[RE-wrenches] Charging AGM Batteries

[Tump]

Surrette battery has just come out w/ their newest product.....AGM
batteries. They also have quite a paper on charging these units. Perhaps
someone at Surrette or their web site has the "Rolls AGM Battery Charging
Instructions" if not contact me off list.TUMP
 
 
     <mailto:Tump at swnl.net> Tump at swnl.net         <http://www.swnl.net/>
www.SWNL.net
           Solarwinds Northernlights   
   Serving Mid Coast Maine & Northern California
     Me.# 207-832-7574  Cl.#  610-517-8401
 
                          Blair "TUMP" May
      ********  MAINE'S CHARTER ********
            NABCEP    "Certified PV Installer" 
   
      ********  MAINE'S CHARTER ********
   Trace Xantrex "Certified" Dealer / Installer"
   
  

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Bell, Steve
Sent: Tuesday, September 15, 2009 10:42 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Charging AGM Batteries



Hi Peter,

 

At least some AGM’s (like the Concorde) can handle very aggressive charging
rates, provided you have good temperature compensation to reduce the
possibility of a thermal runaway.

 

Also the 14.6 VDC is a little higher than recommended, at least for the
Concorde brand. 14.4 VDC (2.40 V per cell) is the recommended max.  BTW,
Concorde has a great Technical manual about their AGM’s; much of which
applies to most quality AGM’s. You can download it from their web site.
www.concordebattery.com <http://www.concordebattery.com/> 

 

Steve

  

Steve Bell

Technical Support Specialist 

 

SunWize Technologies, Inc.

#1 Sun Street

Stelle, IL  60919 USA

(815) 256-2222 ext. 23

sbell at sunwize.com

www.sunwize.com <http://www.sunwize.com/> 


  _____  


From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Peter
Parrish
Sent: Tuesday, September 15, 2009 9:33 AM
To: 'RE-wrenches'
Subject: [RE-wrenches] Charging AGM Batteries

 

I have been told that AGM batteries can withstand pretty aggressive charging
rates, with a bulk rate being ½ of C/20. For example a MK 8A8D, with a C/20
of 245 A-h, would start with 122 A. If this is okay, can I still use the
standard 14.6 V value for switching from Bulk to Absorb? What about ambient
temperature effects at high charge rates?

 

We have need from time to time to charge AGMs as quickly as we can safely do
so, so any information on high charge rates would be appreciated.

 

- Peter

 




Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP TM Cert. 031806-26
peter.parrish at calsolareng.com  
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885


  

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