<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">This is a premature failure, possibly a manu defect and may be addressed under a prorated wttee. That being said corrosion in a L16 type of battery can be caused by customer over filling the battery causing excessive electrolyte to stay on the top of the battery or bad post seal. in older batteries excessive internal cell pressure, caused by heavy charging cycles causing the vent in the cap to become plugged w/ lead sulfate, forcing gas out around the post seal. I would say that this is the leading cause of corrosion. Check w/ Trojan and see if they are interested in a warrantee.<div class=""><div class=""><div class=""><div><blockquote type="cite" class=""><div class="">On Aug 24, 2016, at 10:36 AM, Drake <<a href="mailto:drake.chamberlin@redwoodalliance.org" class="">drake.chamberlin@redwoodalliance.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<div class="">
The batteries were tested with a glass bulb, turkey baster type
hydrometer. The SG read higher than the scale on all the batteries. The
electrolyte was clear. The batteries were not too old, maybe three years,
with some newer ones, as others in the bank had failed. The corrosion was
notable. I did not install the batteries, so don't know if the battery
jumpers were cleaned at installation. Could terminal corrosion have
aggravated the problem in anyway?<br class=""><br class="">
At 10:01 AM 8/24/2016, you wrote:<br class="">
<blockquote type="cite" class="cite" cite="">Content-Type:
multipart/related;<br class="">
<x-tab class=""> </x-tab>
boundary="----=_NextPart_000_0010_01D1FDDD.B1B27F40"<br class="">
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How are you reading the SG?<br class="">
<br class="">
__________________________________________________________<br class="">
<b class="">Dana Orzel</b> <br class="">
Great Solar Works, Inc - NABCEP # 051112-136<br class="">
<a href="mailto:dana@solarwork.com" class="">dana@solarwork.com</a> -
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<b class="">From:</b> RE-wrenches
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" eudora="autourl" class="">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b class="">On Behalf Of
</b>Drake<br class="">
<b class="">Sent:</b> Tuesday, August 23, 2016 7:45 PM<br class="">
<b class="">To:</b> RE-wrenches<br class="">
<b class="">Subject:</b> [RE-wrenches] Battery issue<br class="">
<br class="">
Hello Wrenches,<br class=""><br class="">
I was analyzing a string of 8 Trojan L-16 batteries with badly corroded
terminals. The specific gravity read perfect on each battery. Two of the
batteries read low voltage; about 4.2 volts.It seems like one cell's
worth of voltage wasn't showing up on each battery. Has anyone seen this
before? <br class=""><br class="">
What would cause this? How can the specific gravity be right?<br class=""><br class="">
Thanks,<br class=""><br class="">
Drake <br class=""><br class="">
Drake Chamberlin<br class="">
<i class="">Athens Electric LLC<br class="">
OH License 44810<br class="">
CO License 3773<br class="">
NABCEP Certified Solar PV <br class="">
740-448-7328<br class="">
</i><a href="http://athens-electric.com/" class="">http://athens-electric.com/</a>
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