminal and note the voltage.
>
> Now move the test lead on the plastic battery top by sliding it away from
> that terminal and you will notice the voltage will drop. This is normal
> with a lead acid battery with vent caps that allow battery fumes to vent
> out.
>
> The whole surface and even the battery box surfaces will become more
> conductive after each charge cycle.
>
> Spray the entire top surface with Windex that has ammonia in it. The
> ammonia is what is use in most battery cleaners to neutralize the battery
> acid. Also spray the inside the surfaces with this cleaner and wipe down
> with paper towels.
>
> One trick I did was before I install my batteries in my battery box which
> has a epoxy spray on surface which is the same stuff that is use to
> recondition tubs and showers that I got from any hard ware store. Also I
> lay in about 1/2 thick layer of baking soda for the batteries to set on
> which you can get in a big 5 lb box from a big box store.
>
> One more thing about the Zilla. If you have the battery negative going
> straight to the Zilla, it passes through right to the motor. If you are
> using a DC motor with brushes, then sometimes there could be brush dust
> tracking off the communtator, down the face of the communtator and to the
> motor shaft.
>
> I normally had to clean this area about once a month or until the motor
> resistance to ground reduce to 30k ohms. A new motor will normally start
> out at 20 megohms. To prevent this tracking across these surfaces, I pick
> up some spray motor enamel from a motor shop which I spray the front of the
> communtator down to the motor shaft and on the motor shaft up to the
> bearing.
>
> Both battery leads should be disconnected from the motor controller while
> charger. Either by a Anderson Disconnect or by a pair of contactors which
> can also be use as a emergency disconnect.
>
> Roland
>
>
>
>
>
>
> ----- Original Message -----
> From: "Dave Hymers" <xxx@xxx.xxx>
> To: "Electric Vehicle Discussion List" <xxx@xxx.xxx.edu>
> Sent: Sunday, July 08, 2012 6:52 PM
> Subject: [EVDL] 20v to chassis ground.. bummer
>
>
> > I was hopefully finishing up my truck today to spin the wheels with the
> > controller, not just a 12v battery.
> >
> > Current pack is 96v flooded trojan t875 and controller is z1k
> > The trojans are old, still holding with most around 7.95v after sitting
> > for
> > a month, some have visible dampness around the top seal, but not
> excessive
> > but this would be my first idea if some of it has leaked onto the battery
> > box and then truck frame causing a path for current?
> >
> > Help.
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