[RE-wrenches] 24 volt Battery Bank comparison

Tue May 31 15:32:24 PDT 2011

My one string of 1476 AH IBE 2 V cells went 19 years before retiring them to
a neighbor's off grid system, where they are now working.

One string has my vote!

Sincerely,

Chris Worcester

Solar Wind Works
NABCEP Certified PV Installer
Phone: 530-582-4503
Fax: 530-582-4603
www.solarwindworks.com <http://www.solarwindworks.com/> 
chris at solarwindworks.com
"Proven Energy Solutions"

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Brian
Mehalic
Sent: Tuesday, May 31, 2011 3:25 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] 24 volt Battery Bank comparison

Hi Wayne-

While I think a lot of folks will agree that a single string is better for
the long term health of the batteries as it results in more even charging, I
still like the idea of at least two strings.  That way if a single battery
fails, that string can be removed and the end-user can at least get by on
half of the pack until a replacement can be installed.

Brian

On Tue, May 31, 2011 at 10:19 PM, James Surrette <james at surrette.com> wrote:

Hi Wayne, 

I look forward to the input from the wrenches. 

My recommendation, regardless of the brand, would be for one string. 

Regards, 

Jamie

>>> Wayne Irwin <wayne at pureenergysolar.com> 5/31/2011 6:49 PM >>>
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 
Wayne at PureEnergySolar.com <mailto:PureEnergySolar at hotmail.com> 
http://pureenergysolar.com <http://pureenergysolar.net/> 
352 377-6527 Office
352 336-3299 Fax
352 316-1637 Cell

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-- 
========================
Brian Mehalic 
NABCEP Certified Solar PV InstallerT R031508-59

IREC ISPQ Certified Affiliated Instructor/PV US-0132

PV Curriculum Developer and Instructor

Solar Energy International
Carbondale, CO 81623
http://www.solarenergy.org

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