[RE-wrenches] Battery issue

[Drake]

The charge set points were a little low.

Probably not overcharged or under (much). There may possibly have 
been a low battery incident or two. It is my suspicion, but is not 
backed by any testimony to confirm.

The location is inside where it doesn't get extremes of temperature.

At 10:46 AM 8/24/2016, you wrote:
>Hi drake,
>
>The early failure of other batteries brings up questions
>
>Charge set points?
>Frequent  overcharge, possible but damn unusual
>Frequent undercharge?
>Hi heat location?
>
>Offgrid?
>Ongrid?
>
>Battery type?
>
>Jay
>
>Peltz power.
>
>
>On Aug 24, 2016, at 7:36 AM, Drake 
><<mailto:drake.chamberlin at redwoodalliance.org>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;
>>>         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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