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 > Another AGM conditioning question

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landyacht318

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Posted: 02/09/18 11:19am Link  |  Quote  |  Print  |  Notify Moderator

I pretty much always set the voltage on my rsp-500-15 powersupply before connecting the 45 amp Anderson Powerpoles.

Before connecting 14.7v, after connecting at 45Ah from full voltage will read 13.4, and takes abour 22 minutes to climb to 14.7v.

If the battery is nearly full, amps quickly taper to low single digits and voltage is practically instantly at 14.7v.

I do have some voltage drop on my 8awg wiring at high amperages and can twist voltage up way higher than 15v to keep 40 amps flowing for a few minutes longer, but I have to back off once it hits 14.7v.

Battery temperature also rises pretty quickly at 40 amps charge current, but spinning my voltage dial downward takes no time.

GordonThree

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Posted: 02/09/18 11:26am Link  |  Quote  |  Print  |  Notify Moderator

Is that for a healthy battery or a destroyed battery like we're talking about here?

1.9 volts total is well into the destroyed range in my book.


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Posted: 02/09/18 11:47am Link  |  Quote  |  Print  |  Notify Moderator

The correct way to charge an AGM battery is to apply 14.4 volts @ 20c and when amperage decreases to .5% to 1% of amp hour rating of the battery, the battery should be fully charged unless of course the battery is bad.

1.5 volts can be compared to a blood pressure reading of 30/7

Naio

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Posted: 03/06/18 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

Hi guys. I got too sick to deal with the agm chassis battery for an extended time, and now I am back to it. But no matter what I set the megawatt at, the amps just go up and up.

Then I turn down the megawatt til watts are about 24, and they climb again. Within two minutes, over 30. My last try was 13.18 volts.

I know above 32.4 amps will burn out the megawatt. Should I give up on this battery? Is there something else I should try?

Thanks a bunch for any advice.


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Naio

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Posted: 03/06/18 02:02pm Link  |  Quote  |  Print  |  Notify Moderator

Addendum: Megawatt now at 12.36v, amps still going up but more slowly, about 1a per 30 seconds or so.

BFL13

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Posted: 03/06/18 02:04pm Link  |  Quote  |  Print  |  Notify Moderator

What is the battery temperature doing?

If amps climb after charging for a while instead of tapering, then the extra amps are going towards heat. Such as when an AGM is fully charged but you leave the voltage up instead of reducing to Float voltage.

Mex mentioned battery heating previously. IMO be very careful not to overheat an AGM. ISTR Mex said if it heats up but won't hold a charge it is toast for sure?


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Posted: 03/06/18 02:05pm Link  |  Quote  |  Print  |  Notify Moderator

Take it off charge

Wait one hour

What is the voltage reading?

Naio

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Posted: 03/06/18 02:11pm Link  |  Quote  |  Print  |  Notify Moderator

Okay Max, will do. Starting was around 1.8 volts or something.


BFL, I don't think heat is an issue, although I'm not a hundred percent sure.

The top of the battery and the terminals are slightly warm, but I could keep my hand on them all day. And it's been in the direct sun for an hour.

Naio

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Posted: 03/06/18 02:11pm Link  |  Quote  |  Print  |  Notify Moderator

Thank you, both!

Naio

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Posted: 03/06/18 03:00pm Link  |  Quote  |  Print  |  Notify Moderator

6.8v. Now what?

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