I have installed/serviced thousands of battery based systems, I have not
seen any reversed cells either, but I know how it happens.
Here's a thought on what could cause multiple lower capacity cells in a
bank. From the moment a battery is not being charged, including newly
assembled batteries, it is self discharging and lead sulfate is forming
on the plates. If left uncharged or undercharged for months, which could
be date of assembly to date of installation, the capacity could be
affected due to ionic bonding (a level 2 sulfate bond blocking SO4 from
finishing the electrochemical process by discharging its electron to
Pb). Simply put, less surface area is available so there is less
capacity. Unless the installation date is within 60 days or less of the
manufacturing date, this could happen.
If these damaged batteries were then mixed with healthy ones, this could
account for multiple low capacity cells and the scenario I described in
my previous email would apply.
Larry Crutcher
Starlight Solar Power Systems
On 12/19/14 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.venalai...@schneider-electric.com
<mailto:jarmo.venalai...@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:*
+604-505-0291 *
Email:* _jarmo.venalainen@schneider-electric.com_
<mailto:jarmo.venalai...@schneider-electric.com> |
*Site:*_www.SEsolar.com_ <http://www.sesolar.com/> | *Address:* 3700
Gilmore Way, Burnaby, BC V5G4M1
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*** Please consider the environment before printing this e-mail
From: Corey Shalanski <cshalan...@joule-energy.com
<mailto:cshalan...@joule-energy.com>>
To: re-wrenches@lists.re-wrenches.org
<mailto:re-wrenches@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-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@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@asis.com_
<mailto:j...@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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