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All About Batteries, Part 3: Lead-Acid Batteries

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David Ashton
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Re: SLABs
David Ashton   1/15/2014 12:57:16 AM
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Thanks Ivan.   Could you also comment on the many designs - both commercial and presented as DIY projects - that claim to recover capacty in used batteries?  As far as I can tell they seem to work by a very short high overcharge, I think to get rid of sulphation, but I may be wrong.  Are any of these worth anything?

eetcowie
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Re: SLABs
eetcowie   1/15/2014 10:03:57 AM
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I have found that quite often, batteries can be recovered. Here are some I found:

http://www.youtube.com/watch?v=1xvr3Sc3g2o

http://www.youtube.com/watch?v=Supe1a3LW2U

The best, are with reconditioning the flodded-cell liquid. Some capacity can be done with careful overcharging.

DrFPGA
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Thanx for the link to the BIC
DrFPGA   1/16/2014 12:36:53 PM
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will be following their work. Reading over the Grants is particularly enlightening. BIC seems similar to the program the government just launched to drive innovation... Wonder if there is/will be a connection.

Bugfighter
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Rookie
Charging
Bugfighter   1/17/2014 4:39:32 AM
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Thanks Ivan,

As you specified, the float charge voltage should be:

Float-charge voltage per cell: 2.23 (gel), 2.32 (flooded), 2.25(AGM).

At what temperature are those voltages valid?

What is the recommended top charge voltage for gel, flooded, and agm batteries?

I have heard that temperature compensation helps prevent overcharging, particularly when a battery undergoes wide temperature changes while being charged. How much should the charging voltage be adjusted pr. °C for each cell?

Sorry for all the questions....

 

 

 

eetcowie
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Re: Charging
eetcowie   1/17/2014 9:54:24 AM
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"...Float-charge voltage per cell: 2.23 (gel), 2.32 (flooded), 2.25(AGM).
At what temperature are those voltages valid?
What is the recommended top charge voltage for gel, flooded, and agm batteries?
I have heard that temperature compensation helps prevent overcharging, particularly when a battery undergoes wide temperature changes while being charged. How much should the charging voltage be adjusted pr. °C for each cell?"

See the text and different tables here: www.powerstream.com/SLA.htm

--enjoy

eetcowie
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Blogger
Lead ain't Dead, yet
eetcowie   1/17/2014 10:33:06 AM
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In keeping up to date, I ran across this piece of industry news from www.powerpulse.net:

To address the impact of Partial State of Charge (PSOC) on cycling batteries in renewable energy (RE), inverter backup and telecom applications, Trojan Battery Co. today announced the addition of Smart Carbon™ as a standard feature to its Industrial and Premium flooded battery lines. Smart Carbon is a proprietary Trojan formula which provides improved performance when the batteries operate in PSOC, enhancing overall battery life in off-grid and unstable grid applications where the batteries are under charged on a regular basis. Along with increased life in a partial state of charge, Trojan's Smart Carbon proprietary formula also provides improved charge acceptance and faster recharge in PSOC applications.
http://www.powerpulse.net/story.php?storyID=29173

I have no affiliation to the news journal or to any battery companies. I just pass along possibly useful info. Some of you have been wondering about additives, so here is yet another.

--enjoy

antedeluvian
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Blogger
Planet Analog
antedeluvian   1/17/2014 10:55:02 AM
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There is a discussion on lead-acid batteries going on on the Planet Analog forum. I will cross post to here.

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