[RE-wrenches] Magnum System - Discharged Battery Bank

[Ray Walters]

I have only seen this in cases with DC loads and no LVD.  Inverter 
systems without DC loads would never exhibit this behavior, unless there 
was a short in the battery cabling or bad cells.

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

On 12/19/2014 12:23 PM, Jay Peltz wrote:
> I find it really curious.
> I've been dealing with batteries for almost 20 yrs. I've seen so many 
> dead, flat batteries, systems etc I can't count them all.
> But I've yet to find a reversed one.
> I understand the process.
>
> I'm trying to understand how he could get multiple reversed batteries 
> at one go?
>
> Jay
> Peltz power
>
>
> Sent from my iPhone
>
> On Dec 19, 2014, at 9:47 AM, Jarmo.Venalainen at schneider-electric.com 
> <mailto:Jarmo.Venalainen at schneider-electric.com> wrote:
>
>> Hi:
>>
>> This cell reversal ability of lead acid batteries gives good 
>> perspective on just how much you can mistreat them and beat them up 
>> and still have an expectation of "recovery".
>>
>> Lithium cells on the other hand without a full range of protections 
>> would have long since filled the home with all kinds of interesting 
>> high temperature thermal events, gaseous compounds and chemicals, and 
>> there is no way you could get that magic smoke back into them.
>>
>> JARMO
>> _____________________________________________________________________________________
>> *
>> Jarmo Venalainen*  | *Schneider Electric **|  Solar Business*  | 
>> *CANADA*  | *Training & Development Specialist - Senior* *
>> Phone:* +604-422-2528  | *Fax:* +604-420-1591  | *Mobile:* 
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>> Email:* _jarmo.venalainen at schneider-electric.com_ 
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>>
>> From: 	Corey Shalanski <cshalanski at joule-energy.com 
>> <mailto:cshalanski at joule-energy.com>>
>> To: 	re-wrenches at lists.re-wrenches.org 
>> <mailto:re-wrenches at lists.re-wrenches.org>,
>> Date: 	12/19/2014 06:48 AM
>> Subject: 	Re: [RE-wrenches] Magnum System - Discharged Battery Bank
>> Sent by: 	"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org 
>> <mailto:re-wrenches-bounces at lists.re-wrenches.org>>
>>
>>
>> ------------------------------------------------------------------------
>>
>>
>>
>> Update on my investigation:
>> I visited the customer's house yesterday to set up a pulse charger. 
>> Much to my surprise the three batteries that originally registered 
>> negative voltage are now reading positive. Does this make sense - are 
>> batteries able to shift between negative and positive voltages at 
>> such a low charge level?
>>
>> I do not see any evidence of distorted cases.
>>
>>
>> On Thu, Dec 18, 2014 at 7:58 AM, <_jay at asis.com_ 
>> <mailto:jay at asis.com>> wrote:
>>
>> I second tump.
>> Most likely a bad /cell battery took out the system.
>> As these are VRLA batteries, I'm curious do,the cases look damaged 
>> such as expanded or sunk in?
>>
>> Jay
>> Peltz power
>>
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