[RE-wrenches] Battery Terminal Connections

[John Berdner]

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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