[RE-wrenches] Battery issue

Ray Walters ray at solarray.com
Wed Aug 24 07:56:56 PDT 2016


Trojan L 16s have a known issue with premature cell failures.  The T105s 
seem to still be fine, but I won't sell the L16 anymore.
SG readings don't even matter when you have an obvious cell failure.  
Its like doing blood work on a corpse.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 8/24/2016 8:36 AM, Drake 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;
>> boundary="----=_NextPart_000_0010_01D1FDDD.B1B27F40"
>> Content-Language: en-us
>>
>> 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
>> OH License 44810
>> CO License 3773
>> NABCEP Certified Solar PV
>> 740-448-7328
>> /http://athens-electric.com/
>>
>>
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