I have two group 27 AGM's on my boat. One is the house, and one is for
starting. AGM's have lower internal resistance than flooded batteries,
which mean they accept a charge more easily, and they also can provide
the extra current for starting without breaking a sweat. They have thin
plates, but unlike a flooded battery, they are completely supported by
the glass mat between them. That makes them immune to the vibration that
can kill flooded batteries including deep cycle versions. They are also
immune to the instant onset of sulfation when dropping water levels
expose the plates in flooded batteries to air. I am on a mooring and the
batteries are always charged to 100% with just the use of a 20 watt
solar panel and a Genasun MPPT controller. My only other charging source
is the alternator in my Yamaha outboard. The same setup with flooded
batteries had trouble reaching full charge. I do not find charging them
at all tricky. They have different needs than other types, but it really
is not at all complicated to provide what pleases them.
Bill Bina
On 2/27/2015 11:00 AM, Marek Dziedzic via CnC-List wrote:
AGMs on a mooring (or dock without shore power) without solar (or some
other way of topping up the batteries) will, quite likely, kill the
batteries very quickly (I managed to murder one in a year).
Marek
*From:* Joel Aronson via CnC-List <mailto:cnc-list@cnc-list.com>
*Sent:* Friday, February 27, 2015 10:31 AM
*To:* Joe Della Barba <mailto:j...@dellabarba.com> ;
cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
*Subject:* Re: Stus-List Batteries -- Flooded, Sealed or AGM?
If you do use AGMs, you need to keep them charged. A mooring without
a solar panel is not going to go well.
Joel
On Friday, February 27, 2015, Joe Della Barba via CnC-List
<cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:
As I said before, I am not an AGM fan. If you do decide to use
them, Sams Club has group 31 deep cycle AGMs with the Energizer
brand label. They are Deka batteries, exact same as West Marine
sells, for about 50% of the price. Think they charge around $160
for them. The Sears Diehard Platinum grp 31 AGM is a relabeled
Odyssey thin plate AGM for about half the price.
Joe Della Barba
javascript:_e(%7B%7D,'cvml','j...@dellabarba.com');
--
Joel
301 541 8551
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