.... try disconnecting all strings from each other... (check all electrolyte levels and Specific Gravity).. let them rest for a while... and compare individual battery voltages... you're looking for about 2 volt differences... (bad cells)... basically you're up against an ohm's law thing... higher Resistance (Impedance is an AC thing), less current.... I'd be looking for sulphation or a bad connection.... you may be able to eq each string individually, then recombine them... (Be sure to do your homework).. might be an aging battery thing... depending on, depending on, generally if they're over like 5 years old, their number may well be on the board. good luck. db
Dan Brown
Foxfire Energy Corp.
Renewable Energy Systems
(802)-483-2564
www.Foxfire-Energy.com
NABCEP #092907-44
-------- Original Message --------
Subject: [RE-wrenches] Imbalance In Multiple String Charging Current
From: "Mark Frye" <[email protected]>
Date: Thu, July 22, 2010 1:30 pm
To: "'RE-wrenches'" <[email protected]>
Folks,I have three strings of batteries cabled in parallel to a common buss bar.During charging, one string takes significantly less current than the others.What can I infer from this? Is the low current string healthier, presenting higher impedance due to a higher state of charge? Or is there a single bad cell with high impedance in this string? Both, neither, something else, or can't know without further information?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com
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