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Drake,</div>
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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.</div>
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Dave Palumbo</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Drake Chamberlin via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Wednesday, July 24, 2024 10:40 AM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> drake.chamberlin@redwoodalliance.org <drake.chamberlin@redwoodalliance.org><br>
<b>Subject:</b> [RE-wrenches] AGM blew on discharge</font>
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<div class="x_pre" style="margin:0; padding:0; font-family:monospace"><span style="font-size:12pt">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?</span><br>
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<span style="font-size:12pt">Thank you,</span><br>
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<span style="font-size:12pt">Drake </span><br>
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Drake Chamberlin<br>
Athens Electric LLC<br>
Ohio Electrical Contractor’s License 44810<br>
NABCEP Certified PV Installation Professional<br>
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