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14-06-2013, 09:31
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#1
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Registered User
Join Date: Jun 2010
Location: Sint Maarten / Saint Martin
Boat: Caliber47LRC - MAKAI
Posts: 78
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AGM Battery - Very Hot and Sulfur Smell
Hello,
We have 3 AGM 6 cells house batteries which are 2 years old, 200Amps each. Until recently they all worked very well. They are connected parallel.
The other day, we noticed one of the batteries being less charged than others and not accepting the charge well. When touched it felt much warmer than the others and we could smell something like sulfur. We've taken this battery out of our electrical circuit but would like to understand what happened to prevent it from happening again.
We do not think our batteries were ever overcharged. Our voltage has never been above 14.10V and suspect this battery had developed some internal resistance. How can we make sure that this is the case and that our alternator or generator is indeed not overcharging?
Also, before the battery started smelling, our voltage seemed to dip unusually fast and we suspect this one battery was draining the other ones.
Any help is appreciated.
Thanks
Vincent
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14-06-2013, 09:48
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#2
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: AGM battery - Very hot and sulfur smell
faulty cell,
dave
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Interested in smart boat technology, networking and all things tech
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14-06-2013, 09:50
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#3
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Registered User
Join Date: Jul 2005
Location: Bellingham
Boat: Outbound 44
Posts: 9,319
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Re: AGM battery - Very hot and sulfur smell
Not sure what brand of battery you have, but it sounds like they have been undercharged. A Lifeline AGM charges at 14.4 at 70*F. My Rolls AGM need closer to 14.7v. So sulphation is real likelihood.
__________________
Paul
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14-06-2013, 09:55
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#4
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Registered User
Join Date: Mar 2013
Location: South Jersey
Posts: 361
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Re: AGM battery - Very hot and sulfur smell
get an inexpensive Harbor Freight volt meter. the digital red one is good and you can find a coupon for a free one.
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14-06-2013, 11:05
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#5
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CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
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Re: AGM battery - Very hot and sulfur smell
Quote:
Originally Posted by VVD
Also, before the battery started smelling, our voltage seemed to dip unusually fast and we suspect this one battery was draining the other ones.
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I had the same thing happen with a gel battery. It was a bad cell.
__________________
cruising is entirely about showing up--in boat shoes.
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14-06-2013, 11:49
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#6
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Eternal Member
Join Date: Jul 2006
Posts: 4,046
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Re: AGM battery - Very hot and sulfur smell
I agree with the undercharging and sulfating comment....14.1VDC is way too low for charging an AGM or flooded lead acid battery.
However, sulfation by itself is unlikely to cause a shorted cell, and this sounds like a bad one.
More likely to be some sort of internal physical anomaly, maybe with the rods connecting the plates or other plate-related problem???
Anyway, there's really no way to protect batteries 100% from such failures. Charge 'em at the correct voltages, keep them fully charged as often as possible, don't cycle them too low, don't mistreat them, and that's about all you can do. But, nothing is 100%!
Bill
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14-06-2013, 11:55
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#7
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: AGM battery - Very hot and sulfur smell
AGMs really have no place on a boat, see the many posts on them elsewhere IMHO
dave
__________________
Interested in smart boat technology, networking and all things tech
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14-06-2013, 12:30
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#8
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Registered User
Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
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Re: AGM battery - Very hot and sulfur smell
Quote:
Originally Posted by goboatingnow
AGMs really have no place on a boat, see the many posts on them elsewhere IMHO
dave
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Could you live with a vented battery inside the cabin?
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14-06-2013, 12:30
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#9
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: AGM battery - Very hot and sulfur smell
Quote:
Could you live with a vented battery inside the cabin?
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I live with 8 of them!
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Interested in smart boat technology, networking and all things tech
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14-06-2013, 12:39
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#10
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Senior Cruiser
Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,306
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Re: AGM battery - Very hot and sulfur smell
Quote:
Originally Posted by goboatingnow
I live with 8 of them!
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Well I only have six at the moment.
Have used standard FLA vented batteries on every boat I've every owned and same for almost every boater I know. Haven't had a hydrogen explosion yet at least on a boat. I did have a sealed dive light with a bad battery vent hydrogen and make a pretty loud pop when I opened it and the leads sparked but I don't know of any battery boxes that are sealed that tight.
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The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
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14-06-2013, 12:42
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#11
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: AGM battery - Very hot and sulfur smell
hydrogen rises, and vents in typical boat, where most are not using sealed battery cases. I dont see it as a problem,
Anyway, you can easily get VRLAs that are not AGM, is you wanted sealed,but in my opinion backed upo by people like Sterling Power, Open , flooded LA is best for boats.
dave
__________________
Interested in smart boat technology, networking and all things tech
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14-06-2013, 13:04
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#12
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Registered User
Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
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Re: AGM battery - Very hot and sulfur smell
I would truly like to save some money. I have 7 dead batteries 3 of which are inside the cabin and 4 outside. Till now I felt that because of the 3 inside I was forced to use non vented batteries, like the AGM's. I imagined the gas and smell from charging batteries would be unpleasant and a danger. I can easly seal up the battery boxes that are inside so whatever gas was present would stay there but is that wise?
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14-06-2013, 13:46
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#13
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CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
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Re: AGM battery - Very hot and sulfur smell
Quote:
Originally Posted by goboatingnow
AGMs really have no place on a boat, see the many posts on them elsewhere IMHO
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Huh. There's a real nice place for them on my boat.
__________________
cruising is entirely about showing up--in boat shoes.
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15-06-2013, 05:01
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#14
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Quote:
Originally Posted by Bash
Huh. There's a real nice place for them on my boat.
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They contain advantageous that can't be utilised and disadvantageous that unfortunately materialise
Dave
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Interested in smart boat technology, networking and all things tech
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15-06-2013, 05:03
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#15
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Quote:
Originally Posted by Guy
I would truly like to save some money. I have 7 dead batteries 3 of which are inside the cabin and 4 outside. Till now I felt that because of the 3 inside I was forced to use non vented batteries, like the AGM's. I imagined the gas and smell from charging batteries would be unpleasant and a danger. I can easly seal up the battery boxes that are inside so whatever gas was present would stay there but is that wise?
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I charge 8 LA s there is no noticeable smell in the boat from the batteries at any time. You're worrying about a problem that doesn't exist. Don't seal the boxes as the has collects in the smaller spaces
Dave
__________________
Interested in smart boat technology, networking and all things tech
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