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Lead Acid Battery Behaviour

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M.Rehan

M.Rehan

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Can someone provide reference material for Lead Acid Battery for Charging Current Vs Voltage Vs State of Charge


Similar to
http://www.arttec.net/Solar_Mower/4_Electrical/Battery Charging.pdf


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it shows only Voltage VS state of charge

I need Voltage Vs Charging/Discharging Current Vs State of Charge
 

These are process dependent and graph from one manufacturer cannot be used for charging /discharging measurements on another battery from another manufacturer.
 

I don't understand the question. The article gives charge and discharge curves for different currents. What do you want else?
Do you understand the meaning of the current unit (e.g. C/5)?

Charging voltages above 15V suggests that the diagram is referring to standard non-sealed ("flooded") lead-acid batteries, e.g. car batteries. They could be applicable to a large range of similar batteries, I didn't check the published curves.
 

FvM said:
The article gives charge and discharge curves for different currents. What do you want else?
Click to expand...

If C10 battery is charged within 5 hours will it follow C5 curve?
Thats why I need State of charge VS Voltage Vs Current
 
it sounds like you want to know how much current you can shovel in to a given lead battery with unknown charge state.......just shovel in your max accepted charge curent that is safe to do so under temperature considerations..........when you get to the max allowabel voltage.....keep gradually tapering the current down so as to keep the batt at that voltage....eventually the current will drop away to very little needed to keep that voltage.

Everybody always wants to measure the voltage across a battery and know exactly the state of charge, but it is not so simple.
 
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    M.Rehan

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If C10 battery is charged within 5 hours will it follow C5 curve?
Click to expand...
Looks like you don't understand the meaning of C/xx ratings. There's no thing like a "C10" battery.

Nevertheless you can derive the intended curves from the given ones (as an estimation, by interpolating current values etc.)
 

treez said:
Everybody always wants to measure the voltage across a battery and know exactly the state of charge, but it is not so simple.
Click to expand...
Then what is Simple and practical method for measuring state of charge During charging and Discharging



FvM said:
Looks like you don't understand the meaning of C/xx ratings.
Click to expand...

C/xx rating shows how much time is required to fully charge and discharge a battery under ideal conditions

FvM said:
Nevertheless you can derive the intended curves from the given ones (as an estimation, by interpolating current values etc.)
Click to expand...

Is it practical to use these curves for charge estimation
 
Is it practical to use these curves for charge estimation
Click to expand...
Yes, if you don't have better ones.

You can translate C/xx to actual current by putting in your battery capacitance in Ah. Then turn the diagrams by 90 degree and get a a charging state versus battery voltage diagram with charge/discharge current as parameter.

As treez mentioned, determining charging state only from instantaneous voltage and current gives rather limited accuracy. Exact charge monitoring will integrate the current.
 
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