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Discussion Starter · #1 ·
Hi all,

Has anyone tried using silver filled conductive grease to lower
resistance of contacts in their EV, e.g painting a little onto the
terminals of your motor controller before bolting on the cables? I
recently picked up a tube of this stuff for a different application,
but it occurred to me that it could be good in EVs too:

http://www.chemtronics.com/products/product.asp?r=3&m=2&id=128

(But it also occurred to me that it might actually increase
resistance - I'm not sure just how conductive this stuff really is..!)

-Ian

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Discussion Starter · #5 ·
Ian Hooper wrote:
> Has anyone tried using silver filled conductive grease to lower
> resistance of contacts in their EV, e.g painting a little onto the
> terminals of your motor controller before bolting on the cables? I
> recently picked up a tube of this stuff for a different application,
> but it occurred to me that it could be good in EVs too:
>
> (But it also occurred to me that it might actually increase
> resistance - I'm not sure just how conductive this stuff really is..!)

Your intuition is correct. These greases are thousands of times less
conductive than any metal-to-metal connection. The active ingredient is
the grease itself -- it keeps air and water out of the connection. The
actual current-carrying part is simply the two metals being pressed
tightly together.

--
Ring the bells that still can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in -- Leonard Cohen
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net

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Discussion Starter · #6 ·
> Ian Hooper wrote:
> > Has anyone tried using silver filled conductive grease to lower
> > resistance of contacts in their EV, e.g painting a little onto the
> > terminals of your motor controller before bolting on the cables? I
> > recently picked up a tube of this stuff for a different application,
> > but it occurred to me that it could be good in EVs too:
> >
> > (But it also occurred to me that it might actually increase
> > resistance - I'm not sure just how conductive this stuff really is..!)
>

Yes, it will increase the resistance so much so, that it felt like I was
dragging something or its feels like a discharge battery.

I tested out this bi-metal connection compound that we use in all our
electrical connections for overhead line work. To make them less
conductive, you must apply a high pressure connection as we do using
hydraulic crimping tools.

Applying these compound on standard bolt down connections did not work for
me. I do not use any thing, except for gold plated battery connections that
provide a bi-metal connection between zinc plated battery connection and the
lead and pipe in and exhaust plenty of clean filter air. There is no
corrosion at all.

Roland

Roland

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