[RE-wrenches] AGM blew on discharge

[David Palumbo]

Drake,

Did you monitor the voltage of this cell / battery? Outside chance it had reversed polarity and was sucking energy from the other batteries. It takes a very abused battery bank for this to happen, but I've experienced it where the worst cell in a 2-volt string will flip polarity when the battery bank voltage crashes. Usually, the cell is very hot at that point too.

Dave Palumbo
________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Drake Chamberlin via RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Wednesday, July 24, 2024 10:40 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: drake.chamberlin at redwoodalliance.org <drake.chamberlin at redwoodalliance.org>
Subject: [RE-wrenches] AGM blew on discharge

A severely abused bank of Rolls Surrette batteries had one battery off gas heavily on discharge. It seems like the off gassing happens on overcharge, not discharge. What could have caused that?

Thank you,

Drake

Drake Chamberlin
Athens Electric LLC
Ohio Electrical Contractor’s License 44810
NABCEP Certified PV Installation Professional


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