[Electric Boats] Re: How Do you calculate State Of Charge, from charging amps and hours?

 

I assume we are talking here about lead acid.

That's a very good question, and most likely will take a physicist and a chemist working together to answer it explicitly. 

I would think a good first approximation would be to just use the reverse of discharge:  rate of charge @ peukert exponent.  Think of the battery having a characteristic impedance into which some power is used up as heating.

Then you need to add in a factor for battery temperature as that affects the chemical charging process.  As in charging use battery temp to de-rate the recharge process.

At moderate recharge rates it probably is pretty linear though and you only would need to consider all the above at high charge rates.

Of course the best practice is to always completely recharge, monitor the rate at which the battery is accepting charge and terminate when that becomes a constant minimum value (typically a couple of amps or less). Then reset your "gauge" to "full".

John A.

--

Flatwater Electronics
www.flatwaterfarm.com
"Neurosurgery for computer looms."

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Posted by: John Acord <jcacord@gmail.com>

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