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 sb...@sunwize.com www.sunwize.com <http://www.sunwize.com/> ________________________________ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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.parr...@calsolareng.com Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
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