AGM battery strings: Problems? [RE-wrenches]

[Jim Easton]

Possibility of problems? Yes.

Paralleling batteries of dissimilar type/history can lead to premature
failure & lack of anticipated capacity.

A better solution might be to use an A-B switch with a battery isolator for
charging.

Jim Easton
Alternative Energy Technologies
CSL: 852243
9465-B Mission Park Place
Santee, CA 92071
Tel: 619-262-8800
Fax: 619-562-8811
Cell: 858-527-0240

-----Original Message-----
From: Kelly Keilwitz [mailto:kelly at whidbeysunwind.com] 
Sent: Thursday, November 30, 2006 8:20 AM
To: RE Wrenches listserve
Subject: AGM battery strings [RE-wrenches]


Wrenches,
Recent grid outages here have a few of our grid-connected, battery-based
customers wanting more battery capacity. Two of the systems have Concorde
AGM's in single, 48-volt strings. I'd like to take the 2-mo old, 104AH
(24-hr) set from one system and add it to the 6-mo old, 89AH set in another
system.
Do you see any problems with paralleling these different capacity strings?
Should I cable individually from each string (2+ & 2-), or will simple,
reverse return (1+ & 1-) flow be sufficient?

Thanks,
-Kelly


Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd, 
Coupeville, WA 98239
PH & FAX 360-678-7131
sunwind at whidbeysunwind.com
 


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