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Author Topic: Lead Acid Battery Desulfator Project  (Read 11603 times)
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Thunderbird
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« Reply #15 on: January 21, 2013, 06:46:18 PM »

I put the parts I bought for a new improved desulfator somewhere safe, and now I cant find them... when I do, I'll get back onto it.  tongue3 Going to make the new version modular, with the low voltage and high voltage parts on separate boards for ease of testing and changes during beta testing. Stay tuned.  Smoking
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« Reply #16 on: January 21, 2013, 06:57:53 PM »

Stay tuned.  Smoking

Marget that  Boobs
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« Reply #17 on: September 06, 2013, 06:41:40 PM »

I've got an old battery that died on me recently.. Wanna give it a burl?  Feel free to keep it for your experimentationszs
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« Reply #18 on: September 08, 2013, 06:20:38 PM »

An old and recently deceased battery would be cool to test the desulfators on.
 Grandpa
 Wood Chopping
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Reply #18 on: September 08, 2013, 06:20:38 PM

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« Reply #19 on: April 22, 2015, 07:48:10 PM »

<a href="http://www.youtube.com/watch?v=mD8aGqANnho" target="_blank" class="aeva_link bbc_link new_win">Sealed Lead Acid (SLA) Recovery Tips</a>


About bloody time I made a new video Jack can pause on icon_bounce

Sad news first -- my 100 amp deep cycle is on it's way to the big recycling plant in the sky.

Good news - that near dead 12v 20AH SLA I got off you on Friday is coming along, Chopper  Wood Chopping

After some unorthodox Cootering, the stand-by voltage has gone from 3v to 12.3v  sunny

They say the battery stand-by when new should be 13.5v to 13.8v

I'll whack your MegaPulse desulfator on this patient for a few weeks and see if the stand-by picks up.

It would be cool if gets up to at least 13v. ( I not expecting brand new results from old stuff  Grandpa )

 Smoking
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Thunderbird
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« Reply #20 on: April 22, 2015, 10:18:52 PM »

Very interesting results there.

Try an old car head light bulb as a load for the batteries, if you don't have one remind me to give you one, I keep a couple lying around that have the low beam buggered just as load testers etc.

Bugger about the big battery.

Ill have to scratch around in my shed I think I've got a couple of old UPS's lying in there with SLA batteries in them to play with.


 Grandpa Wood Chopping
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« Reply #21 on: April 23, 2015, 04:22:55 PM »

Yeah pull those UPS's apart  toothy3
 
There's a dude in Southport that sells the same 20ah battery's for $40 new, but playing with old dead ones is more fun.  Cool Chicken

I left one of those LED (about 300mah) lights on last night and got over
12 hours before turning it off at about 5am this morning. (was up all night bit pissed)

Started at 12.3v and finished about 11.6v

My charge control turns off at 11.4v

It's not going to start a car, but works well enough to run the shed lights

It's all up to the desulfator (been on all day) now if any increase is going to happen.

When the sun goes out tonight I'm fingers crosses a float a bit higher than 12.3 happens.

 Rocking dang hang over dot com
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« Reply #22 on: April 24, 2015, 01:09:28 PM »

I ran a better load test last night...

1 amp draw (from 3 LED lights) ran the lights for 3 hours 30 minutes on the dot.

Starting voltage: 12.3v
End voltage       : 11.4v (charge controller cut off)

3.5 amp hours from an otherwise rooted 18 amp hour,
or 1/5 the original capacity, is about the same ratio
as my other 'recovered' SLA's

So I have to conceded, using 'recovered' in the same sentence as old SLA's,
is still a tall stretch until the desulfator comes to the party as well.

 Smoking
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« Reply #23 on: April 24, 2015, 01:43:19 PM »

Sounds good to me.

But often is not quite that easy to calculate a battery's performance as most amp hour ratings are based on the 20 hour amp hour.

http://all-about-lead-acid-batteries.capnfatz.com/all-about-lead-acid-batteries/lead-acid-battery-fundamentals/what-are-amp-hours/

Still ANY amp hours out of an otherwise cactus battery is good stuff.

 Grandpa Wood Chopping
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« Reply #24 on: April 24, 2015, 02:36:12 PM »


Ow, I see now the standard testing discharge minimum is 10.5v - that's better news.

On such a test, the subject would run much longer than 3.5 hours without
my over concerned control charger kicking early.

At a guess the 3.5 hours @ 1 amp draw cut off at 11.5v will now do about 6 or 7 hours of 1 amp draw when cut off at 10.5v

I'll put my theory to the test.

 happy8
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« Reply #25 on: May 31, 2015, 12:04:23 PM »

Got a new Altronics catalog at the Brisbane Hamfest.

Look what's inside, there's 3 models of them.

http://www.altronics.com.au/p/m8540-12v-under-70ah-lead-acid-battery-desulfator/

 Grandpa Wood Chopping
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« Reply #26 on: May 31, 2015, 04:42:54 PM »

For about the same price I was thinking about one of these chargers with a desulfator built in..

http://www.ebay.com.au/itm/6V-12v-battery-smart-trickle-charger-Ultipower-1A-2A-3A-and-4A-Adjust-Current-/291456663247?

or..

http://www.ebay.com.au/itm/181634255830

Your one I've been borrowing seems to be working on an old puffy ended car battery I found in the shed and am using for the lights at night.

Trouble is it only works during the day when the solar panel keeps the charge over the required 12.8v to get it to turn on  tard

Your home made ones would be better than those ones online?

The SLA has been sitting on the shelf for a few weeks but still holding up around 12v

 Grandpa
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« Reply #27 on: December 31, 2015, 02:19:44 PM »



Finally took delivery of the "Infinitum battery desulfator" yesterday. (bloody eBay tricked me on the US vs AU price)

First test bunny is a sealed lead acid with bugger all amps, but will happily sit at 12.4v for weeks, but won't fully charge.

The inbuilt battery indicator is green which supposedly means it's OK - no bulging ends from sulfuration.

Starting charge voltage is 13.08v



If / when the red goes green on the charger, I'll stop bitching about the $40 price.

 Doctor
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« Reply #28 on: December 31, 2015, 02:38:23 PM »

When you get tired of trying to resuscitate your old/dead/cactus/fucked car batteries I will pay $4 for each of them big or small    Doctor

They will be recycled responsibly the way mother nature intended (or so Im told)

 wave

Can get a pretty good deal on new ones too if anyone is interested
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« Reply #29 on: December 31, 2015, 02:45:35 PM »

$4?  Crazy

Sarges scrap do about $10  kermit

 Cool Chicken
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