[RE-wrenches] Battery issue

Drake drake.chamberlin at redwoodalliance.org
Thu Aug 25 07:32:40 PDT 2016


I only supply L-16s at my cost to clients with existing banks than 
have failures. It has been hazy of course as to what is due to poor 
maintenance and what is due to defective batteries.

There was a Trojan Rep on the list. If you are still here, please chime in.


At 10:56 AM 8/24/2016, you wrote:
>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
>303 505-8760On 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
>>><mailto:dana at solarwork.com>dana at solarwork.com  - www.solarwork.com
>>>O - 970.626.5253    F - 970.626.4140   c - 208.721.7003
>>>"Responsible Technologies for Responsible People since 1988"
>>>
>>>From: RE-wrenches [ 
>>>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/>http://athens-electric.com/
>>>
>>>
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