On Thu, 12/8/16, Bill Kinney greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: Re: [Amel Yacht Owners] Charging AGM batteries
To: amelyachtowners@...
Date: Thursday, December 8, 2016, 11:12 AM


 









Because of their internal
construction a full on classic thermal runaway is MUCH less
likely to occur with good agm batteries. Lifeline claims
they have never heard of it happening to their batteries.
You can however, melt them down if the voltage is too high
for too long causing the electrolyte to boil
off. 
Monitoring is
simple. Fully charge, disconnect the charge and load, and
then check voltage after a bit of time to rest. A shorted
cell will quickly pull the voltage for that one battery down
to 10.5. Otherwise, capacity testing and such can be the
same as a flooded battery. 
You'll also see a bad cell in
your charging amps at full charge. They'll never drop
down to the 0.3 amps or so that they should at the correct
float voltage when the batteries are full. 
Bill Kinney

On Dec 8,
2016, at 11:27, Kent Robertson karkauai@...
[amelyachtowners] <amelyachtowners@...>
wrote:
















 






Wow! You were lucky you didn't have a
fire. I don't know the charge settings for AGM
batteries, but whenever you hook your new batteries up you
need to monitor the 30 amp charger closely. It's
entirely possible that you have a fault in your charger.
 This is just another example of why it is so important to
monitor your batteries closely. With AGM's I don't
know how you can monitor the batteries like you would
specific gravity in a flooded lead acid battery. I would
like to hear about this.
Since my last battery
mishap, I have quit leaving my charger on constantly while I
am off the boat. I have instead hired someone to come aboard
once a week to flush the Watermaker membranes and top the
batteries up with a 2 hour charge.

Kent
Sent from my
iPad
On Dec 8, 2016, at 9:47 AM,
sharongbrown@...
[amelyachtowners] <amelyachtowners@...>
wrote:
















 






Hi,
I just came back to my boat
after three months and found that my entire bank of 12 AGM
batteries melted. I had left the 30A charger running. I am
in the processing of replacing them with new AGM batteries
(can't get anything else where I am in Grenada). I have
an Amel 54 #98 with Dolphin 100A and 30A chargers. Would
someone be able to advise which is the correct charge
setting I should  use on these chargers for charging AGM
batteries?
Thanks,PaulS/Y
Ya Fohi Amel 54 
































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