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Battery Voltages?

Old 01-07-2012, 08:55 AM
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Default Battery Voltages?

Got 3 Odyssea 2150 AGM's that were Left, house and right respective on a dual outboard three switch setup,
all were charged from engines, house from the combined secondary engine outputs.

pulled them and charged in parallel overnight, Auto charger
and once disconnected from each other, immediate voltages are 12.72, 12.68 and 12.62
(Boat is out of water, fuel empty etc, want to clean out console and do some TLC)
I'll check volts again after a few hours

Are these voltages within tolerance for these to now be used as a single 12v house bank?

Want to avoid a pull down situation within a bank if I re-use them this way.
Old 01-07-2012, 10:20 AM
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all fine:

http://www.veradoclub.com/smf/index.php?topic=59.0
Old 01-07-2012, 12:05 PM
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Thanks Glen E,
Perhaps the fact that they were separate in the other boat accounts for the small voltage diff,
Currently I'm charging the two with lower Voltage together, see if their voltage comes up to par with the third one.
Car charger prob isn't the best for AGM's either, but where they're going there is a 3 bank Xantrex with settings for AGM, GEL, and flooded.

If the other bank is Gel,(diesel starting 2x D8's) and this bank will be AGM (3 Ody 2150's), what charger setting do you think is best? Safest?
Old 01-07-2012, 02:17 PM
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dunno...gel is something I won't get near....
Old 01-07-2012, 03:10 PM
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Why is that?

The gels are starting batts for a single diesel, the three AGMs are replacing three maint. free flooded group 31's (Exides) as house, I'll add another or two later.
Haven't had issues with any so far but have added loads to the boat and we live aboard for a month at a time. (12v freezer,compressors x 2) Gen on board but it is nice not to run over night sometimes esp if AC isn't needed.
CA on the flooded is 950, I think 1150 on the AGMs, plus longer reserve at 25A
Old 01-07-2012, 03:12 PM
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I have a few Odysseys as well after migrating from Lifeline, full charge on the Odyssey range is 12.84. If the readings you got were taken straight after charging they are not indicative of the state of charge you have, radings should be taken after batteries are left to stand for 6-8 hours.
I wouldn't be charging a gel battery with AGM's as the charging currents are different for each type, only charge same with same.

Odyssey put out an owners manual which you should read:
http://www.odysseyfactory.com/docume...M-009_0611.pdf

Tony
Old 01-07-2012, 03:17 PM
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AGM and flooded cell batteries are compatible with each other. Neither is compatible with gel batteries. They take different charging voltages and rates.

Unless someone is giving you free gel batteries, you're better of with the other types.
Old 01-07-2012, 03:19 PM
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Originally Posted by Capt Odyssea View Post
Got 3 Odyssea 2150 AGM's that were Left, house and right respective on a dual outboard three switch setup,
all were charged from engines, house from the combined secondary engine outputs.

pulled them and charged in parallel overnight, Auto charger
and once disconnected from each other, immediate voltages are 12.72, 12.68 and 12.62
(Boat is out of water, fuel empty etc, want to clean out console and do some TLC)
I'll check volts again after a few hours

Are these voltages within tolerance for these to now be used as a single 12v house bank?

Want to avoid a pull down situation within a bank if I re-use them this way.
That's not a big difference. For a more accurate reading, connect a small load to each battery for an hour or so, then measure. Something like a car dome lamp. .1 amp or so.
Old 01-07-2012, 03:42 PM
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Boat came new with Maint free flooded and gels, Xantrex three x 40A output charger,
I believe the battery type selector is global to all outputs though

So going to AGM and GEL could cause issues like premature failure? and of which?

I'll read the Odyssey manual, I know the Gels are Victron, two big ones, prob D8's

I don't think the Exides are anything special, be cheapear to add a couple of them but I've got the Odysseys......
More research needed it seems.
Old 01-07-2012, 04:48 PM
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Originally Posted by Capt Odyssea View Post
Boat came new with Maint free flooded and gels, Xantrex three x 40A output charger,
I believe the battery type selector is global to all outputs though

So going to AGM and GEL could cause issues like premature failure? and of which?

I'll read the Odyssey manual, I know the Gels are Victron, two big ones, prob D8's

I don't think the Exides are anything special, be cheapear to add a couple of them but I've got the Odysseys......
More research needed it seems.
You can get good information on the different battery types and charging requirements with a web search. More than what you're going to get on a boating forum.

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