Robert Tellefsen wrote:
Paul
What is an AGM battery? Don't think I've heard that term before.
Thanks and 73
Bob N6WG
AGM = Absorbed Glass Mat
As I understand it, the original application was for military aircraft -
they can be mounted in any position and don't give off hydrogen under
normal circumstances. I've used the Optima 'D31M Blue Top' model in
several long-run UPS applications and they've really worked out well.
Wal-Mart marine batteries are cheaper (1/3 - 1/2 the cost of AGM) and
supposedly have more AH capacity, but the AGM batteries seem to have
significantly more capacity, last for years, and you don't have to worry
about acid spills or fumes or hydrogen. Supposedly they won't leak even
if the case gets cracked, though I haven't tested this scenario and hope
not to ;-)
There are some vendor writeups with more info at:
http://www.reactual.com/metaefficient/archives/deep_cycle_batteries/index.html
http://www.windsun.com/Batteries/AgmTech.htm
http://www.1st-optima-batteries.com/
http://www.dcbattery.com/agmtech.html
A number of eBay sellers carry these.
/Paul
--
/Paul Heller W3PH
[EMAIL PROTECTED]
http://www.his.com
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