Hybrid Car – More Fun with Less Gas

opinions on my off-grid system - Page 7

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Posted by mike on January 11, 2014, 6:50 pm
 
On 1/11/2014 8:47 AM, Jim Wilkins wrote:


I was gonna stuff a square wave into the load fixture and
measure the battery voltage steps on a scope.
I've found that to be a decent measure of resistance.
Doesn't get obscured by all the other battery voltage effects.

Your suggestion is a good one because it more accurately represents
the behavior under specific conditions measured.


Posted by clare on January 11, 2014, 5:56 pm
 


  There is NO WAY UNDER THE SUN that using a mixture of magnesium
sulphate and water  as a replacement for sulphuric acid  as eletrolyte
in a lead acid battery will yeild an operational battery.

Posted by mike on January 11, 2014, 6:46 pm
 On 1/11/2014 9:56 AM, clare@snyder.on.ca wrote:


That was my take on the whole thing.
But, someone appeared to have posted the recipe that worked for them.
Just waitin' for them to pop up with the claim.
Takes far less effort to do the experiment than to enter a pissing contest
about it here.
The battery has been sittin in the shed for several years waiting for
me to empty the electrolyte and recycle it anyway.

Posted by Jim Rojas on January 11, 2014, 7:12 pm
 mike wrote:

Yes. I see your point. I would just try the epson salt method, and see  
if your battery is restored. It will at least clean out your old  
battery. I don't see how a electric desulfication will work at all. You  
are trying to remove build up from a chemical reaction.

After the 3 day trickle charge, drain the battery down, drain the  
liquids, then add the recommend amount of battery acid and distilled  
water. You can then do another 3 day 2 amp trickle charge.

Jim Rojas


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Posted by Jim Wilkins on January 11, 2014, 8:07 pm
 
Lead sulfate is the normal product of discharge, and recharging  
converts it back to lead and lead dioxide.
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/leadacid.html  

PbSO4 is only a problem when it recrystallizes into a more stable,  
less reactive form:
http://batteryuniversity.com/learn/article/sulfation_and_how_to_prevent_it  
"During prolonged charge deprivation, however, the amorphous lead  
sulfate converts to a stable crystalline that deposits on the negative  
plates. This leads to the development of large crystals, which reduce  
the battery's active material that is responsible for high capacity  
and low resistance."

The next paragraph describes the overcharging process I use. Sometimes  
it raises the specific gravity of the electrolyte, showing that solid  
lead sulfate has been reconverted to liquid sulfuric acid, sometimes  
it doesn't. I think monitoring the specific gravity is the best quick  
way to tell if you are really desulfating the battery, and when it's  
gone as far as it can.
jsw




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