[RE-wrenches] Battery issue

[Tump]

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.
> On Aug 24, 2016, at 10:36 AM, Drake <drake.chamberlin at redwoodalliance.org> wrote:
> 
> 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?
> 
> At 10:01 AM 8/24/2016, you wrote:
>> Content-Type: multipart/related;
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>> 
>> How are you reading the SG?
>>  
>> __________________________________________________________
>> Dana Orzel 
>> Great Solar Works, Inc -  NABCEP # 051112-136
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>> From: RE-wrenches [ mailto:re-wrenches-bounces at lists.re-wrenches.org <mailto:re-wrenches-bounces at lists.re-wrenches.org>] On Behalf Of Drake
>> Sent: Tuesday, August 23, 2016 7:45 PM
>> To: RE-wrenches
>> Subject: [RE-wrenches] Battery issue
>>  
>> Hello Wrenches,
>> 
>> 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? 
>> 
>> What would cause this? How can the specific gravity be right?
>> 
>> Thanks,
>> 
>> Drake 
>> 
>> Drake Chamberlin
>> Athens Electric LLC
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