[RE-wrenches] 24 volt Battery Bank comparison

[Tom Elliot]

>From a reliability standpoint I would never want to bet the farm on one string.  All it takes is the failure of one cell and the system is useless until it is replaced.  Three strings means a cell failure only reduces capacity by 33% not 100%.  I’ve always thought in off-grid systems it is a good idea to build in as much redundancy as possible whenever possible.  Oh, and always use a buss bar system with multiple strings, it makes for a far more stable system with less stress on the batteries.

Tom



From: Wayne Irwin 
Sent: Tuesday, May 31, 2011 11:49 AM
To: Wrenches 
Subject: [RE-wrenches] 24 volt Battery Bank comparison

Hello Esteemed Battery Gurus,

Which of the following do you believe is the better 24 V battery bank?

A) 13 - Rolls 2-YS-31 2430 AH @ 20 HR (one string) 

or 

B) 9 -  Rolls 8-CS-25P 820 AH @ 20 HR (3 strings of 3)

Thank you in advance for your input!


Wayne Irwin, EE
Director of Engineering
Pure Energy Solar International Inc. 
State Licensed Solar Contractor
License # CVC56695 
mailto:PureEnergySolar at hotmail.com 
http://pureenergysolar.com 
352 377-6527 Office
352 336-3299 Fax
352 316-1637 Cell

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