[RE-wrenches] Battery issue

[Jay]

Ha that's a good one. 

But still good to know if they were murdered or had defects. 

While I also have had early failures on every brand, that's earlier than most I've seen
Usually it's outside of warranty, of course. 

Jay

> On Aug 24, 2016, at 7:56 AM, Ray Walters <ray at solarray.com> 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
> 303 505-8760
>> 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;
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>>> 
>>> How are you reading the SG?
>>>  
>>> __________________________________________________________
>>> Dana Orzel 
>>> Great Solar Works, Inc -  NABCEP # 051112-136
>>> 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/ 
>>> 
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