[RE-wrenches] Trojan Batteries

William Dorsett wmdorsett at sbcglobal.net
Thu Aug 13 08:46:00 PDT 2015


Michael, does HP or SolarPro have a format for compiling the type of data that Jarmo is asking?  …a Doodles.com survey type of form that could be accessed through the wrenches archives or similar? I’ve thought for a long time that different comparisons over time for: i.e. customer service, module or inverter failure rates or changes in tech support would be helpful to the whole renewable energy community.

 

Bill Dorsett

Manhattan, KS

 

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jarmo.Venalainen at schneider-electric.com
Sent: Thursday, August 13, 2015 9:19 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Trojan Batteries

 

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.  It’s why I went to buss bars.

Tom

From: Drake <mailto:drake.chamberlin at redwoodalliance.org>  
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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