[RE-wrenches] Trojan Batteries

Thu Aug 13 07:18:53 PDT 2015

Hi:

It occurred to me that with all the experience on the Wrenches community, 
we have a unique opportunity to get perspective on one aspect of battery 
bank natural aging and failure.

Which cells typically fail first,

A. The cells on the end of the strings
B. The cells in the middle of the strings
C. Random cells in any position.

If there is a pattern to failures among a large group of systems, then 
that will support cell rotation.  If not, then not.

JARMO
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From:
Drake <drake.chamberlin at redwoodalliance.org>
To:
RE-wrenches <re-wrenches at lists.re-wrenches.org>, 
Date:
08/13/2015 07:03 AM
Subject:
Re: [RE-wrenches] Trojan Batteries
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>

Most failures have been in one string of 4 or 8 batteries. One failure was 
in two strings of 4. 

At 10:26 PM 8/12/2015, you wrote:
What size are the banks are are they series/paralleled across the 
terminals?  That can cause one or more cells to fail, generally starting 
on the negative terminal.  The set that failed on me was series/parallel 
across the terminals, old school, and the cell closest to the main 
negative overheated and shorted out, killing that string.  Itâ€™s why I 
went to buss bars.

Tom

From: Drake 
Sent: Wednesday, August 12, 2015 12:03 PM
To: re-wrenches at lists.re-wrenches.org 
Subject: [RE-wrenches] Trojan Batteries

Hello Wrenches,

I have had a number of customers with Trojan L-16s have problems lately. 
In some cases, I know that the batteries weren't very well cared for, but 
in no case were the batteries totally discharged and let get cold or sit 
for a long time. It doesn't seem that the batteries should have died after 
a couple of years. I could see diminished output and a reduced life. 

One customer who supposedly knows someone with inside information claims 
that Trojan started cutting corners a few years ago to be more competitive 
on price. 

Has anyone else seen more problems with Trojan Batteries, or heard that 
the company is cutting corners?

Thanks,

Drake 

Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV 
740-448-7328
http://athens-electric.com/ 

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