[RE-wrenches] Battery Terminal Connections

[Rob Shappell]

The main reason for re-torqueing  battery fasteners is "lead creep", where
the lead terminal conforms to the pressure of the fastener and slowly creeps
away. This assumes the terminal is flat and so is the lug.  After the
terminals are "clean bright and tight" apply the Vaseline with an acid
brush. Then use a blow dryer to "melt" it into all the voids of the
connection. Can't hardly tell the terminals are coated...except no
corrosion. 

Rob

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of John Berdner
Sent: Monday, April 01, 2013 7:22 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Battery Terminal Connections

 

William:

 

I agree completely on all points.

I have also seen many bolt heads "migrate" through the battery terminals and
even split the terminal.

Washers are cheap and effective prevention.

 

Just one more thing.as an afterthought.

Stainless is a lousy conductor - NEVER put a stainless washers in the
current path, i.e. not between the terminal and the cable ends.

It might seem ok during basic testing but during a long high current charge
or discharge the stainless washer will  get very hot and bad things can
happen.

 

Best Regards,

 

John Berdner

General Manager, North America

 

SolarEdge Technologies, Inc.

3347 Gateway Boulevard, Fremont CA 94538 USA  (*Please note of our new
address.)
T: 510.498.3200, X 747

M: 530.277.4894 

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Monday, April 01, 2013 2:41 PM
To: Allan at positiveenergysolar.com; RE-wrenches
Subject: [RE-wrenches] Battery Terminal Connections

 

Friends:

In my opinion, the single most important procedure is to put a flat washer
between the bolt head and the lead flag.  

Many, many times I have seen the bolt head sink into the flag, loosening the
connection.  You know it has happened because the lead moves in around the
bolt threads and makes the bolt difficult to remove.  I saw this twice last
week, both with systems we installed, using hardware provided by the
manufacturer that did not include flat washers.  We now provide the flat
washers and use lock washers as well.

Second most important procedure:  clean, shiny, metal-to-metal connections,
torqued before any coating is applied.

William Miller

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