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 > Another AGM conditioning question

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Naio

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Posted: 02/08/18 02:22pm Link  |  Quote  |  Print  |  Notify Moderator

This poor battery is at 1.9v [emoticon] [emoticon] [emoticon]. I don't suppose is lokely to live no matter what I do. Is 45aH


3/4 timing in a DIY van conversion. Backroads, mountains, boondocking, sometimes big cities for a change of pace.


Naio

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Posted: 02/08/18 03:41pm Link  |  Quote  |  Print  |  Notify Moderator

Got the meanwell on there. It is taking 19amps at 14.08v. I am afraid to turn it up.

Naio

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Posted: 02/08/18 03:49pm Link  |  Quote  |  Print  |  Notify Moderator

7 minutes later, 35 amps at 13.78v. Terminal warm, not hot, don't have my temperature gun. Bwackk! I am chickening out if Mex is not here.

GordonThree

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Posted: 02/08/18 05:13pm Link  |  Quote  |  Print  |  Notify Moderator

There's no way to replace lost electrolyte in an AGM. I've tried desulfating smaller ones that I've salvaged from computer equipment, never had success. I even went so far as to drill out the seals so I could use a needle to replace electrolyte.

35 amps into a 45ah battery doesn't sound healthy.

Are you seeing any steam from the vents, or rotten egg smell of electrolyte? Could be the battery is already dry.


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MrWizard

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Posted: 02/08/18 05:14pm Link  |  Quote  |  Print  |  Notify Moderator

Naio wrote:

When I was using the meanwell on the first of the fiamms, I set it at 14.7 but it went up to 15.2 before I realised.


set the voltage on the meanwell "BEFORE" you connect it to the battery

on the battery it will be lower to start, but rise to the proper voltage and NOT go over


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pianotuna

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Posted: 02/08/18 08:40pm Link  |  Quote  |  Print  |  Notify Moderator

Naio,

Battricide. Such a shame.

You have nothing to loose by trying to "Frankenstein" this jar.


Regards, Don
Full Time in a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Naio

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Posted: 02/08/18 10:32pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks, guys!

No steam from the vents, or rotten egg smell. But is there a chance it could, like, explode...? That's what scared me.

MrWiz, can I really set the voltage on the meanwell if it is not hooked to a battery?

MEXICOWANDERER

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Posted: 02/09/18 12:13am Link  |  Quote  |  Print  |  Notify Moderator

Power supplies have a voltage slump of up to .20 volts between not connected and finished charging voltage.

So if the battery eats more than the charger can supply of course the voltage seen would be much less than what it was set at before connecting

Perfectly fine. Set voltage to 14.40 volts disconnected. Disconnect battery from the circuit then start the music.

Check the battery after a half hour with the palm of your hand. Unequal heating across all cells is a death knell -- cease charging and prepare for disposal.

120F is tops for permitted battery temp. I cannot continue to hold my hand against a 120F object, but it is definitely not a "Ouch! ****!" experience.

No danger of anything bad happening after you do your first and second check for overheating. Not at 14.40 volts.

If voltage fails to rise a minimum of .1 volt per hour with a charger amp hour relationship you noted, the battery is bad.

Heat is a great tattletale. Uneven heating across the battery cells is a dead giveaway. Heat F rising with little voltage gain is another. Music. Amazing Grace.

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Posted: 02/09/18 07:15am Link  |  Quote  |  Print  |  Notify Moderator

A couple of reminders:
An AGM battery typically does not "sulphate"......much.
It also does not lose water from electrolysis; thus no vents.

That is under "normal" conditions.
If severely abused, all bets are off.

As for the battery in question here, you now "have it's attention" and it would be best now to switch to a low capacity tender for a few days and see what happens. While it is not likely, bad things can happen at high charging rates like that if, for instance, a plate shorts out.

I still don't think it is worth messing with. Even if the voltage comes back up, it likely won't be able to supply anywhere NEAR it's rated capacity anymore.


'07 Damon Outlaw 3611
CanAm Spyder in the "trunk"

Naio

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Posted: 02/09/18 10:57am Link  |  Quote  |  Print  |  Notify Moderator

Thank you, Mex! I needed that info [emoticon]. It may be a few days before I can get back there, fyi.

PS, How are you doing??? Are you back home?

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